D7net
Home
Console
Upload
information
Create File
Create Folder
About
Tools
:
/
opt
/
cpanel
/
ea-tomcat85
/
webapps
/
docs
/
config
/
Filename :
http.html
back
Copy
<!DOCTYPE html SYSTEM "about:legacy-compat"> <html lang="en"><head><META http-equiv="Content-Type" content="text/html; charset=UTF-8"><link href="../images/docs-stylesheet.css" rel="stylesheet" type="text/css"><title>Apache Tomcat 8 Configuration Reference (8.5.100) - The HTTP Connector</title><meta name="author" content="Craig R. McClanahan"><meta name="author" content="Yoav Shapira"></head><body><div id="wrapper"><header><div id="header"><div><div><div class="logo noPrint"><a href="https://tomcat.apache.org/"><img alt="Tomcat Home" src="../images/tomcat.png"></a></div><div style="height: 1px;"></div><div class="asfLogo noPrint"><a href="https://www.apache.org/" target="_blank"><img src="../images/asf-logo.svg" alt="The Apache Software Foundation" style="width: 266px; height: 83px;"></a></div><h1>Apache Tomcat 8 Configuration Reference</h1><div class="versionInfo"> Version 8.5.100, <time datetime="2024-03-19">Mar 19 2024</time></div><div style="height: 1px;"></div><div style="clear: left;"></div></div></div></div></header><div id="middle"><div><div id="mainLeft" class="noprint"><div><nav><div><h2>Links</h2><ul><li><a href="../index.html">Docs Home</a></li><li><a href="index.html">Config Ref. Home</a></li><li><a href="https://cwiki.apache.org/confluence/display/TOMCAT/FAQ">FAQ</a></li><li><a href="#comments_section">User Comments</a></li></ul></div><div><h2>Top Level Elements</h2><ul><li><a href="server.html">Server</a></li><li><a href="service.html">Service</a></li></ul></div><div><h2>Executors</h2><ul><li><a href="executor.html">Executor</a></li></ul></div><div><h2>Connectors</h2><ul><li><a href="http.html">HTTP/1.1</a></li><li><a href="http2.html">HTTP/2</a></li><li><a href="ajp.html">AJP</a></li></ul></div><div><h2>Containers</h2><ul><li><a href="context.html">Context</a></li><li><a href="engine.html">Engine</a></li><li><a href="host.html">Host</a></li><li><a href="cluster.html">Cluster</a></li></ul></div><div><h2>Nested Components</h2><ul><li><a href="cookie-processor.html">CookieProcessor</a></li><li><a href="credentialhandler.html">CredentialHandler</a></li><li><a href="globalresources.html">Global Resources</a></li><li><a href="jar-scanner.html">JarScanner</a></li><li><a href="jar-scan-filter.html">JarScanFilter</a></li><li><a href="listeners.html">Listeners</a></li><li><a href="loader.html">Loader</a></li><li><a href="manager.html">Manager</a></li><li><a href="realm.html">Realm</a></li><li><a href="resources.html">Resources</a></li><li><a href="sessionidgenerator.html">SessionIdGenerator</a></li><li><a href="valve.html">Valve</a></li></ul></div><div><h2>Cluster Elements</h2><ul><li><a href="cluster.html">Cluster</a></li><li><a href="cluster-manager.html">Manager</a></li><li><a href="cluster-channel.html">Channel</a></li><li><a href="cluster-membership.html">Channel/Membership</a></li><li><a href="cluster-sender.html">Channel/Sender</a></li><li><a href="cluster-receiver.html">Channel/Receiver</a></li><li><a href="cluster-interceptor.html">Channel/Interceptor</a></li><li><a href="cluster-valve.html">Valve</a></li><li><a href="cluster-deployer.html">Deployer</a></li><li><a href="cluster-listener.html">ClusterListener</a></li></ul></div><div><h2>web.xml</h2><ul><li><a href="filter.html">Filter</a></li></ul></div><div><h2>Other</h2><ul><li><a href="systemprops.html">System properties</a></li><li><a href="jaspic.html">JASPIC</a></li></ul></div></nav></div></div><div id="mainRight"><div id="content"><h2>The HTTP Connector</h2><h3 id="Table_of_Contents">Table of Contents</h3><div class="text"> <ul><li><a href="#Introduction">Introduction</a></li><li><a href="#Attributes">Attributes</a><ol><li><a href="#Common_Attributes">Common Attributes</a></li><li><a href="#Standard_Implementation">Standard Implementation</a></li><li><a href="#Java_TCP_socket_attributes">Java TCP socket attributes</a></li><li><a href="#NIO_specific_configuration">NIO specific configuration</a></li><li><a href="#NIO2_specific_configuration">NIO2 specific configuration</a></li><li><a href="#APR/native_specific_configuration">APR/native specific configuration</a></li></ol></li><li><a href="#Nested_Components">Nested Components</a></li><li><a href="#Special_Features">Special Features</a><ol><li><a href="#HTTP/1.1_and_HTTP/1.0_Support">HTTP/1.1 and HTTP/1.0 Support</a></li><li><a href="#HTTP/2_Support">HTTP/2 Support</a></li><li><a href="#Proxy_Support">Proxy Support</a></li><li><a href="#SSL_Support">SSL Support</a></li><li><a href="#SSL_Support_-_SSLHostConfig">SSL Support - SSLHostConfig</a></li><li><a href="#SSL_Support_-_Certificate">SSL Support - Certificate</a></li><li><a href="#SSL_Support_-_Connector_-_NIO_and_NIO2">SSL Support - Connector - NIO and NIO2</a></li><li><a href="#SSL_Support_-_OpenSSL's_SSL_CONF_API">SSL Support - OpenSSL's SSL_CONF API</a></li><li><a href="#Key_store_types">Key store types</a></li><li><a href="#SSL_Support_-_Connector_-_NIO_and_NIO2_(deprecated)">SSL Support - Connector - NIO and NIO2 (deprecated)</a></li><li><a href="#SSL_Support_-_Connector_-_APR/Native_(deprecated)">SSL Support - Connector - APR/Native (deprecated)</a></li><li><a href="#Connector_Comparison">Connector Comparison</a></li></ol></li></ul> </div><h3 id="Introduction">Introduction</h3><div class="text"> <p>The <strong>HTTP Connector</strong> element represents a <strong>Connector</strong> component that supports the HTTP/1.1 protocol. It enables Catalina to function as a stand-alone web server, in addition to its ability to execute servlets and JSP pages. A particular instance of this component listens for connections on a specific TCP port number on the server. One or more such <strong>Connectors</strong> can be configured as part of a single <a href="service.html">Service</a>, each forwarding to the associated <a href="engine.html">Engine</a> to perform request processing and create the response.</p> <p>If you wish to configure the <strong>Connector</strong> that is used for connections to web servers using the AJP protocol (such as the <code>mod_jk 1.2.x</code> connector for Apache 1.3), please refer to the <a href="ajp.html">AJP Connector</a> documentation.</p> <p>Each incoming, non-asynchronous request requires a thread for the duration of that request. If more simultaneous requests are received than can be handled by the currently available request processing threads, additional threads will be created up to the configured maximum (the value of the <code>maxThreads</code> attribute). If still more simultaneous requests are received, Tomcat will accept new connections until the current number of connections reaches <code>maxConnections</code>. Connections are queued inside the server socket created by the <strong>Connector</strong> until a thread becomes available to process the connection. Once <code>maxConnections</code> has been reached the operating system will queue further connections. The size of the operating system provided connection queue may be controlled by the <code>acceptCount</code> attribute. If the operating system queue fills, further connection requests may be refused or may time out.</p> </div><h3 id="Attributes">Attributes</h3><div class="text"> <div class="subsection"><h4 id="Common_Attributes">Common Attributes</h4><div class="text"> <p>All implementations of <strong>Connector</strong> support the following attributes:</p> <table class="defaultTable"><tr><th style="width: 15%;"> Attribute </th><th style="width: 85%;"> Description </th></tr><tr><td><code class="attributeName">allowTrace</code></td><td> <p>A boolean value which can be used to enable or disable the TRACE HTTP method. If not specified, this attribute is set to false.</p> </td></tr><tr><td><code class="attributeName">asyncTimeout</code></td><td> <p>The default timeout for asynchronous requests in milliseconds. If not specified, this attribute is set to the Servlet specification default of 30000 (30 seconds).</p> </td></tr><tr><td><code class="attributeName">discardFacades</code></td><td> <p>A boolean value which can be used to enable or disable the recycling of the facade objects that isolate the container internal request processing objects. If set to <code>true</code> the facades will be set for garbage collection after every request, otherwise they will be reused. This setting has no effect when the security manager is enabled. If not specified, this attribute is set to the value of the <code>org.apache.catalina.connector.RECYCLE_FACADES</code> system property, or <code>false</code> if not set.</p> </td></tr><tr><td><code class="attributeName">enableLookups</code></td><td> <p>Set to <code>true</code> if you want calls to <code>request.getRemoteHost()</code> to perform DNS lookups in order to return the actual host name of the remote client. Set to <code>false</code> to skip the DNS lookup and return the IP address in String form instead (thereby improving performance). By default, DNS lookups are disabled.</p> </td></tr><tr><td><code class="attributeName">encodedSolidusHandling</code></td><td> <p>When set to <code>reject</code> request paths containing a <code>%2f</code> sequence will be rejected with a 400 response. When set to <code>decode</code> request paths containing a <code>%2f</code> sequence will have that sequence decoded to <code>/</code> at the same time other <code>%nn</code> sequences are decoded. When set to <code>passthrough</code> request paths containing a <code>%2f</code> sequence will be processed with the <code>%2f</code> sequence unchanged. If not specified the default value is <code>reject</code>. This default may be modified if the deprecated <a href="systemprops.html">system property</a> <code>org.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH</code> is set.</p> </td></tr><tr><td><code class="attributeName">maxCookieCount</code></td><td> <p>The maximum number of cookies that are permitted for a request. A value of less than zero means no limit. If not specified, a default value of 200 will be used.</p> </td></tr><tr><td><code class="attributeName">maxParameterCount</code></td><td> <p>The maximum total number of request parameters (including uploaded files) obtained from the query string and, for POST requests, the request body if the content type is <code>application/x-www-form-urlencoded</code> or <code>multipart/form-data</code>. Request parameters beyond this limit will be ignored. A value of less than 0 means no limit. If not specified, a default of 10000 is used. Note that <code>FailedRequestFilter</code> <a href="filter.html">filter</a> can be used to reject requests that exceed the limit.</p> </td></tr><tr><td><code class="attributeName">maxPostSize</code></td><td> <p>The maximum size in bytes of the POST which will be handled by the container FORM URL parameter parsing. The limit can be disabled by setting this attribute to a value less than zero. If not specified, this attribute is set to 2097152 (2 MiB). Note that the <a href="filter.html#Failed_Request_Filter"><code>FailedRequestFilter</code></a> can be used to reject requests that exceed this limit.</p> </td></tr><tr><td><code class="attributeName">maxSavePostSize</code></td><td> <p>The maximum size in bytes of the request body which will be saved/buffered by the container during FORM or CLIENT-CERT authentication or during HTTP/1.1 upgrade. For both types of authentication, the request body will be saved/buffered before the user is authenticated. For CLIENT-CERT authentication, the request body is buffered for the duration of the SSL handshake and the buffer emptied when the request is processed. For FORM authentication the POST is saved whilst the user is re-directed to the login form and is retained until the user successfully authenticates or the session associated with the authentication request expires. For HTTP/1.1 upgrade, the request body is buffered for the duration of the upgrade process. The limit can be disabled by setting this attribute to -1. Setting the attribute to zero will disable the saving of the request body data during authentication and HTTP/1.1 upgrade. If not specified, this attribute is set to 4096 (4 kilobytes).</p> </td></tr><tr><td><code class="attributeName">parseBodyMethods</code></td><td> <p>A comma-separated list of HTTP methods for which request bodies using <code>application/x-www-form-urlencoded</code> will be parsed for request parameters identically to POST. This is useful in RESTful applications that want to support POST-style semantics for PUT requests. Note that any setting other than <code>POST</code> causes Tomcat to behave in a way that goes against the intent of the servlet specification. The HTTP method TRACE is specifically forbidden here in accordance with the HTTP specification. The default is <code>POST</code></p> </td></tr><tr><td><strong><code class="attributeName">port</code></strong></td><td> <p>The TCP port number on which this <strong>Connector</strong> will create a server socket and await incoming connections. Your operating system will allow only one server application to listen to a particular port number on a particular IP address. If the special value of 0 (zero) is used, then Tomcat will select a free port at random to use for this connector. This is typically only useful in embedded and testing applications.</p> </td></tr><tr><td><code class="attributeName">protocol</code></td><td> <p>Sets the protocol to handle incoming traffic. The default value is <code>HTTP/1.1</code> which uses an auto-switching mechanism to select either a Java NIO based connector or an APR/native based connector. If the <code>PATH</code> (Windows) or <code>LD_LIBRARY_PATH</code> (on most unix systems) environment variables contain the Tomcat native library, and the <code>AprLifecycleListener</code> that is used to initialize APR has its <code>useAprConnector</code> attribute set to <code>true</code>, the APR/native connector will be used. If the native library cannot be found or the attribute is not configured, the Java NIO based connector will be used. Note that the APR/native connector has different settings for HTTPS than the Java connectors.<br> To use an explicit protocol rather than rely on the auto-switching mechanism described above, the following values may be used:<br> <code>org.apache.coyote.http11.Http11NioProtocol</code> - non blocking Java NIO connector<br> <code>org.apache.coyote.http11.Http11Nio2Protocol</code> - non blocking Java NIO2 connector<br> <code>org.apache.coyote.http11.Http11AprProtocol</code> - the APR/native connector.<br> Custom implementations may also be used.<br> Take a look at our <a href="#Connector_Comparison">Connector Comparison</a> chart. The configuration for both Java connectors is identical, for http and https.<br> For more information on the APR connector and APR specific SSL settings please visit the <a href="../apr.html">APR documentation</a> </p> </td></tr><tr><td><code class="attributeName">proxyName</code></td><td> <p>If this <strong>Connector</strong> is being used in a proxy configuration, configure this attribute to specify the server name to be returned for calls to <code>request.getServerName()</code>. See <a href="#Proxy_Support">Proxy Support</a> for more information.</p> </td></tr><tr><td><code class="attributeName">proxyPort</code></td><td> <p>If this <strong>Connector</strong> is being used in a proxy configuration, configure this attribute to specify the server port to be returned for calls to <code>request.getServerPort()</code>. See <a href="#Proxy_Support">Proxy Support</a> for more information.</p> </td></tr><tr><td><code class="attributeName">redirectPort</code></td><td> <p>If this <strong>Connector</strong> is supporting non-SSL requests, and a request is received for which a matching <code><security-constraint></code> requires SSL transport, Catalina will automatically redirect the request to the port number specified here.</p> </td></tr><tr><td><code class="attributeName">scheme</code></td><td> <p>Set this attribute to the name of the protocol you wish to have returned by calls to <code>request.getScheme()</code>. For example, you would set this attribute to "<code>https</code>" for an SSL Connector. The default value is "<code>http</code>". </p> </td></tr><tr><td><code class="attributeName">secure</code></td><td> <p>Set this attribute to <code>true</code> if you wish to have calls to <code>request.isSecure()</code> to return <code>true</code> for requests received by this Connector. You would want this on an SSL Connector or a non SSL connector that is receiving data from a SSL accelerator, like a crypto card, an SSL appliance or even a webserver. The default value is <code>false</code>.</p> </td></tr><tr><td><code class="attributeName">URIEncoding</code></td><td> <p>This specifies the character encoding used to decode the URI bytes, after %xx decoding the URL. If not specified, UTF-8 will be used unless the <code>org.apache.catalina.STRICT_SERVLET_COMPLIANCE</code> <a href="systemprops.html">system property</a> is set to <code>true</code> in which case ISO-8859-1 will be used.</p> </td></tr><tr><td><code class="attributeName">useBodyEncodingForURI</code></td><td> <p>This specifies if the encoding specified in contentType should be used for URI query parameters, instead of using the URIEncoding. This setting is present for compatibility with Tomcat 4.1.x, where the encoding specified in the contentType, or explicitly set using Request.setCharacterEncoding method was also used for the parameters from the URL. The default value is <code>false</code>. </p> <p><strong>Notes:</strong> 1) This setting is applied only to the query string of a request. Unlike <code>URIEncoding</code> it does not affect the path portion of a request URI. 2) If request character encoding is not known (is not provided by a browser and is not set by <code>SetCharacterEncodingFilter</code> or a similar filter using Request.setCharacterEncoding method), the default encoding is always "ISO-8859-1". The <code>URIEncoding</code> setting has no effect on this default. </p> </td></tr><tr><td><code class="attributeName">useIPVHosts</code></td><td> <p>Set this attribute to <code>true</code> to cause Tomcat to use the IP address that the request was received on to determine the Host to send the request to. The default value is <code>false</code>.</p> </td></tr><tr><td><code class="attributeName">xpoweredBy</code></td><td> <p>Set this attribute to <code>true</code> to cause Tomcat to advertise support for the Servlet specification using the header recommended in the specification. The default value is <code>false</code>.</p> </td></tr></table> </div></div> <div class="subsection"><h4 id="Standard_Implementation">Standard Implementation</h4><div class="text"> <p>The standard HTTP connectors (NIO, NIO2 and APR/native) all support the following attributes in addition to the common Connector attributes listed above.</p> <table class="defaultTable"><tr><th style="width: 15%;"> Attribute </th><th style="width: 85%;"> Description </th></tr><tr><td><code class="attributeName">acceptCount</code></td><td> <p>The maximum length of the operating system provided queue for incoming connection requests when <code>maxConnections</code> has been reached. The operating system may ignore this setting and use a different size for the queue. When this queue is full, the operating system may actively refuse additional connections or those connections may time out. The default value is 100.</p> </td></tr><tr><td><code class="attributeName">acceptorThreadPriority</code></td><td> <p>The priority of the acceptor thread. The thread used to accept new connections. The default value is <code>5</code> (the value of the <code>java.lang.Thread.NORM_PRIORITY</code> constant). See the JavaDoc for the <code>java.lang.Thread</code> class for more details on what this priority means.</p> </td></tr><tr><td><code class="attributeName">address</code></td><td> <p>For servers with more than one IP address, this attribute specifies which address will be used for listening on the specified port. By default, the connector will listen all local addresses. Unless the JVM is configured otherwise using system properties, the Java based connectors (NIO, NIO2) will listen on both IPv4 and IPv6 addresses when configured with either <code>0.0.0.0</code> or <code>::</code>. The APR/native connector will only listen on IPv4 addresses if configured with <code>0.0.0.0</code> and will listen on IPv6 addresses (and optionally IPv4 addresses depending on the setting of <strong>ipv6v6only</strong>) if configured with <code>::</code>.</p> </td></tr><tr><td><code class="attributeName">allowHostHeaderMismatch</code></td><td> <p>By default Tomcat will reject requests that specify a host in the request line but specify a different host in the host header. This check can be disabled by setting this attribute to <code>true</code>. If not specified, the default is <code>false</code>. <br> This setting will be removed in Tomcat 11 onwards where it will be hard-coded to <code>false</code>.</p> </td></tr><tr><td><code class="attributeName">allowedTrailerHeaders</code></td><td> <p>By default Tomcat will ignore all trailer headers when processing chunked input. For a header to be processed, it must be added to this comma-separated list of header names.</p> </td></tr><tr><td><code class="attributeName">bindOnInit</code></td><td> <p>Controls when the socket used by the connector is bound. If set to <code>true</code> it is bound when the connector is initiated and unbound when the connector is destroyed. If set to <code>false</code>, the socket will be bound when the connector is started and unbound when it is stopped. If not specified, the default is <code>true</code>.</p> </td></tr><tr><td><code class="attributeName">clientCertProvider</code></td><td> <p>When client certificate information is presented in a form other than instances of <code>java.security.cert.X509Certificate</code> it needs to be converted before it can be used and this property controls which JSSE provider is used to perform the conversion. For example it is used with the <a href="ajp.html">AJP connectors</a>, the HTTP APR connector and with the <a href="valve.html#SSL_Authenticator_Valve"> org.apache.catalina.valves.SSLValve</a>. If not specified, the default provider will be used.</p> </td></tr><tr><td><code class="attributeName">compressibleMimeType</code></td><td> <p>The value is a comma separated list of MIME types for which HTTP compression may be used. The default value is <code> text/html,text/xml,text/plain,text/css,text/javascript,application/javascript,application/json,application/xml </code>. If you specify a type explicitly, the default is over-ridden.</p> </td></tr><tr><td><code class="attributeName">compression</code></td><td> <p>The <strong>Connector</strong> may use HTTP/1.1 GZIP compression in an attempt to save server bandwidth. The acceptable values for the parameter is "off" (disable compression), "on" (allow compression, which causes text data to be compressed), "force" (forces compression in all cases), or a numerical integer value (which is equivalent to "on", but specifies the minimum amount of data before the output is compressed). If the content-length is not known and compression is set to "on" or more aggressive, the output will also be compressed. If not specified, this attribute is set to "off".</p> <p><em>Note</em>: There is a tradeoff between using compression (saving your bandwidth) and using the sendfile feature (saving your CPU cycles). If the connector supports the sendfile feature, e.g. the NIO connector, using sendfile will take precedence over compression. The symptoms will be that static files greater that 48 KiB will be sent uncompressed. You can turn off sendfile by setting <code>useSendfile</code> attribute of the connector, as documented below, or change the sendfile usage threshold in the configuration of the <a href="../default-servlet.html">DefaultServlet</a> in the default <code>conf/web.xml</code> or in the <code>web.xml</code> of your web application. </p> </td></tr><tr><td><code class="attributeName">compressionMinSize</code></td><td> <p>If <strong>compression</strong> is set to "on" then this attribute may be used to specify the minimum amount of data before the output is compressed. If not specified, this attribute is defaults to "2048". Units are in bytes.</p> </td></tr><tr><td><code class="attributeName">connectionLinger</code></td><td> <p>The number of seconds during which the sockets used by this <strong>Connector</strong> will linger when they are closed. The default value is <code>-1</code> which disables socket linger.</p> </td></tr><tr><td><code class="attributeName">connectionTimeout</code></td><td> <p>The number of milliseconds this <strong>Connector</strong> will wait, after accepting a connection, for the request URI line to be presented. Use a value of -1 to indicate no (i.e. infinite) timeout. The default value is 60000 (i.e. 60 seconds) but note that the standard server.xml that ships with Tomcat sets this to 20000 (i.e. 20 seconds). Unless <strong>disableUploadTimeout</strong> is set to <code>false</code>, this timeout will also be used when reading the request body (if any).</p> </td></tr><tr><td><code class="attributeName">connectionUploadTimeout</code></td><td> <p>Specifies the timeout, in milliseconds, to use while a data upload is in progress. This only takes effect if <strong>disableUploadTimeout</strong> is set to <code>false</code>. </p> </td></tr><tr><td><code class="attributeName">continueResponseTiming</code></td><td> <p>When to respond with a <code>100</code> intermediate response code to a request containing an <code>Expect: 100-continue</code> header. The following values may used: <ul> <li><code>immediately</code> - an intermediate 100 status response will be returned as soon as practical</li> <li><code>onRead</code> - an intermediate 100 status response will be returned only when the Servlet reads the request body, allowing the servlet to inspect the headers and possibly respond before the user agent sends a possibly large request body.</li> </ul> </p> </td></tr><tr><td><code class="attributeName">defaultSSLHostConfigName</code></td><td> <p>The name of the default <strong>SSLHostConfig</strong> that will be used for secure connections (if this connector is configured for secure connections) if the client connection does not provide SNI or if the SNI is provided but does not match any configured <strong>SSLHostConfig</strong>. If not specified the default value of <code>_default_</code> will be used. Provided values are always converted to lower case.</p> </td></tr><tr><td><code class="attributeName">disableUploadTimeout</code></td><td> <p>This flag allows the servlet container to use a different, usually longer connection timeout during data upload. If not specified, this attribute is set to <code>true</code> which disables this longer timeout. </p> </td></tr><tr><td><code class="attributeName">executor</code></td><td> <p>A reference to the name in an <a href="executor.html">Executor</a> element. If this attribute is set, and the named executor exists, the connector will use the executor, and all the other thread attributes will be ignored. Note that if a shared executor is not specified for a connector then the connector will use a private, internal executor to provide the thread pool.</p> </td></tr><tr><td><code class="attributeName">executorTerminationTimeoutMillis</code></td><td> <p>The time that the private internal executor will wait for request processing threads to terminate before continuing with the process of stopping the connector. If not set, the default is <code>5000</code> (5 seconds).</p> </td></tr><tr><td><code class="attributeName">keepAliveTimeout</code></td><td> <p>The number of milliseconds this <strong>Connector</strong> will wait for another HTTP request before closing the connection. The default value is to use the value that has been set for the <strong>connectionTimeout</strong> attribute. Use a value of -1 to indicate no (i.e. infinite) timeout.</p> </td></tr><tr><td><code class="attributeName">maxConnections</code></td><td> <p>The maximum number of connections that the server will accept and process at any given time. When this number has been reached, the server will accept, but not process, one further connection. This additional connection be blocked until the number of connections being processed falls below <strong>maxConnections</strong> at which point the server will start accepting and processing new connections again. Note that once the limit has been reached, the operating system may still accept connections based on the <code>acceptCount</code> setting. The default value varies by connector type. For NIO and NIO2 the default is <code>10000</code>. For APR/native, the default is <code>8192</code>.</p> <p>For NIO/NIO2 only, setting the value to -1, will disable the maxConnections feature and connections will not be counted.</p> </td></tr><tr><td><code class="attributeName">maxExtensionSize</code></td><td> <p>Limits the total length of chunk extensions in chunked HTTP requests. If the value is <code>-1</code>, no limit will be imposed. If not specified, the default value of <code>8192</code> will be used.</p> </td></tr><tr><td><code class="attributeName">maxHeaderCount</code></td><td> <p>The maximum number of headers in a request that are allowed by the container. A request that contains more headers than the specified limit will be rejected. A value of less than 0 means no limit. If not specified, a default of 100 is used.</p> </td></tr><tr><td><code class="attributeName">maxHttpHeaderSize</code></td><td> <p>Provides the default value for <strong>maxHttpRequestHeaderSize</strong> and <strong>maxHttpResponseHeaderSize</strong>. If not specified, this attribute is set to 8192 (8 KiB).</p> </td></tr><tr><td><code class="attributeName">maxHttpRequestHeaderSize</code></td><td> <p>The maximum permitted size of the request line and headers associated with an HTTP request, specified in bytes. This is compared to the number of bytes received so includes line terminators and whitespace as well as the request line, header names and header values. If not specified, this attribute is set to the value of the <code>maxHttpHeaderSize</code> attribute.</p> <p>If you see "Request header is too large" errors you can increase this, but be aware that Tomcat will allocate the full amount you specify for every request. For example, if you specify a maxHttpRequestHeaderSize of 1 MB and your application handles 100 concurrent requests, you will see 100 MB of heap consumed by request headers.</p> </td></tr><tr><td><code class="attributeName">maxHttpResponseHeaderSize</code></td><td> <p>The maximum permitted size of the response line and headers associated with an HTTP response, specified in bytes. This is compared to the number of bytes written so includes line terminators and whitespace as well as the status line, header names and header values. If not specified, this attribute is set to the value of the <code>maxHttpHeaderSize</code> attribute.</p> </td></tr><tr><td><code class="attributeName">maxKeepAliveRequests</code></td><td> <p>The maximum number of HTTP requests which can be pipelined until the connection is closed by the server. Setting this attribute to 1 will disable HTTP/1.0 keep-alive, as well as HTTP/1.1 keep-alive and pipelining. Setting this to -1 will allow an unlimited amount of pipelined or keep-alive HTTP requests. If not specified, this attribute is set to 100.</p> </td></tr><tr><td><code class="attributeName">maxSwallowSize</code></td><td> <p>The maximum number of request body bytes (excluding transfer encoding overhead) that will be swallowed by Tomcat for an aborted upload. An aborted upload is when Tomcat knows that the request body is going to be ignored but the client still sends it. If Tomcat does not swallow the body the client is unlikely to see the response. If not specified the default of 2097152 (2 MiB) will be used. A value of less than zero indicates that no limit should be enforced.</p> </td></tr><tr><td><code class="attributeName">maxThreads</code></td><td> <p>The maximum number of request processing threads to be created by this <strong>Connector</strong>, which therefore determines the maximum number of simultaneous requests that can be handled. If not specified, this attribute is set to 200. If an executor is associated with this connector, this attribute is ignored as the connector will execute tasks using the executor rather than an internal thread pool. Note that if an executor is configured any value set for this attribute will be recorded correctly but it will be reported (e.g. via JMX) as <code>-1</code> to make clear that it is not used.</p> </td></tr><tr><td><code class="attributeName">maxTrailerSize</code></td><td> <p>Limits the total length of trailing headers in the last chunk of a chunked HTTP request. If the value is <code>-1</code>, no limit will be imposed. If not specified, the default value of <code>8192</code> will be used.</p> </td></tr><tr><td><code class="attributeName">minSpareThreads</code></td><td> <p>The minimum number of threads always kept running. This includes both active and idle threads. If not specified, the default of <code>10</code> is used. If an executor is associated with this connector, this attribute is ignored as the connector will execute tasks using the executor rather than an internal thread pool. Note that if an executor is configured any value set for this attribute will be recorded correctly but it will be reported (e.g. via JMX) as <code>-1</code> to make clear that it is not used.</p> </td></tr><tr><td><code class="attributeName">noCompressionStrongETag</code></td><td> <p>This flag configures whether resources with a strong ETag will be considered for compression. If <code>true</code>, resources with a strong ETag will not be compressed. The default value is <code>true</code>.</p> <p>This attribute is deprecated. It will be removed in Tomcat 10 onwards where it will be hard-coded to <code>true</code>.</p> </td></tr><tr><td><code class="attributeName">noCompressionUserAgents</code></td><td> <p>The value is a regular expression (using <code>java.util.regex</code>) matching the <code>user-agent</code> header of HTTP clients for which compression should not be used, because these clients, although they do advertise support for the feature, have a broken implementation. The default value is an empty String (regexp matching disabled).</p> </td></tr><tr><td><code class="attributeName">processorCache</code></td><td> <p>The protocol handler caches Processor objects to speed up performance. This setting dictates how many of these objects get cached. <code>-1</code> means unlimited, default is <code>200</code>. If not using Servlet 3.0 asynchronous processing, a good default is to use the same as the maxThreads setting. If using Servlet 3.0 asynchronous processing, a good default is to use the larger of maxThreads and the maximum number of expected concurrent requests (synchronous and asynchronous).</p> </td></tr><tr><td><code class="attributeName">rejectIllegalHeader</code></td><td> <p>If an HTTP request is received that contains an illegal header name or value (e.g. the header name is not a token) this setting determines if the request will be rejected with a 400 response (<code>true</code>) or if the illegal header be ignored (<code>false</code>). The default value is <code>true</code> which will cause the request to be rejected. <br> This setting will be removed in Tomcat 11 onwards where it will be hard-coded to <code>true</code>.</p> </td></tr><tr><td><code class="attributeName">rejectIllegalHeaderName</code></td><td> <p>This attribute is deprecated. It will be removed in Tomcat 10 onwards. It is now an alias for <strong>rejectIllegalHeader</strong>.</p> </td></tr><tr><td><code class="attributeName">relaxedPathChars</code></td><td> <p>The <a href="https://tools.ietf.org/rfc/rfc7230.txt">HTTP/1.1 specification</a> requires that certain characters are %nn encoded when used in URI paths. Unfortunately, many user agents including all the major browsers are not compliant with this specification and use these characters in unencoded form. To prevent Tomcat rejecting such requests, this attribute may be used to specify the additional characters to allow. If not specified, no additional characters will be allowed. The value may be any combination of the following characters: <code>" < > [ \ ] ^ ` { | }</code> . Any other characters present in the value will be ignored.</p> </td></tr><tr><td><code class="attributeName">relaxedQueryChars</code></td><td> <p>The <a href="https://tools.ietf.org/rfc/rfc7230.txt">HTTP/1.1 specification</a> requires that certain characters are %nn encoded when used in URI query strings. Unfortunately, many user agents including all the major browsers are not compliant with this specification and use these characters in unencoded form. To prevent Tomcat rejecting such requests, this attribute may be used to specify the additional characters to allow. If not specified, no additional characters will be allowed. The value may be any combination of the following characters: <code>" < > [ \ ] ^ ` { | }</code> . Any other characters present in the value will be ignored.</p> </td></tr><tr><td><code class="attributeName">restrictedUserAgents</code></td><td> <p>The value is a regular expression (using <code>java.util.regex</code>) matching the <code>user-agent</code> header of HTTP clients for which HTTP/1.1 or HTTP/1.0 keep alive should not be used, even if the clients advertise support for these features. The default value is an empty String (regexp matching disabled).</p> </td></tr><tr><td><code class="attributeName">sendReasonPhrase</code></td><td> <p>Set this attribute to <code>true</code> if you wish to have a reason phrase in the response. The default value is <code>false</code>.</p> <p><strong>Note:</strong> This option is deprecated and will be removed in Tomcat 9. The reason phrase will not be sent.</p> </td></tr><tr><td><code class="attributeName">server</code></td><td> <p>Overrides the Server header for the http response. If set, the value for this attribute overrides any Server header set by a web application. If not set, any value specified by the application is used. If the application does not specify a value then no Server header is set.</p> </td></tr><tr><td><code class="attributeName">serverRemoveAppProvidedValues</code></td><td> <p>If <code>true</code>, any Server header set by a web application will be removed. Note that if <strong>server</strong> is set, this attribute is effectively ignored. If not set, the default value of <code>false</code> will be used.</p> </td></tr><tr><td><code class="attributeName">SSLEnabled</code></td><td> <p>Use this attribute to enable SSL traffic on a connector. To turn on SSL handshake/encryption/decryption on a connector set this value to <code>true</code>. The default value is <code>false</code>. When turning this value <code>true</code> you will want to set the <code>scheme</code> and the <code>secure</code> attributes as well to pass the correct <code>request.getScheme()</code> and <code>request.isSecure()</code> values to the servlets See <a href="#SSL_Support">SSL Support</a> for more information. </p> </td></tr><tr><td><code class="attributeName">tcpNoDelay</code></td><td> <p>If set to <code>true</code>, the TCP_NO_DELAY option will be set on the server socket, which improves performance under most circumstances. This is set to <code>true</code> by default.</p> </td></tr><tr><td><code class="attributeName">threadPriority</code></td><td> <p>The priority of the request processing threads within the JVM. The default value is <code>5</code> (the value of the <code>java.lang.Thread.NORM_PRIORITY</code> constant). See the JavaDoc for the <code>java.lang.Thread</code> class for more details on what this priority means. If an executor is associated with this connector, this attribute is ignored as the connector will execute tasks using the executor rather than an internal thread pool. Note that if an executor is configured any value set for this attribute will be recorded correctly but it will be reported (e.g. via JMX) as <code>-1</code> to make clear that it is not used.</p> </td></tr><tr><td><code class="attributeName">useKeepAliveResponseHeader</code></td><td> <p>(bool) Use this attribute to enable or disable the addition of the <code>Keep-Alive</code> HTTP response header as described in <a href="https://tools.ietf.org/html/draft-thomson-hybi-http-timeout-03">this Internet-Draft</a>. The default value is <code>true</code>.</p> </td></tr><tr><td><code class="attributeName">useVirtualThreads</code></td><td> <p>(bool) Use this attribute to enable or disable usage of virtual threads with the internal executor. If an executor is associated with this connector, this attribute is ignored. The default value is <code>false</code>.</p> </td></tr></table> </div></div> <div class="subsection"><h4 id="Java_TCP_socket_attributes">Java TCP socket attributes</h4><div class="text"> <p>The NIO and NIO2 implementation support the following Java TCP socket attributes in addition to the common Connector and HTTP attributes listed above.</p> <table class="defaultTable"><tr><th style="width: 15%;"> Attribute </th><th style="width: 85%;"> Description </th></tr><tr><td><code class="attributeName">socket.rxBufSize</code></td><td> <p>(int)The socket receive buffer (SO_RCVBUF) size in bytes. JVM default used if not set.</p> </td></tr><tr><td><code class="attributeName">socket.txBufSize</code></td><td> <p>(int)The socket send buffer (SO_SNDBUF) size in bytes. JVM default used if not set. Care should be taken if explicitly setting this value. Very poor performance has been observed on some JVMs with values less than ~8k.</p> </td></tr><tr><td><code class="attributeName">socket.tcpNoDelay</code></td><td> <p>(bool)This is equivalent to standard attribute <strong>tcpNoDelay</strong>.</p> </td></tr><tr><td><code class="attributeName">socket.soKeepAlive</code></td><td> <p>(bool)Boolean value for the socket's keep alive setting (SO_KEEPALIVE). JVM default used if not set.</p> </td></tr><tr><td><code class="attributeName">socket.ooBInline</code></td><td> <p>(bool)Boolean value for the socket OOBINLINE setting. JVM default used if not set.</p> </td></tr><tr><td><code class="attributeName">socket.soReuseAddress</code></td><td> <p>(bool)Boolean value for the sockets reuse address option (SO_REUSEADDR). JVM default used if not set.</p> </td></tr><tr><td><code class="attributeName">socket.soLingerOn</code></td><td> <p>(bool)Boolean value for the sockets so linger option (SO_LINGER). A value for the standard attribute <strong>connectionLinger</strong> that is >=0 is equivalent to setting this to <code>true</code>. A value for the standard attribute <strong>connectionLinger</strong> that is <0 is equivalent to setting this to <code>false</code>. Both this attribute and <code>soLingerTime</code> must be set else the JVM defaults will be used for both.</p> </td></tr><tr><td><code class="attributeName">socket.soLingerTime</code></td><td> <p>(int)Value in seconds for the sockets so linger option (SO_LINGER). This is equivalent to standard attribute <strong>connectionLinger</strong>. Both this attribute and <code>soLingerOn</code> must be set else the JVM defaults will be used for both.</p> </td></tr><tr><td><code class="attributeName">socket.soTimeout</code></td><td> <p>This is equivalent to standard attribute <strong>connectionTimeout</strong>.</p> </td></tr><tr><td><code class="attributeName">socket.performanceConnectionTime</code></td><td> <p>(int)The first value for the performance settings. See <a href="http://docs.oracle.com/javase/7/docs/api/java/net/Socket.html#setPerformancePreferences(int,%20int,%20int)">Socket Performance Options</a>. All three performance attributes must be set else the JVM defaults will be used for all three.</p> </td></tr><tr><td><code class="attributeName">socket.performanceLatency</code></td><td> <p>(int)The second value for the performance settings. See <a href="http://docs.oracle.com/javase/7/docs/api/java/net/Socket.html#setPerformancePreferences(int,%20int,%20int)">Socket Performance Options</a>. All three performance attributes must be set else the JVM defaults will be used for all three.</p> </td></tr><tr><td><code class="attributeName">socket.performanceBandwidth</code></td><td> <p>(int)The third value for the performance settings. See <a href="http://docs.oracle.com/javase/7/docs/api/java/net/Socket.html#setPerformancePreferences(int,%20int,%20int)">Socket Performance Options</a>. All three performance attributes must be set else the JVM defaults will be used for all three.</p> </td></tr><tr><td><code class="attributeName">socket.unlockTimeout</code></td><td> <p>(int) The timeout for a socket unlock. When a connector is stopped, it will try to release the acceptor thread by opening a connector to itself. The default value is <code>250</code> and the value is in milliseconds</p> </td></tr></table> </div></div> <div class="subsection"><h4 id="NIO_specific_configuration">NIO specific configuration</h4><div class="text"> <p>The following attributes are specific to the NIO connector.</p> <table class="defaultTable"><tr><th style="width: 15%;"> Attribute </th><th style="width: 85%;"> Description </th></tr><tr><td><code class="attributeName">pollerThreadPriority</code></td><td> <p>(int)The priority of the poller threads. The default value is <code>5</code> (the value of the <code>java.lang.Thread.NORM_PRIORITY</code> constant). See the JavaDoc for the <code>java.lang.Thread</code> class for more details on what this priority means.</p> </td></tr><tr><td><code class="attributeName">selectorTimeout</code></td><td> <p>(int)The time in milliseconds to timeout on a select() for the poller. This value is important, since connection clean up is done on the same thread, so do not set this value to an extremely high one. The default value is <code>1000</code> milliseconds.</p> </td></tr><tr><td><code class="attributeName">useSendfile</code></td><td> <p>(bool)Use this attribute to enable or disable sendfile capability. The default value is <code>true</code>. Note that the use of sendfile will disable any compression that Tomcat may otherwise have performed on the response.</p> </td></tr><tr><td><code class="attributeName">socket.directBuffer</code></td><td> <p>(bool)Boolean value, whether to use direct ByteBuffers or java mapped ByteBuffers. If <code>true</code> then <code>java.nio.ByteBuffer.allocateDirect()</code> is used to allocate the buffers, if <code>false</code> then <code>java.nio.ByteBuffer.allocate()</code> is used. The default value is <code>false</code>.<br> When you are using direct buffers, make sure you allocate the appropriate amount of memory for the direct memory space. On Sun's JDK that would be something like <code>-XX:MaxDirectMemorySize=256m</code>. </p> </td></tr><tr><td><code class="attributeName">socket.directSslBuffer</code></td><td> <p>(bool)Boolean value, whether to use direct ByteBuffers or java mapped ByteBuffers for the SSL buffers. If <code>true</code> then <code>java.nio.ByteBuffer.allocateDirect()</code> is used to allocate the buffers, if <code>false</code> then <code>java.nio.ByteBuffer.allocate()</code> is used. The default value is <code>false</code>.<br> When you are using direct buffers, make sure you allocate the appropriate amount of memory for the direct memory space. On Oracle's JDK that would be something like <code>-XX:MaxDirectMemorySize=256m</code>. </p> </td></tr><tr><td><code class="attributeName">socket.appReadBufSize</code></td><td> <p>(int)Each connection that is opened up in Tomcat get associated with a read ByteBuffer. This attribute controls the size of this buffer. By default this read buffer is sized at <code>8192</code> bytes. For lower concurrency, you can increase this to buffer more data. For an extreme amount of keep alive connections, decrease this number or increase your heap size.</p> </td></tr><tr><td><code class="attributeName">socket.appWriteBufSize</code></td><td> <p>(int)Each connection that is opened up in Tomcat get associated with a write ByteBuffer. This attribute controls the size of this buffer. By default this write buffer is sized at <code>8192</code> bytes. For low concurrency you can increase this to buffer more response data. For an extreme amount of keep alive connections, decrease this number or increase your heap size.<br> The default value here is pretty low, you should up it if you are not dealing with tens of thousands concurrent connections.</p> </td></tr><tr><td><code class="attributeName">socket.bufferPool</code></td><td> <p>(int)The NIO connector uses a class called NioChannel that holds elements linked to a socket. To reduce garbage collection, the NIO connector caches these channel objects. This value specifies the size of this cache. The default value is <code>500</code>, and represents that the cache will hold 500 NioChannel objects. Other values are <code>-1</code> for unlimited cache and <code>0</code> for no cache.</p> </td></tr><tr><td><code class="attributeName">socket.bufferPoolSize</code></td><td> <p>(int)The NioChannel pool can also be size based, not used object based. The size is calculated as follows:<br> NioChannel <code>buffer size = read buffer size + write buffer size</code><br> SecureNioChannel <code>buffer size = application read buffer size + application write buffer size + network read buffer size + network write buffer size</code><br> The value is in bytes, the default value is <code>1024*1024*100</code> (100MB).</p> </td></tr><tr><td><code class="attributeName">socket.processorCache</code></td><td> <p>(int)Tomcat will cache SocketProcessor objects to reduce garbage collection. The integer value specifies how many objects to keep in the cache at most. The default is <code>500</code>. Other values are <code>-1</code> for unlimited cache and <code>0</code> for no cache.</p> </td></tr><tr><td><code class="attributeName">socket.keyCache</code></td><td> <p>(int)Tomcat will cache KeyAttachment objects to reduce garbage collection. The integer value specifies how many objects to keep in the cache at most. The default is <code>500</code>. Other values are <code>-1</code> for unlimited cache and <code>0</code> for no cache.</p> </td></tr><tr><td><code class="attributeName">socket.eventCache</code></td><td> <p>(int)Tomcat will cache PollerEvent objects to reduce garbage collection. The integer value specifies how many objects to keep in the cache at most. The default is <code>500</code>. Other values are <code>-1</code> for unlimited cache and <code>0</code> for no cache.</p> </td></tr><tr><td><code class="attributeName">selectorPool.maxSelectors</code></td><td> <p>(int)The max selectors to be used in the pool, to reduce selector contention. Use this option when the command line <code>org.apache.tomcat.util.net.NioSelectorShared</code> value is set to false. Default value is <code>200</code>.</p> </td></tr><tr><td><code class="attributeName">selectorPool.maxSpareSelectors</code></td><td> <p>(int)The max spare selectors to be used in the pool, to reduce selector contention. When a selector is returned to the pool, the system can decide to keep it or let it be GC'd. Use this option when the command line <code>org.apache.tomcat.util.net.NioSelectorShared</code> value is set to false. Default value is <code>-1</code> (unlimited).</p> </td></tr><tr><td><code class="attributeName">useInheritedChannel</code></td><td> <p>(bool)Defines if this connector should inherit an inetd/systemd network socket. Only one connector can inherit a network socket. This can option can be used to automatically start Tomcat once a connection request is made to the systemd super daemon's port. The default value is <code>false</code>. See the JavaDoc for the <code>java.nio.channels.spi.SelectorProvider</code> class for more details.</p> </td></tr><tr><td><code class="attributeName">command-line-options</code></td><td> <p>The following command line options are available for the NIO connector:<br> <code>-Dorg.apache.tomcat.util.net.NioSelectorShared=true|false</code> - default is <code>true</code>. Set this value to <code>false</code> if you wish to use a selector for each thread. When you set it to <code>false</code>, you can control the size of the pool of selectors by using the <strong>selectorPool.maxSelectors</strong> attribute.</p> </td></tr></table> </div></div> <div class="subsection"><h4 id="NIO2_specific_configuration">NIO2 specific configuration</h4><div class="text"> <p>The following attributes are specific to the NIO2 connector.</p> <table class="defaultTable"><tr><th style="width: 15%;"> Attribute </th><th style="width: 85%;"> Description </th></tr><tr><td><code class="attributeName">useSendfile</code></td><td> <p>(bool)Use this attribute to enable or disable sendfile capability. The default value is <code>true</code>. Note that the use of sendfile will disable any compression that Tomcat may otherwise have performed on the response.</p> </td></tr><tr><td><code class="attributeName">socket.directBuffer</code></td><td> <p>(bool)Boolean value, whether to use direct ByteBuffers or java mapped ByteBuffers. If <code>true</code> then <code>java.nio.ByteBuffer.allocateDirect()</code> is used to allocate the buffers, if <code>false</code> then <code>java.nio.ByteBuffer.allocate()</code> is used. The default value is <code>false</code>.<br> When you are using direct buffers, make sure you allocate the appropriate amount of memory for the direct memory space. On Sun's JDK that would be something like <code>-XX:MaxDirectMemorySize=256m</code>. </p> </td></tr><tr><td><code class="attributeName">socket.directSslBuffer</code></td><td> <p>(bool)Boolean value, whether to use direct ByteBuffers or java mapped ByteBuffers for the SSL buffers. If <code>true</code> then <code>java.nio.ByteBuffer.allocateDirect()</code> is used to allocate the buffers, if <code>false</code> then <code>java.nio.ByteBuffer.allocate()</code> is used. The default value is <code>false</code>.<br> When you are using direct buffers, make sure you allocate the appropriate amount of memory for the direct memory space. On Oracle's JDK that would be something like <code>-XX:MaxDirectMemorySize=256m</code>. </p> </td></tr><tr><td><code class="attributeName">socket.appReadBufSize</code></td><td> <p>(int)Each connection that is opened up in Tomcat get associated with a read ByteBuffer. This attribute controls the size of this buffer. By default this read buffer is sized at <code>8192</code> bytes. For lower concurrency, you can increase this to buffer more data. For an extreme amount of keep alive connections, decrease this number or increase your heap size.</p> </td></tr><tr><td><code class="attributeName">socket.appWriteBufSize</code></td><td> <p>(int)Each connection that is opened up in Tomcat get associated with a write ByteBuffer. This attribute controls the size of this buffer. By default this write buffer is sized at <code>8192</code> bytes. For low concurrency you can increase this to buffer more response data. For an extreme amount of keep alive connections, decrease this number or increase your heap size.<br> The default value here is pretty low, you should up it if you are not dealing with tens of thousands concurrent connections.</p> </td></tr><tr><td><code class="attributeName">socket.bufferPool</code></td><td> <p>(int)The NIO2 connector uses a class called Nio2Channel that holds elements linked to a socket. To reduce garbage collection, the NIO2 connector caches these channel objects. This value specifies the size of this cache. The default value is <code>500</code>, and represents that the cache will hold 500 Nio2Channel objects. Other values are <code>-1</code> for unlimited cache and <code>0</code> for no cache.</p> </td></tr><tr><td><code class="attributeName">socket.processorCache</code></td><td> <p>(int)Tomcat will cache SocketProcessor objects to reduce garbage collection. The integer value specifies how many objects to keep in the cache at most. The default is <code>500</code>. Other values are <code>-1</code> for unlimited cache and <code>0</code> for no cache.</p> </td></tr></table> </div></div> <div class="subsection"><h4 id="APR/native_specific_configuration">APR/native specific configuration</h4><div class="text"> <p>The following attributes are specific to the APR/native connector.</p> <table class="defaultTable"><tr><th style="width: 15%;"> Attribute </th><th style="width: 85%;"> Description </th></tr><tr><td><code class="attributeName">deferAccept</code></td><td> <p>Sets the <code>TCP_DEFER_ACCEPT</code> flag on the listening socket for this connector. The default value is <code>true</code> where <code>TCP_DEFER_ACCEPT</code> is supported by the operating system, otherwise it is <code>false</code>.</p> </td></tr><tr><td><code class="attributeName">ipv6v6only</code></td><td> <p>If listening on an IPv6 address on a dual stack system, should the connector only listen on the IPv6 address? If not specified the default is <code>false</code> and the connector will listen on the IPv6 address and the equivalent IPv4 address if present.</p> </td></tr><tr><td><code class="attributeName">pollerThreadCount</code></td><td> <p>Number of threads used to poll kept alive connections. On Windows the default is chosen so that the sockets managed by each thread is less than 1024. For Linux the default is 1. Changing the default on Windows is likely to have a negative performance impact.</p> </td></tr><tr><td><code class="attributeName">pollTime</code></td><td> <p>Duration of a poll call in microseconds. Lowering this value will slightly decrease latency of connections being kept alive in some cases, but will use more CPU as more poll calls are being made. The default value is 2000 (2ms).</p> </td></tr><tr><td><code class="attributeName">sendfileSize</code></td><td> <p>Amount of sockets that the poller responsible for sending static files asynchronously can hold at a given time. Extra connections will be closed right away without any data being sent (resulting in a zero length file on the client side). Note that in most cases, sendfile is a call that will return right away (being taken care of "synchronously" by the kernel), and the sendfile poller will not be used, so the amount of static files which can be sent concurrently is much larger than the specified amount. The default value is 1024.</p> </td></tr><tr><td><code class="attributeName">threadPriority</code></td><td> <p>(int)The priority of the acceptor and poller threads. The default value is <code>5</code> (the value of the <code>java.lang.Thread.NORM_PRIORITY</code> constant). See the JavaDoc for the <code>java.lang.Thread</code> class for more details on what this priority means.</p> </td></tr><tr><td><code class="attributeName">useSendfile</code></td><td> <p>(bool)Use this attribute to enable or disable sendfile capability. The default value is <code>true</code>. Note that the use of sendfile will disable any compression that Tomcat may otherwise have performed on the response.</p> </td></tr></table> </div></div> </div><h3 id="Nested_Components">Nested Components</h3><div class="text"> <p>First implemented in Tomcat 9 and back-ported to 8.5, Tomcat now supports Server Name Indication (SNI). This allows multiple SSL configurations to be associated with a single secure connector with the configuration used for any given connection determined by the host name requested by the client. To facilitate this, the <strong>SSLHostConfig</strong> element was added which can be used to define one of these configurations. Any number of <strong>SSLHostConfig</strong> may be nested in a <strong>Connector</strong>. At the same time, support was added for multiple certificates to be associated with a single <strong>SSLHostConfig</strong>. Each SSL certificate is therefore configured in a <strong>Certificate</strong> element with in an <strong>SSLHostConfig</strong>. For further information, see the SSL Support section below.</p> <p>When OpenSSL is providing the TLS implementation, one or more <strong>OpenSSLConfCmd</strong> elements may be nested inside a <strong>OpenSSLConf</strong> element to configure OpenSSL via OpenSSL's <code>SSL_CONF</code> API. A single <strong>OpenSSLConf</strong> element may be nested in a <strong>SSLHostConfig</strong> element. For further information, see the SSL Support section below</p> </div><h3 id="Special_Features">Special Features</h3><div class="text"> <div class="subsection"><h4 id="HTTP/1.1_and_HTTP/1.0_Support">HTTP/1.1 and HTTP/1.0 Support</h4><div class="text"> <p>This <strong>Connector</strong> supports all of the required features of the HTTP/1.1 protocol, as described in RFCs 7230-7235, including persistent connections, pipelining, expectations and chunked encoding. If the client supports only HTTP/1.0 or HTTP/0.9, the <strong>Connector</strong> will gracefully fall back to supporting this protocol as well. No special configuration is required to enable this support. The <strong>Connector</strong> also supports HTTP/1.0 keep-alive.</p> <p>RFC 7230 requires that HTTP servers always begin their responses with the highest HTTP version that they claim to support. Therefore, this <strong>Connector</strong> will always return <code>HTTP/1.1</code> at the beginning of its responses.</p> </div></div> <div class="subsection"><h4 id="HTTP/2_Support">HTTP/2 Support</h4><div class="text"> <p>HTTP/2 support is provided for TLS (h2), non-TLS via HTTP upgrade (h2c) and direct HTTP/2 (h2c) connections. To enable HTTP/2 support for an HTTP connector the following <strong>UpgradeProtocol</strong> element must be nested within the <strong>Connector</strong> with a <strong>className</strong> attribute of <code>org.apache.coyote.http2.Http2Protocol</code>.</p> <div class="codeBox"><pre><code><Connector ... > <UpgradeProtocol className="org.apache.coyote.http2.Http2Protocol" /> </Connector></code></pre></div> <p>Because Java 8's TLS implementation does not support ALPN (which is required for HTTP/2 over TLS), you must be using an OpenSSL based TLS implementation to enable HTTP/2 support. See the <code>sslImplementationName</code> attribute of the <strong>Connector</strong>.</p> <p>Additional configuration attributes are available. See the <a href="http2.html">HTTP/2 Upgrade Protocol</a> documentation for details.</p> </div></div> <div class="subsection"><h4 id="Proxy_Support">Proxy Support</h4><div class="text"> <p>The <code>proxyName</code> and <code>proxyPort</code> attributes can be used when Tomcat is run behind a proxy server. These attributes modify the values returned to web applications that call the <code>request.getServerName()</code> and <code>request.getServerPort()</code> methods, which are often used to construct absolute URLs for redirects. Without configuring these attributes, the values returned would reflect the server name and port on which the connection from the proxy server was received, rather than the server name and port to whom the client directed the original request.</p> <p>For more information, see the <a href="../proxy-howto.html">Proxy Support How-To</a>.</p> </div></div> <div class="subsection"><h4 id="SSL_Support">SSL Support</h4><div class="text"> <p>You can enable SSL support for a particular instance of this <strong>Connector</strong> by setting the <code>SSLEnabled</code> attribute to <code>true</code>.</p> <p>You will also need to set the <code>scheme</code> and <code>secure</code> attributes to the values <code>https</code> and <code>true</code> respectively, to pass correct information to the servlets.</p> <p>The NIO and NIO2 connectors use either the JSSE Java SSL implementation or an OpenSSL implementation, whereas the APR/native connector uses OpenSSL only. Prior to Tomcat 8.5, different configuration attributes were used for JSSE and OpenSSL. From Tomcat 8.5 onwards, and as far as possible, common configuration attributes are used for both JSSE and OpenSSL. Also if using the JSSE OpenSSL implementation, configuration can be set using either the JSSE or APR attributes (note: but not both types within the same configuration). This is to aid simpler switching between connector implementations for SSL connectors.</p> <p>Each secure connector must define at least one <strong>SSLHostConfig</strong>. The names of the <strong>SSLHostConfig</strong> elements must be unique and one of them must match the <code>defaultSSLHostConfigName</code> attribute of the <strong>Connector</strong>.</p> <p>Each <strong>SSLHostConfig</strong> must in turn define at least one <strong>Certificate</strong>. The types of the <strong>Certificate</strong>s must be unique.</p> <p>As of Tomcat 8.5, the majority of the SSL configuration attributes in the <strong>Connector</strong> are deprecated. If specified, they will be used to configure a <strong>SSLHostConfig</strong> and <strong>Certificate</strong> for the <code>defaultSSLHostConfigName</code>. Note that if an explicit <strong>SSLHostConfig</strong> element also exists for the <code>defaultSSLHostConfigName</code> then that will be treated as a configuration error. It is expected that Tomcat 10 will drop support for the SSL configuration attributes in the <strong>Connector</strong>.</p> <p>In addition to the standard TLS related request attributes defined in section 3.10 of the Servlet specification, Tomcat supports a number of additional TLS related attributes. The full list may be found in the <a href="http://tomcat.apache.org/tomcat-10.0-doc/api/index.html">SSLSupport Javadoc</a>.</p> <p>For more information, see the <a href="../ssl-howto.html">SSL Configuration How-To</a>.</p> </div></div> <div class="subsection"><h4 id="SSL_Support_-_SSLHostConfig">SSL Support - SSLHostConfig</h4><div class="text"> <p></p> <table class="defaultTable"><tr><th style="width: 15%;"> Attribute </th><th style="width: 85%;"> Description </th></tr><tr><td><code class="attributeName">certificateRevocationListFile</code></td><td> <p>Name of the file that contains the concatenated certificate revocation lists for the certificate authorities. The format is PEM-encoded. If not defined, client certificates will not be checked against a certificate revocation list (unless an OpenSSL based connector is used and <strong>certificateRevocationListPath</strong> is defined). Relative paths will be resolved against <code>$CATALINA_BASE</code>. JSSE based connectors may also specify a URL for this attribute.</p> </td></tr><tr><td><code class="attributeName">certificateRevocationListPath</code></td><td> <p>OpenSSL only.</p> <p>Name of the directory that contains the certificate revocation lists for the certificate authorities. The format is PEM-encoded. Relative paths will be resolved against <code>$CATALINA_BASE</code>.</p> </td></tr><tr><td><code class="attributeName">certificateVerification</code></td><td> <p>Set to <code>required</code> if you want the SSL stack to require a valid certificate chain from the client before accepting a connection. Set to <code>optional</code> if you want the SSL stack to request a client Certificate, but not fail if one isn't presented. Set to <code>optionalNoCA</code> if you want client certificates to be optional and you don't want Tomcat to check them against the list of trusted CAs. If the TLS provider doesn't support this option (OpenSSL does, JSSE does not) it is treated as if <code>optional</code> was specified. If <code>optionalNoCA</code> is configured then OCSP will also be disabled. <code>none</code> value (which is the default) will not require a certificate chain unless the client requests a resource protected by a security constraint that uses <code>CLIENT-CERT</code> authentication.</p> </td></tr><tr><td><code class="attributeName">certificateVerificationDepth</code></td><td> <p>The maximum number of intermediate certificates that will be allowed when validating client certificates. If not specified, the default value of 10 will be used.</p> </td></tr><tr><td><code class="attributeName">caCertificateFile</code></td><td> <p>OpenSSL only.</p> <p>Name of the file that contains the concatenated certificates for the trusted certificate authorities. The format is PEM-encoded.</p> </td></tr><tr><td><code class="attributeName">caCertificatePath</code></td><td> <p>OpenSSL only.</p> <p>Name of the directory that contains the certificates for the trusted certificate authorities. The format is PEM-encoded.</p> </td></tr><tr><td><code class="attributeName">ciphers</code></td><td> <p>The ciphers to enable using the OpenSSL syntax. (See the OpenSSL documentation for the list of ciphers supported and the syntax). Alternatively, a comma separated list of ciphers using the standard OpenSSL cipher names or the standard JSSE cipher names may be used.</p> <p>Different versions of OpenSSL may interpret the same cipher string differently. For example, the <code>CCM8</code> ciphers were moved from <code>HIGH</code> to <code>MEDIUM</code> in OpenSSL 3.2. Regardless of the OpenSSL or JSSE version used, Tomcat converts the provided cipher value to a list of ciphers in a manner consistent with the latest OpenSSL development branch. This list of ciphers is then passed to the SSL implementation.</p> <p>Only the ciphers that are supported by the SSL implementation will be used. Any ciphers in the list derived from a non-default cipher string that are not supported by the SSL implementation will be logged in a <code>WARNING</code> message when the Connector starts. The warning can be avoided by providing an explicit list of ciphers that are supported by the configured SSL implementation.</p> <p>If not specified, a default (using the OpenSSL notation) of <code>HIGH:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!kRSA</code> will be used.</p> <p>Note that, by default, the order in which ciphers are defined is treated as an order of preference. See <code>honorCipherOrder</code>.</p> </td></tr><tr><td><code class="attributeName">disableCompression</code></td><td> <p>OpenSSL only.</p> <p>Configures if compression is disabled. The default is <code>true</code>. If the OpenSSL version used does not support disabling compression then the default for that OpenSSL version will be used.</p> </td></tr><tr><td><code class="attributeName">disableSessionTickets</code></td><td> <p>OpenSSL only.</p> <p>Disables use of TLS session tickets (RFC 5077) if set to <code>true</code>. Default is <code>false</code>. Note that when TLS session tickets are in use, the full peer certificate chain will only be available on the first connection. Subsequent connections (that use a ticket to estrablish the TLS session) will only have the peer certificate, not the full chain.</p> </td></tr><tr><td><code class="attributeName">honorCipherOrder</code></td><td> <p>Set to <code>true</code> to enforce the server's cipher order (from the <code>ciphers</code> setting) instead of allowing the client to choose the cipher. The default is <code>false</code>. Use of this feature requires Java 8 or later.</p> </td></tr><tr><td><code class="attributeName">hostName</code></td><td> <p>The name of the SSL Host. This should either be the fully qualified domain name (e.g. <code>tomcat.apache.org</code>) or a wild card domain name (e.g. <code>*.apache.org</code>). If not specified, the default value of <code>_default_</code> will be used. Provided values are always converted to lower case.</p> </td></tr><tr><td><code class="attributeName">insecureRenegotiation</code></td><td> <p>OpenSSL only.</p> <p>Configures if insecure renegotiation is allowed. The default is <code>false</code>. If the OpenSSL version used does not support configuring if insecure renegotiation is allowed then the default for that OpenSSL version will be used.</p> </td></tr><tr><td><code class="attributeName">keyManagerAlgorithm</code></td><td> <p>JSSE only.</p> <p>The <code>KeyManager</code> algorithm to be used. This defaults to <code>KeyManagerFactory.getDefaultAlgorithm()</code> which returns <code>SunX509</code> for Sun JVMs. IBM JVMs return <code>IbmX509</code>. For other vendors, consult the JVM documentation for the default value.</p> </td></tr><tr><td><code class="attributeName">protocols</code></td><td> <p>The names of the protocols to support when communicating with clients. This should be a list of any combination of the following: </p> <ul><li>SSLv2Hello</li><li>SSLv3</li><li>TLSv1</li><li>TLSv1.1</li> <li>TLSv1.2</li><li>TLSv1.3</li><li>all</li></ul> <p>Each token in the list can be prefixed with a plus sign ("+") or a minus sign ("-"). A plus sign adds the protocol, a minus sign removes it form the current list. The list is built starting from an empty list.</p> <p>The token <code>all</code> is an alias for <code>SSLv2Hello,TLSv1,TLSv1.1,TLSv1.2,TLSv1.3</code>.</p> <p>Note that <code>TLSv1.3</code> is only supported for JSSE when using a JVM that implements <code>TLSv1.3</code>.</p> <p>Note that <code>SSLv2Hello</code> will be ignored for OpenSSL based secure connectors. If more than one protocol is specified for an OpenSSL based secure connector it will always support <code>SSLv2Hello</code>. If a single protocol is specified it will not support <code>SSLv2Hello</code>.</p> <p>Note that <code>SSLv2</code> and <code>SSLv3</code> are inherently unsafe.</p> <p>If not specified, the default value of <code>all</code> will be used.</p> </td></tr><tr><td><code class="attributeName">revocationEnabled</code></td><td> <p>JSSE only.</p> <p>Should the JSSE provider enable certificate revocation checks? If <strong>certificateRevocationListFile</strong> is set then this attribute is ignored and revocation checks are always enabled. This attribute is intended to enable revocation checks that have been configured for the current JSSE provider via other means. If not specified, a default of <code>false</code> is used.</p> </td></tr><tr><td><code class="attributeName">sessionCacheSize</code></td><td> <p>The number of SSL sessions to maintain in the session cache. Specify <code>-1</code> to use the implementation default. Values of zero and above are passed to the implementation. Zero is used to specify an unlimited cache size and is not recommended. If not specified, a default of <code>-1</code> is used.</p> </td></tr><tr><td><code class="attributeName">sessionTimeout</code></td><td> <p>The time, in seconds, after the creation of an SSL session that it will timeout. Specify <code>-1</code> to use the implementation default. Values of zero and above are passed to the implementation. Zero is used to specify an unlimited timeout and is not recommended. If not specified, a default of 86400 (24 hours) is used.</p> </td></tr><tr><td><code class="attributeName">sslProtocol</code></td><td> <p>JSSE only.</p> <p>The SSL protocol(s) to use (a single value may enable multiple protocols - see the JVM documentation for details). If not specified, the default is <code>TLS</code>. The permitted values may be obtained from the JVM documentation for the allowed values for algorithm when creating an <code>SSLContext</code> instance e.g. <a href="http://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#SSLContext"> Oracle Java 7</a>. Note: There is overlap between this attribute and <code>protocols</code>.</p> </td></tr><tr><td><code class="attributeName">trustManagerClassName</code></td><td> <p>JSSE only.</p> <p>The name of a custom trust manager class to use to validate client certificates. The class must have a zero argument constructor and must also implement <code>javax.net.ssl.X509TrustManager</code>. If this attribute is set, the trust store attributes may be ignored.</p> </td></tr><tr><td><code class="attributeName">truststoreAlgorithm</code></td><td> <p>JSSE only.</p> <p>The algorithm to use for truststore. If not specified, the default value returned by <code>javax.net.ssl.TrustManagerFactory.getDefaultAlgorithm()</code> is used.</p> </td></tr><tr><td><code class="attributeName">truststoreFile</code></td><td> <p>JSSE only.</p> <p>The trust store file to use to validate client certificates. The default is the value of the <code>javax.net.ssl.trustStore</code> system property. If neither this attribute nor the default system property is set, no trust store will be configured. Relative paths will be resolved against <code>$CATALINA_BASE</code>. A URL may also be used for this attribute.</p> </td></tr><tr><td><code class="attributeName">truststorePassword</code></td><td> <p>JSSE only.</p> <p>The password to access the trust store. The default is the value of the <code>javax.net.ssl.trustStorePassword</code> system property. If that property is null, no trust store password will be configured. If an invalid trust store password is specified, a warning will be logged and an attempt will be made to access the trust store without a password which will skip validation of the trust store contents.</p> </td></tr><tr><td><code class="attributeName">truststoreProvider</code></td><td> <p>JSSE only.</p> <p>The name of the truststore provider to be used for the server certificate. The default is the value of the <code>javax.net.ssl.trustStoreProvider</code> system property. If that property is null, the value of <code>keystoreProvider</code> is used as the default. If neither this attribute, the default system property nor <code>keystoreProvider</code> is set, the list of registered providers is traversed in preference order and the first provider that supports the <code>truststoreType</code> is used. </p> </td></tr><tr><td><code class="attributeName">truststoreType</code></td><td> <p>JSSE only.</p> <p>The type of key store used for the trust store. The default is the value of the <code>javax.net.ssl.trustStoreType</code> system property. If that property is null, a single certificate has been configured for this TLS virtual host and that certificate has a <code>keystoreType</code> that is not <code>PKCS12</code> then the default will be the <code>keystoreType</code> of the single certificate. If none of these identify a default, the default will be <code>JKS</code>. See the notes on <a href="#Key_store_types">key store types</a> below.</p> </td></tr></table> </div></div> <div class="subsection"><h4 id="SSL_Support_-_Certificate">SSL Support - Certificate</h4><div class="text"> <p></p> <table class="defaultTable"><tr><th style="width: 15%;"> Attribute </th><th style="width: 85%;"> Description </th></tr><tr><td><code class="attributeName">certificateFile</code></td><td> <p>Name of the file that contains the server certificate. The format is PEM-encoded. Relative paths will be resolved against <code>$CATALINA_BASE</code>.</p> <p>In addition to the certificate, the file can also contain as optional elements DH parameters and/or an EC curve name for ephemeral keys, as generated by <code>openssl dhparam</code> and <code>openssl ecparam</code>, respectively. The output of the respective OpenSSL command can simply be concatenated to the certificate file.</p> <p>This attribute is required unless <strong>certificateKeystoreFile</strong> is specified.</p> </td></tr><tr><td><code class="attributeName">certificateChainFile</code></td><td> <p>Name of the file that contains the certificate chain associated with the server certificate used. The format is PEM-encoded. Relative paths will be resolved against <code>$CATALINA_BASE</code>.</p> <p>The certificate chain used for Tomcat should not include the server certificate as its first element.</p> <p>Note that when using more than one certificate for different types, they all must use the same certificate chain.</p> </td></tr><tr><td><code class="attributeName">certificateKeyAlias</code></td><td> <p>JSSE only.</p> <p>The alias used for the server key and certificate in the keystore. If not specified, the first key read from the keystore will be used. The order in which keys are read from the keystore is implementation dependent. It may not be the case that keys are read from the keystore in the same order as they were added. If more than one key is present in the keystore it is strongly recommended that a keyAlias is configured to ensure that the correct key is used.</p> </td></tr><tr><td><code class="attributeName">certificateKeyFile</code></td><td> <p>Name of the file that contains the server private key. The format is PEM-encoded. The default value is the value of <strong>certificateFile</strong> and in this case both certificate and private key have to be in this file (NOT RECOMMENDED). Relative paths will be resolved against <code>$CATALINA_BASE</code>.</p> </td></tr><tr><td><code class="attributeName">certificateKeyPassword</code></td><td> <p>The password used to access the private key associated with the server certificate from the specified file.</p> <p>If not specified, the default behaviour for JSSE is to use the <strong>certificateKeystorePassword</strong>. For OpenSSL the default behaviour is not to use a password, but OpenSSL will prompt for one, if required.</p> </td></tr><tr><td><code class="attributeName">certificateKeyPasswordFile</code></td><td> <p>The password file used to access the private key associated with the server certificate from the specified file. This attribute takes precedence over <strong>certificateKeyPassword</strong>.</p> <p>If not specified, the default behaviour for JSSE is to use the <strong>certificateKeystorePasswordFile</strong>. For OpenSSL the default behaviour is not to use a password (file), but OpenSSL will prompt for one, if required.</p> </td></tr><tr><td><code class="attributeName">certificateKeystoreFile</code></td><td> <p>JSSE only.</p> <p>The pathname of the keystore file where you have stored the server certificate and key to be loaded. By default, the pathname is the file <code>.keystore</code> in the operating system home directory of the user that is running Tomcat. If your <code>keystoreType</code> doesn't need a file use <code>""</code> (empty string) or <code>NONE</code> for this parameter. Relative paths will be resolved against <code>$CATALINA_BASE</code>. A URI may also be used for this attribute. When using a domain keystore (<code>keystoreType</code> of <code>DKS</code>), this parameter should be the URI to the domain keystore.</p> <p>This attribute is required unless <strong>certificateFile</strong> is specified.</p> </td></tr><tr><td><code class="attributeName">certificateKeystorePassword</code></td><td> <p>JSSE only.</p> <p>The password to use to access the keystore containing the server's private key and certificate. If not specified, a default of <code>changeit</code> will be used.</p> </td></tr><tr><td><code class="attributeName">certificateKeystorePasswordFile</code></td><td> <p>JSSE only.</p> <p>The password file to use to access the keystore containing the server's private key and certificate. This attribute takes precedence over <strong>certificateKeystorePassword</strong>.</p> </td></tr><tr><td><code class="attributeName">certificateKeystoreProvider</code></td><td> <p>JSSE only.</p> <p>The name of the keystore provider to be used for the server certificate. If not specified, the value of the system property <code>javax.net.ssl.keyStoreProvider</code> is used. If neither this attribute nor the system property are set, the list of registered providers is traversed in preference order and the first provider that supports the <code>keystoreType</code> is used. </p> </td></tr><tr><td><code class="attributeName">certificateKeystoreType</code></td><td> <p>JSSE only.</p> <p>The type of keystore file to be used for the server certificate. If not specified, the value of the system property <code>javax.net.ssl.keyStoreType</code> is used. If neither this attribute nor the system property are set, a default value of "<code>JKS</code>". is used. See the notes on <a href="#Key_store_types">key store types</a> below.</p> </td></tr><tr><td><code class="attributeName">type</code></td><td> <p>The type of certificate. This is used to identify the ciphers that are compatible with the certificate. It must be one of <code>UNDEFINED</code>, <code>RSA</code>, <code>DSA</code> or <code>EC</code>. If only one <strong>Certificate</strong> is nested within a <code>SSLHostConfig</code> then this attribute is not required and will default to <code>UNDEFINED</code>. If multiple <strong>Certificate</strong>s are nested within a <code>SSLHostConfig</code> then this attribute is required and each <strong>Certificate</strong> must have a unique type.</p> </td></tr></table> </div></div> <div class="subsection"><h4 id="SSL_Support_-_Connector_-_NIO_and_NIO2">SSL Support - Connector - NIO and NIO2</h4><div class="text"> <p>When APR/native is enabled, the connectors will default to using OpenSSL through JSSE, which may be more optimized than the JSSE Java implementation depending on the processor being used, and can be complemented with many commercial accelerator components.</p> <p>The following NIO and NIO2 SSL configuration attributes are not specific to a virtual host and, therefore, must be configured on the connector.</p> <table class="defaultTable"><tr><th style="width: 15%;"> Attribute </th><th style="width: 85%;"> Description </th></tr><tr><td><code class="attributeName">sniParseLimit</code></td><td> <p>In order to implement SNI support, Tomcat has to parse the first TLS message received on a new TLS connection (the client hello) to extract the requested server name. The message needs to be buffered so it can then be passed to the JSSE implementation for normal TLS processing. In theory, this first message could be very large although in practice it is typically a few hundred bytes. This attribute sets the maximum message size that Tomcat will buffer. If a message exceeds this size, the connection will be configured as if no server name was indicated by the client. If not specified a default of <code>65536</code> (64k) will be used.</p> </td></tr><tr><td><code class="attributeName">sslImplementationName</code></td><td> <p>The class name of the SSL implementation to use. If not specified and the tomcat-native library is not installed, the default of <code>org.apache.tomcat.util.net.jsse.JSSEImplementation</code> will be used which wraps JVM's default JSSE provider. Note that the JVM can be configured to use a different JSSE provider as the default. Tomcat also bundles a special SSL implementation for JSSE that is backed by OpenSSL. To enable it, the native library should be enabled as if intending to use the APR connector, and Tomcat will automatically enable it and the default value of this attribute becomes <code>org.apache.tomcat.util.net.openssl.OpenSSLImplementation</code>. In that case, the attributes from either JSSE and OpenSSL configuration styles can be used, as long as the two types are not mixed (for example, it is not allowed to define use of a Java keystore and specify a separate pem private key using the OpenSSL attribute).</p> </td></tr></table> </div></div> <div class="subsection"><h4 id="SSL_Support_-_OpenSSL's_SSL_CONF_API">SSL Support - OpenSSL's SSL_CONF API</h4><div class="text"> <p>When OpenSSL is providing the TLS implementation, one or more <strong>OpenSSLConfCmd</strong> elements may be nested inside a <strong>OpenSSLConf</strong> element to configure OpenSSL via OpenSSL's <code>SSL_CONF</code> API. A single <strong>OpenSSLConf</strong> element may be nested in a <strong>SSLHostConfig</strong> element.</p> <p>The set of configuration file commands available depends on the OpenSSL version being used. For a list of supported command names and values, see the section Supported configuration file commands in the <a href="https://www.openssl.org/docs/manmaster/man3/SSL_CONF_cmd.html#SUPPORTED-CONFIGURATION-FILE-COMMANDS">SSL_CONF_cmd(3)</a> manual page for OpenSSL. Some of the configuration file commands can be used as alternatives to <strong>SSLHostConfig</strong> attributes. It is recommended that configuration file commands are only used where the feature cannot be configured using <strong>SSLHostConfig</strong> attributes.</p> <p>The <strong>OpenSSLConf</strong> element does not support any attributes.</p> <p>The <strong>OpenSSLConfCmd</strong> element supports the following attributes.</p> <table class="defaultTable"><tr><th style="width: 15%;"> Attribute </th><th style="width: 85%;"> Description </th></tr><tr><td><strong><code class="attributeName">name</code></strong></td><td> <p>The name of the configuration file command.</p> </td></tr><tr><td><code class="attributeName">value</code></td><td> <p>The value to use for the configuration file command.</p> </td></tr></table> </div></div> <div class="subsection"><h4 id="Key_store_types">Key store types</h4><div class="text"> <p>In addition to the standard key store types (JKS and PKCS12), most Java runtimes support additional key store types such as Windows-ROOT, Windows-My, DKS as well as hardware security modules. Generally, to use these additional keystore types with a TLS Connector in Tomcat:</p> <ul> <li>Set the certificateKeystoreType and/or truststoreType Connector attribute (as appropriate) to the necessary type</li> <li>If a configuration file is required, set the certificateKeystoreFile and/or truststoreFile Connector attribute (as appropriate) to point to the file</li> <li>If no configuration file is required then you will almost certainly need to explicitly set the certificateKeystoreFile and/or truststoreFile Connector attribute (as appropriate) to the empty string ("")</li> <li>If a password is required, set the certificateKeystorePassword and/or truststorePassword Connector attribute (as appropriate) to the required password</li> <li>If no password is required then you will almost certainly need to explicitly set the certificateKeystorePassword and/or truststorePassword Connector attribute (as appropriate) to the empty string ("")</li> </ul> <p>Variations in key store implementations, combined with the key store manipulation Tomcat does in the background to allow interoperability between JSSE and OpenSSL configuration styles, means that some keystores may need slightly different configuration. Assistance is always available from the <a href="http://tomcat.apache.org/lists.html#tomcat-users">Apache Tomcat users mailing list</a>. We aim to document any key stores that vary from the above advice here. Currently there are none we are aware of.</p> </div></div> <div class="subsection"><h4 id="SSL_Support_-_Connector_-_NIO_and_NIO2_(deprecated)">SSL Support - Connector - NIO and NIO2 (deprecated)</h4><div class="text"> <p>The following NIO and NIO2 SSL configuration attributes have been deprecated in favor of the default <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.. </p> <table class="defaultTable"><tr><th style="width: 15%;"> Attribute </th><th style="width: 85%;"> Description </th></tr><tr><td><code class="attributeName">algorithm</code></td><td> <p>This is an alias for the <code>keyManagerAlgorithm</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">ciphers</code></td><td> <p>This is an alias for the <code>ciphers</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">clientAuth</code></td><td> <p>This is an alias for the <code>certificateVerification</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">crlFile</code></td><td> <p>This is an alias for the <code>certificateRevocationListFile</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">keyAlias</code></td><td> <p>This is an alias for the <code>certificateKeyAlias</code> attribute of the first <a href="#SSL_Support_-_Certificate">Certificate</a> element nested in the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_Certificate">Certificate</a> and/or <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, they will be created.</p> </td></tr><tr><td><code class="attributeName">keyPass</code></td><td> <p>This is an alias for the <code>certificateKeyPassword</code> attribute of the first <a href="#SSL_Support_-_Certificate">Certificate</a> element nested in the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_Certificate">Certificate</a> and/or <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, they will be created.</p> </td></tr><tr><td><code class="attributeName">keystoreFile</code></td><td> <p>This is an alias for the <code>certificateKeystoreFile</code> attribute of the first <a href="#SSL_Support_-_Certificate">Certificate</a> element nested in the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_Certificate">Certificate</a> and/or <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, they will be created.</p> </td></tr><tr><td><code class="attributeName">keystorePass</code></td><td> <p>This is an alias for the <code>certificateKeystorePassword</code> attribute of the first <a href="#SSL_Support_-_Certificate">Certificate</a> element nested in the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_Certificate">Certificate</a> and/or <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, they will be created.</p> </td></tr><tr><td><code class="attributeName">keystoreProvider</code></td><td> <p>This is an alias for the <code>certificateKeystoreProvider</code> attribute of the first <a href="#SSL_Support_-_Certificate">Certificate</a> element nested in the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_Certificate">Certificate</a> and/or <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, they will be created.</p> </td></tr><tr><td><code class="attributeName">keystoreType</code></td><td> <p>This is an alias for the <code>certificateKeystoreType</code> attribute of the first <a href="#SSL_Support_-_Certificate">Certificate</a> element nested in the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_Certificate">Certificate</a> and/or <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, they will be created.</p> </td></tr><tr><td><code class="attributeName">sessionCacheSize</code></td><td> <p>This is an alias for the <code>sessionCacheSize</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">sessionTimeout</code></td><td> <p>This is an alias for the <code>sessionTimeout</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">sslEnabledProtocols</code></td><td> <p>This is an alias for the <code>protocols</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">sslProtocol</code></td><td> <p>This is an alias for the <code>sslProtocol</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">trustManagerClassName</code></td><td> <p>This is an alias for the <code>trustManagerClassName</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">trustMaxCertLength</code></td><td> <p>This is an alias for the <code>certificateVerificationDepth</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">truststoreAlgorithm</code></td><td> <p>This is an alias for the <code>truststoreAlgorithm</code> attribute of <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">truststoreFile</code></td><td> <p>This is an alias for the <code>truststoreFile</code> attribute of <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">truststorePass</code></td><td> <p>This is an alias for the <code>truststorePassword</code> attribute of <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">truststoreProvider</code></td><td> <p>This is an alias for the <code>truststoreProvider</code> attribute of <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">truststoreType</code></td><td> <p>This is an alias for the <code>truststoreType</code> attribute of <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">useServerCipherSuitesOrder</code></td><td> <p>This is an alias for the <code>honorCipherOrder</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr></table> </div></div> <div class="subsection"><h4 id="SSL_Support_-_Connector_-_APR/Native_(deprecated)">SSL Support - Connector - APR/Native (deprecated)</h4><div class="text"> <p>When APR/native is enabled, the HTTPS connector will use a socket poller for keep-alive, increasing scalability of the server. It also uses OpenSSL, which may be more optimized than JSSE depending on the processor being used, and can be complemented with many commercial accelerator components. Unlike the HTTP connector, the HTTPS connector cannot use sendfile to optimize static file processing.</p> <p>The HTTPS APR/native connector has the same attributes than the HTTP APR/native connector, but adds OpenSSL specific ones. For the full details on using OpenSSL, please refer to OpenSSL documentations and the many books available for it (see the <a href="http://www.openssl.org">Official OpenSSL website</a>). The SSL specific attributes for the APR/native connector are: </p> <table class="defaultTable"><tr><th style="width: 15%;"> Attribute </th><th style="width: 85%;"> Description </th></tr><tr><td><code class="attributeName">SSLCACertificateFile</code></td><td> <p>This is an alias for the <code>caCertificateFile</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">SSLCACertificatePath</code></td><td> <p>This is an alias for the <code>caCertificatePath</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">SSLCARevocationFile</code></td><td> <p>This is an alias for the <code>certificateRevocationListFile</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">SSLCARevocationPath</code></td><td> <p>This is an alias for the <code>certificateRevocationListPath</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><strong><code class="attributeName">SSLCertificateFile</code></strong></td><td> <p>This is an alias for the <code>certificateFile</code> attribute of the first <a href="#SSL_Support_-_Certificate">Certificate</a> element nested in the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_Certificate">Certificate</a> and/or <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, they will be created.</p> </td></tr><tr><td><code class="attributeName">SSLCertificateKeyFile</code></td><td> <p>This is an alias for the <code>certificateKeyFile</code> attribute of the first <a href="#SSL_Support_-_Certificate">Certificate</a> element nested in the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_Certificate">Certificate</a> and/or <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, they will be created.</p> </td></tr><tr><td><code class="attributeName">SSLCipherSuite</code></td><td> <p>This is an alias for the <code>ciphers</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">SSLDisableCompression</code></td><td> <p>This is an alias for the <code>disableCompression</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">SSLHonorCipherOrder</code></td><td> <p>This is an alias for the <code>honorCipherOrder</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">SSLPassword</code></td><td> <p>This is an alias for the <code>certificateKeyPassword</code> attribute of the first <a href="#SSL_Support_-_Certificate">Certificate</a> element nested in the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_Certificate">Certificate</a> and/or <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, they will be created.</p> </td></tr><tr><td><code class="attributeName">SSLProtocol</code></td><td> <p>This is an alias for the <code>protocols</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">SSLVerifyClient</code></td><td> <p>This is an alias for the <code>certificateVerification</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">SSLVerifyDepth</code></td><td> <p>This is an alias for the <code>certificateVerificationDepth</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr><tr><td><code class="attributeName">SSLDisableSessionTickets</code></td><td> <p>This is an alias for the <code>disableSessionTickets</code> attribute of the <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element with the <code>hostName</code> of <code>_default_</code>. If this <a href="#SSL_Support_-_SSLHostConfig">SSLHostConfig</a> element is not explicitly defined, it will be created.</p> </td></tr></table> </div></div> <div class="subsection"><h4 id="Connector_Comparison">Connector Comparison</h4><div class="text"> <p>Below is a small chart that shows how the connectors differ.</p> <table class="defaultTable" style="text-align: center;"> <tr> <th></th> <th style="text-align: center;">Java Nio Connector<br>NIO</th> <th style="text-align: center;">Java Nio2 Connector<br>NIO2</th> <th style="text-align: center;">APR/native Connector<br>APR</th> </tr> <tr> <th>Classname</th> <td><code class="noHighlight">Http11NioProtocol</code></td> <td><code class="noHighlight">Http11Nio2Protocol</code></td> <td><code class="noHighlight">Http11AprProtocol</code></td> </tr> <tr> <th>Tomcat Version</th> <td>since 6.0.x</td> <td>since 8.0.x</td> <td>since 5.5.x</td> </tr> <tr> <th>Support Polling</th> <td>YES</td> <td>YES</td> <td>YES</td> </tr> <tr> <th>Polling Size</th> <td><code class="noHighlight">maxConnections</code></td> <td><code class="noHighlight">maxConnections</code></td> <td><code class="noHighlight">maxConnections</code></td> </tr> <tr> <th>Read Request Headers</th> <td>Non Blocking</td> <td>Non Blocking</td> <td>Non Blocking</td> </tr> <tr> <th>Read Request Body</th> <td>Blocking</td> <td>Blocking</td> <td>Blocking</td> </tr> <tr> <th>Write Response Headers and Body</th> <td>Blocking</td> <td>Blocking</td> <td>Blocking</td> </tr> <tr> <th>Wait for next Request</th> <td>Non Blocking</td> <td>Non Blocking</td> <td>Non Blocking</td> </tr> <tr> <th>SSL Support</th> <td>Java SSL or OpenSSL</td> <td>Java SSL or OpenSSL</td> <td>OpenSSL</td> </tr> <tr> <th>SSL Handshake</th> <td>Non blocking</td> <td>Non blocking</td> <td>Blocking</td> </tr> <tr> <th>Max Connections</th> <td><code class="noHighlight">maxConnections</code></td> <td><code class="noHighlight">maxConnections</code></td> <td><code class="noHighlight">maxConnections</code></td> </tr> </table> </div></div> </div></div></div></div></div><footer><div id="footer"> Copyright © 1999-2024, The Apache Software Foundation <br> Apache Tomcat, Tomcat, Apache, the Apache Tomcat logo and the Apache logo are either registered trademarks or trademarks of the Apache Software Foundation. </div></footer></div></body></html>