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</style></head><body bgcolor="#ffffff" text="#000000" link="#525D76" alink="#525D76" vlink="#525D76"><table border="0" width="100%" cellspacing="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img src="../images/tomcat.gif" align="right" alt="
The Apache Tomcat Servlet/JSP Container
" border="0"></a></td><td><h1><font face="arial,helvetica,sanserif">Apache Tomcat 7</font></h1><font face="arial,helvetica,sanserif">Version 7.0.52, Feb 27 2014</font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img src="../images/asf-logo.gif" align="right" alt="Apache Logo" border="0"></a></td></tr></table><table border="0" width="100%" cellspacing="4"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr noshade size="1"></td></tr><tr><!--LEFT SIDE NAVIGATION--><td width="20%" valign="top" nowrap class="noPrint"><p><strong>Links</strong></p><ul><li><a href="../index.html">Docs Home</a></li><li><a href="index.html">Config Ref. Home</a></li><li><a href="http://wiki.apache.org/tomcat/FAQ">FAQ</a></li><li><a href="#comments_section">User Comments</a></li></ul><p><strong>Top Level Elements</strong></p><ul><li><a href="server.html">Server</a></li><li><a href="service.html">Service</a></li></ul><p><strong>Executors</strong></p><ul><li><a href="executor.html">Executor</a></li></ul><p><strong>Connectors</strong></p><ul><li><a href="http.html">HTTP</a></li><li><a href="ajp.html">AJP</a></li></ul><p><strong>Containers</strong></p><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><p><strong>Nested Components</strong></p><ul><li><a href="globalresources.html">Global Resources</a></li><li><a href="jar-scanner.html">JarScanner</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="valve.html">Valve</a></li></ul><p><strong>Cluster Elements</strong></p><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><p><strong>Other</strong></p><ul><li><a href="filter.html">Filter</a></li><li><a href="systemprops.html">System properties</a></li></ul></td><!--RIGHT SIDE MAIN BODY--><td width="80%" valign="top" align="left" id="mainBody"><h1>The AJP Connector</h1><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Table of Contents"><!--()--></a><a name="Table_of_Contents"><strong>Table of Contents</strong></a></font></td></tr><tr><td><blockquote>
<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_Implementations">Standard Implementations</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="#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="#Proxy_Support">Proxy Support</a></li><li><a href="#Connector_Comparison">Connector Comparison</a></li></ol></li></ul>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote>
<p>The <strong>AJP Connector</strong> element represents a
<strong>Connector</strong> component that communicates with a web
connector via the <code>AJP</code> protocol. This is used for cases
where you wish to invisibly integrate Tomcat into an existing (or new)
Apache installation, and you want Apache to handle the static content
contained in the web application, and/or utilize Apache's SSL
processing.</p>
<p>This connector supports load balancing when used in conjunction with
the <code>jvmRoute</code> attribute of the
<a href="engine.html">Engine</a>.</p>
<p>The native connectors supported with this Tomcat release are:
<ul>
<li>JK 1.2.x with any of the supported servers. See
<a href="http://tomcat.apache.org/connectors-doc/">the JK docs</a>
for details.</li>
<li>mod_proxy on Apache httpd 2.x (included by default in Apache HTTP
Server 2.2), with AJP enabled: see
<a href="http://httpd.apache.org/docs/2.2/mod/mod_proxy_ajp.html">the
httpd docs</a> for details.</li>
</ul>
</p>
<p><b>Other native connectors supporting AJP may work, but are no longer
supported.</b></p>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote>
<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Common Attributes"><!--()--></a><a name="Common_Attributes"><strong>Common Attributes</strong></a></font></td></tr><tr><td><blockquote>
<p>All implementations of <strong>Connector</strong>
support the following attributes:</p>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="attributeName">allowTrace</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">asyncTimeout</code></td><td align="left" valign="center">
<p>The default timeout for asynchronous requests in milliseconds. If not
specified, this attribute is set to 10000 (10 seconds).</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">enableLookups</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">maxHeaderCount</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">maxParameterCount</code></td><td align="left" valign="center">
<p>The maximum number of parameter and value pairs (GET plus POST) which
will be automatically parsed by the container. Parameter and value pairs
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 hit the limit.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">maxPostSize</code></td><td align="left" valign="center">
<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 or equal to 0.
If not specified, this attribute is set to 2097152 (2 megabytes).</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">maxSavePostSize</code></td><td align="left" valign="center">
<p>The maximum size in bytes of the POST which will be saved/buffered by
the container during FORM or CLIENT-CERT authentication. For both types
of authentication, the POST will be saved/buffered before the user is
authenticated. For CLIENT-CERT authentication, the POST 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. The limit can be disabled by setting this
attribute to -1. Setting the attribute to zero will disable the saving of
POST data during authentication. If not specified, this attribute is set
to 4096 (4 kilobytes).</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">parseBodyMethods</code></td><td align="left" valign="center">
<p>A comma-separated list of HTTP methods for which request
bodies 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 align="left" valign="center"><strong><code class="attributeName">port</code></strong></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">protocol</code></td><td align="left" valign="center">
<p>Sets the protocol to handle incoming traffic. To configure an AJP
connector this must be specified. If no value for protocol is provided,
an <a href="http.html">HTTP connector</a> rather than an AJP connector
will be configured.<br>
The standard protocol value for an AJP connector is <code>AJP/1.3</code>
which uses an auto-switching mechanism to select either a Java 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, the
native/APR connector will be used. If the native library cannot be
found, the Java based connector will be used.<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.ajp.AjpProtocol</code>
- blocking Java connector<br>
<code>org.apache.coyote.ajp.AjpNioProtocol</code>
- non blocking Java connector.<br>
<code>org.apache.coyote.ajp.AjpAprProtocol</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.
</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">proxyName</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">proxyPort</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">redirectPort</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">scheme</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">secure</code></td><td align="left" valign="center">
<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, a SSL appliance or even a webserver.
The default value is <code>false</code>.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">URIEncoding</code></td><td align="left" valign="center">
<p>This specifies the character encoding used to decode the URI bytes,
after %xx decoding the URL. If not specified, ISO-8859-1 will be used.
</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">useBodyEncodingForURI</code></td><td align="left" valign="center">
<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>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">useIPVHosts</code></td><td align="left" valign="center">
<p>Set this attribute to <code>true</code> to cause Tomcat to use
the IP address passed by the native web server to determine the Host
to send the request to. The default value is <code>false</code>.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">xpoweredBy</code></td><td align="left" valign="center">
<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>
</blockquote></td></tr></table>
<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Standard Implementations"><!--()--></a><a name="Standard_Implementations"><strong>Standard Implementations</strong></a></font></td></tr><tr><td><blockquote>
<p>To use AJP, you must specify the protocol attribute (see above).</p>
<p>The standard AJP connectors (BIO, NIO and APR/native) all support the
following attributes in addition to the common Connector attributes listed
above.</p>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="attributeName">acceptCount</code></td><td align="left" valign="center">
<p>The maximum queue length for incoming connection requests when
all possible request processing threads are in use. Any requests
received when the queue is full will be refused. The default
value is 100.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">acceptorThreadCount</code></td><td align="left" valign="center">
<p>The number of threads to be used to accept connections. Increase this
value on a multi CPU machine, although you would never really need more
than <code>2</code>. Also, with a lot of non keep alive connections, you
might want to increase this value as well. Default value is
<code>1</code>.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">acceptorThreadPriority</code></td><td align="left" valign="center">
<p>The priority of the acceptor threads. The threads 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 align="left" valign="center"><code class="attributeName">address</code></td><td align="left" valign="center">
<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, this port will be used on all IP addresses
associated with the server. A value of <code>127.0.0.1</code>
indicates that the Connector will only listen on the loopback
interface.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">bindOnInit</code></td><td align="left" valign="center">
<p>Controls when the socket used by the connector is bound. By default 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.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">clientCertProvider</code></td><td align="left" valign="center">
<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 AJP connectors, the <a href="http.html">HTTP APR connector</a> 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 align="left" valign="center"><code class="attributeName">connectionLinger</code></td><td align="left" valign="center">
<p>The number of seconds during which the sockets used by this
<strong>Connector</strong> will linger when they are closed.
If not specified, the JVM default will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">connectionTimeout</code></td><td align="left" valign="center">
<p>The number of milliseconds this <strong>Connector</strong> will wait,
after accepting a connection, for the request URI line to be
presented. The default value for AJP protocol connectors
is <code>-1</code> (i.e. infinite).</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">executor</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">executorTerminationTimeoutMillis</code></td><td align="left" valign="center">
<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>0</code> (zero)
for the BIO connector and <code>5000</code> (5 seconds) for the NIO and
APR/native connectors.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">keepAliveTimeout</code></td><td align="left" valign="center">
<p>The number of milliseconds this <strong>Connector</strong> will wait for
another AJP request before closing the connection.
The default value is to use the value that has been set for the
connectionTimeout attribute.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">maxConnections</code></td><td align="left" valign="center">
<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 BIO the default is the value of
<strong>maxThreads</strong> unless an <a href="executor.html">Executor</a>
is used in which case the default will be the value of maxThreads from the
executor. For NIO the default is <code>10000</code>.
For APR/native, the default is <code>8192</code>.</p>
<p>Note that for APR/native on Windows, the configured value will be
reduced to the highest multiple of 1024 that is less than or equal to
maxConnections. This is done for performance reasons.<br>
If set to a value of -1, the maxConnections feature is disabled
and connections are not counted.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">maxThreads</code></td><td align="left" valign="center">
<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.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">minSpareThreads</code></td><td align="left" valign="center">
<p>The minimum number of threads always kept running. If not specified,
the default of <code>10</code> is used.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">packetSize</code></td><td align="left" valign="center">
<p>This attribute sets the maximum AJP packet size in Bytes. The maximum
value is 65536. It should be the same as the <code>max_packet_size</code>
directive configured for mod_jk. Normally it is not necessary to change
the maximum packet size. Problems with the default value have been
reported when sending certificates or certificate chains. The default
value is 8192. If set to less than 8192 then the setting will ignored and
the default value of 8192 used.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">processorCache</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">requiredSecret</code></td><td align="left" valign="center">
<p>Only requests from workers with this secret keyword will be accepted.
</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">tcpNoDelay</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">threadPriority</code></td><td align="left" valign="center">
<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.
</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">tomcatAuthentication</code></td><td align="left" valign="center">
<p>If set to <code>true</code>, the authentication will be done in Tomcat.
Otherwise, the authenticated principal will be propagated from the native
webserver and used for authorization in Tomcat.
The default value is <code>true</code>.</p>
</td></tr></table>
</blockquote></td></tr></table>
<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Java TCP socket attributes"><!--()--></a><a name="Java_TCP_socket_attributes"><strong>Java TCP socket attributes</strong></a></font></td></tr><tr><td><blockquote>
<p>The BIO and NIO implementation support the following Java TCP socket
attributes in addition to the common Connector and HTTP attributes listed
above.</p>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="attributeName">socket.rxBufSize</code></td><td align="left" valign="center">
<p>(int)The socket receive buffer (SO_RCVBUF) size in bytes. JVM default
used if not set.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">socket.txBufSize</code></td><td align="left" valign="center">
<p>(int)The socket send buffer (SO_SNDBUF) size in bytes. JVM default
used if not set.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">socket.tcpNoDelay</code></td><td align="left" valign="center">
<p>(bool)This is equivalent to standard attribute
<strong>tcpNoDelay</strong>.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">socket.soKeepAlive</code></td><td align="left" valign="center">
<p>(bool)Boolean value for the socket's keep alive setting
(SO_KEEPALIVE). JVM default used if not set.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">socket.ooBInline</code></td><td align="left" valign="center">
<p>(bool)Boolean value for the socket OOBINLINE setting. JVM default
used if not set.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">socket.soReuseAddress</code></td><td align="left" valign="center">
<p>(bool)Boolean value for the sockets reuse address option
(SO_REUSEADDR). JVM default used if not set.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">socket.soLingerOn</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">socket.soLingerTime</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">socket.soTimeout</code></td><td align="left" valign="center">
<p>This is equivalent to standard attribute
<strong>connectionTimeout</strong>.</p>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">socket.performanceConnectionTime</code></td><td align="left" valign="center">
<p>(int)The first value for the performance settings. See
<a href="http://docs.oracle.com/javase/6/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 align="left" valign="center"><code class="attributeName">socket.performanceLatency</code></td><td align="left" valign="center">
<p>(int)The second value for the performance settings. See
<a href="http://docs.oracle.com/javase/6/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 align="left" valign="center"><code class="attributeName">socket.performanceBandwidth</code></td><td align="left" valign="center">
<p>(int)The third value for the performance settings. See
<a href="http://docs.oracle.com/javase/6/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 align="left" valign="center"><code class="attributeName">socket.unlockTimeout</code></td><td align="left" valign="center">
<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>
</blockquote></td></tr></table>
<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="NIO specific configuration"><!--()--></a><a name="NIO_specific_configuration"><strong>NIO specific configuration</strong></a></font></td></tr><tr><td><blockquote>
<p>The following attributes are specific to the NIO connector.</p>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="attributeName">socket.directBuffer</code></td><td align="left" valign="center">
<p>(bool)Boolean value, whether to use direct ByteBuffers or java mapped
ByteBuffers. Default 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 align="left" valign="center"><code class="attributeName">socket.appReadBufSize</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">socket.appWriteBufSize</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">socket.bufferPool</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">socket.bufferPoolSize</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">socket.processorCache</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">socket.keyCache</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">socket.eventCache</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">selectorPool.maxSelectors</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">selectorPool.maxSpareSelectors</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">command-line-options</code></td><td align="left" valign="center">
<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>
</blockquote></td></tr></table>
<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="APR/native specific configuration"><!--()--></a><a name="APR/native_specific_configuration"><strong>APR/native specific configuration</strong></a></font></td></tr><tr><td><blockquote>
<p>The APR/native implementation supports the following attributes in
addition to the common Connector and AJP attributes listed above.</p>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="attributeName">pollTime</code></td><td align="left" valign="center">
<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 align="left" valign="center"><code class="attributeName">pollerSize</code></td><td align="left" valign="center">
<p>Amount of sockets that the poller responsible for polling kept alive
connections can hold at a given time. Extra connections will be closed
right away. The default value is 8192, corresponding to 8192 keep-alive
connections.</p>
</td></tr></table>
</blockquote></td></tr></table>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Nested Components"><!--()--></a><a name="Nested_Components"><strong>Nested Components</strong></a></font></td></tr><tr><td><blockquote>
<p>None at this time.</p>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Special Features"><!--()--></a><a name="Special_Features"><strong>Special Features</strong></a></font></td></tr><tr><td><blockquote>
<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Proxy Support"><!--()--></a><a name="Proxy_Support"><strong>Proxy Support</strong></a></font></td></tr><tr><td><blockquote>
<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>
</blockquote></td></tr></table>
<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Connector Comparison"><!--()--></a><a name="Connector_Comparison"><strong>Connector Comparison</strong></a></font></td></tr><tr><td><blockquote>
<p>Below is a small chart that shows how the connectors differentiate.</p>
<div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="../images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="../images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>
Java Blocking Connector Java Nio Blocking Connector APR/native Connector
BIO NIO APR
Classname AjpProtocol AjpNioProtocol AjpAprProtocol
Tomcat Version 3.x onwards 7.x onwards 5.5.x onwards
Support Polling NO YES YES
Polling Size N/A maxConnections maxConnections
Read Request Headers Blocking Sim Blocking Blocking
Read Request Body Blocking Sim Blocking Blocking
Write Response Blocking Sim Blocking Blocking
Wait for next Request Blocking Non Blocking Non Blocking
Max Connections maxConnections maxConnections maxConnections
</pre></td><td bgcolor="#023264" width="1"><img src="../images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="../images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="../images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="../images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>
</blockquote></td></tr></table>
</blockquote></td></tr></table></td></tr><tr class="noPrint"><td width="20%" valign="top" nowrap class="noPrint"></td><td width="80%" valign="top" align="left"><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="comments_section" id="comments_section"><strong>Comments</strong></a></font></td></tr><tr><td><blockquote><p class="notice"><strong>Notice: </strong>This comments section collects your suggestions
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