| 1 | <html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat Configuration Reference - The HTTP Connector</title><meta value="Craig R. McClanahan" name="author"><meta value="craigmcc@apache.org" name="email"><meta value="Yoav Shapira" name="author"><meta value="yoavs@apache.org" name="email"></head><body vlink="#525D76" alink="#525D76" link="#525D76" text="#000000" bgcolor="#ffffff"><table cellspacing="0" width="100%" border="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img border="0" alt=" |
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| 2 | The Apache Tomcat Servlet/JSP Container |
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| 3 | " align="right" src="../../images/tomcat.gif"></a></td><td><font face="arial,helvetica,sanserif"><h1>Apache Tomcat 6.0</h1></font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img border="0" alt="Apache Logo" align="right" src="../../images/asf-logo.gif"></a></td></tr></table><table cellspacing="4" width="100%" border="0"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr size="1" noshade></td></tr><tr><!--RIGHT SIDE MAIN BODY--><td align="left" valign="top" width="80%"><table cellspacing="4" width="100%" border="0"><tr><td valign="top" align="left"><h1>Apache Tomcat Configuration Reference</h1><h2>The HTTP Connector</h2></td><td nowrap="true" valign="top" align="right"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote> |
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| 4 | |
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| 5 | <p>The <strong>HTTP Connector</strong> element represents a |
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| 6 | <strong>Connector</strong> component that supports the HTTP/1.1 protocol. |
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| 7 | It enables Catalina to function as a stand-alone web server, in addition |
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| 8 | to its ability to execute servlets and JSP pages. A particular instance |
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| 9 | of this component listens for connections on a specific TCP port number |
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| 10 | on the server. One or more such <strong>Connectors</strong> can be |
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| 11 | configured as part of a single <a href="service.html">Service</a>, each |
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| 12 | forwarding to the associated <a href="engine.html">Engine</a> to perform |
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| 13 | request processing and create the response.</p> |
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| 14 | |
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| 15 | <p>If you wish to configure the <strong>Connector</strong> that is used |
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| 16 | for connections to web servers using the AJP protocol (such as the |
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| 17 | <code>mod_jk 1.2.x</code> connector for Apache 1.3), see |
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| 18 | <a href="ajp.html">here</a> instead.</p> |
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| 19 | |
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| 20 | <p>Each incoming request requires |
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| 21 | a thread for the duration of that request. If more simultaneous requests |
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| 22 | are received than can be handled by the currently available request |
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| 23 | processing threads, additional threads will be created up to the |
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| 24 | configured maximum (the value of the <code>maxThreads</code> attribute). |
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| 25 | If still more simultaneous requests are received, they are stacked up |
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| 26 | inside the server socket created by the <strong>Connector</strong>, up to |
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| 27 | the configured maximum (the value of the <code>acceptCount</code> |
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| 28 | attribute. Any further simultaneous requests will receive "connection |
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| 29 | refused" errors, until resources are available to process them.</p> |
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| 30 | |
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| 31 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote> |
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| 32 | |
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| 33 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Common Attributes"><strong>Common Attributes</strong></a></font></td></tr><tr><td><blockquote> |
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| 34 | |
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| 35 | <p>All implementations of <strong>Connector</strong> |
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| 36 | support the following attributes:</p> |
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| 37 | |
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| 38 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><code>allowTrace</code></td><td valign="center" align="left"> |
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| 39 | <p>A boolean value which can be used to enable or disable the TRACE |
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| 40 | HTTP method. If not specified, this attribute is set to false.</p> |
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| 41 | </td></tr><tr><td valign="center" align="left"><code>emptySessionPath</code></td><td valign="center" align="left"> |
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| 42 | <p>If set to <code>true</code>, all paths for session cookies will be set |
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| 43 | to <code>/</code>. This can be useful for portlet specification implementations. |
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| 44 | If not specified, this attribute is set to <code>false</code>.</p> |
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| 45 | </td></tr><tr><td valign="center" align="left"><code>enableLookups</code></td><td valign="center" align="left"> |
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| 46 | <p>Set to <code>true</code> if you want calls to |
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| 47 | <code>request.getRemoteHost()</code> to perform DNS lookups in |
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| 48 | order to return the actual host name of the remote client. Set |
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| 49 | to <code>false</code> to skip the DNS lookup and return the IP |
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| 50 | address in String form instead (thereby improving performance). |
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| 51 | By default, DNS lookups are enabled.</p> |
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| 52 | </td></tr><tr><td valign="center" align="left"><code>maxPostSize</code></td><td valign="center" align="left"> |
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| 53 | <p>The maximum size in bytes of the POST which will be handled by |
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| 54 | the container FORM URL parameter parsing. The limit can be disabled by |
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| 55 | setting this attribute to a value less than or equal to 0. |
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| 56 | If not specified, this attribute is set to 2097152 (2 megabytes).</p> |
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| 57 | </td></tr><tr><td valign="center" align="left"><code>maxSavePostSize</code></td><td valign="center" align="left"> |
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| 58 | <p>The maximum size in bytes of the POST which will be saved/buffered by |
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| 59 | the container during FORM or CLIENT-CERT authentication. For both types |
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| 60 | of authentication, the POST will be saved/buffered before the user is |
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| 61 | authenticated. For CLIENT-CERT authentication, the POST is buffered for |
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| 62 | the duration of |
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| 63 | the SSL handshake and the buffer emptied when the request |
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| 64 | is processed. For FORM authentication the POST is |
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| 65 | saved whilst the user |
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| 66 | is re-directed to the login form and is retained until the user |
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| 67 | successfully authenticates or the session associated with the |
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| 68 | authentication request expires. The limit can be disabled by setting this |
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| 69 | attribute to -1. Setting the attribute to |
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| 70 | zero will disable the saving of |
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| 71 | POST data during authentication |
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| 72 | . If not |
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| 73 | specified, this attribute is set |
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| 74 | to |
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| 75 | 4096 (4 kilobytes).</p> |
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| 76 | </td></tr><tr><td valign="center" align="left"><code>protocol</code></td><td valign="center" align="left"> |
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| 77 | <p> |
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| 78 | Sets the protocol to handle incoming traffic. |
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| 79 | The default value is <code>HTTP/1.1</code> and configures the |
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| 80 | <code>org.apache.coyote.http11.Http11Protocol</code>. This is the blocking Java connector.<br> |
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| 81 | If the <code>PATH(Windows)</code> or <code>LD_LIBRARY_PATH(on most unix system)</code> |
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| 82 | environment variables contain the Tomcat native library, the APR connector |
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| 83 | will automatically be configured. Please be advised that the APR connector has different |
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| 84 | settings for HTTPS than the default Java connector.<br> |
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| 85 | Other values for this attribute are, but not limited to:<br> |
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| 86 | <code>org.apache.coyote.http11.Http11Protocol</code> - same as HTTP/1.1<br> |
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| 87 | <code>org.apache.coyote.http11.Http11NioProtocol</code> - non blocking Java connector<br> |
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| 88 | <code>org.apache.coyote.http11.Http11AprProtocol</code> - the APR connector.<br> |
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| 89 | Take a look at our <a href="#Connector Comparison">Connector Comparison</a> chart. |
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| 90 | The configuration for both Java connectors are identical, both for http and https. <br> |
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| 91 | For more information on the APR connector and APR specific SSL settings please |
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| 92 | visit the <a href="../../apr.html">APR documentation</a> |
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| 93 | |
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| 94 | </p> |
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| 95 | </td></tr><tr><td valign="center" align="left"><code>proxyName</code></td><td valign="center" align="left"> |
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| 96 | <p>If this <strong>Connector</strong> is being used in a proxy |
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| 97 | configuration, configure this attribute to specify the server name |
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| 98 | to be returned for calls to <code>request.getServerName()</code>. |
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| 99 | See <a href="#Proxy Support">Proxy Support</a> for more |
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| 100 | information.</p> |
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| 101 | </td></tr><tr><td valign="center" align="left"><code>proxyPort</code></td><td valign="center" align="left"> |
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| 102 | <p>If this <strong>Connector</strong> is being used in a proxy |
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| 103 | configuration, configure this attribute to specify the server port |
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| 104 | to be returned for calls to <code>request.getServerPort()</code>. |
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| 105 | See <a href="#Proxy Support">Proxy Support</a> for more |
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| 106 | information.</p> |
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| 107 | </td></tr><tr><td valign="center" align="left"><code>redirectPort</code></td><td valign="center" align="left"> |
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| 108 | <p>If this <strong>Connector</strong> is supporting non-SSL |
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| 109 | requests, and a request is received for which a matching |
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| 110 | <code><security-constraint></code> requires SSL transport, |
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| 111 | Catalina will automatically redirect the request to the port |
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| 112 | number specified here.</p> |
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| 113 | </td></tr><tr><td valign="center" align="left"><code>SSLEnabled</code></td><td valign="center" align="left"> |
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| 114 | <p> |
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| 115 | Use this attribute to enable SSL traffic on a connector. |
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| 116 | To turn on SSL handshake/encryption/decryption on a connector |
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| 117 | set this value to <code>true</code>. |
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| 118 | The default value is <code>false</code>. |
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| 119 | When turning this value <code>true</code> you will want to set the |
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| 120 | <code>scheme</code> and the <code>secure</code> attributes as well |
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| 121 | to pass the correct <code>request.getScheme()</code> and |
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| 122 | <code>request.isSecure()</code> values to the servlets |
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| 123 | See <a href="#SSL Support">SSL Support</a> for more information. |
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| 124 | </p> |
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| 125 | </td></tr><tr><td valign="center" align="left"><code>scheme</code></td><td valign="center" align="left"> |
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| 126 | <p>Set this attribute to the name of the protocol you wish to have |
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| 127 | returned by calls to <code>request.getScheme()</code>. For |
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| 128 | example, you would set this attribute to "<code>https</code>" |
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| 129 | for an SSL Connector. The default value is "<code>http</code>". |
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| 130 | </p> |
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| 131 | </td></tr><tr><td valign="center" align="left"><code>secure</code></td><td valign="center" align="left"> |
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| 132 | <p>Set this attribute to <code>true</code> if you wish to have |
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| 133 | calls to <code>request.isSecure()</code> to return <code>true</code> |
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| 134 | for requests received by this Connector. You would want this on an |
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| 135 | SSL Connector or a non SSL connector that is receiving data from a |
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| 136 | SSL accelerator, like a crypto card, a SSL appliance or even a webserver. |
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| 137 | The default value is <code>false</code>.</p> |
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| 138 | </td></tr><tr><td valign="center" align="left"><code>URIEncoding</code></td><td valign="center" align="left"> |
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| 139 | <p>This specifies the character encoding used to decode the URI bytes, |
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| 140 | after %xx decoding the URL. If not specified, ISO-8859-1 will be used. |
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| 141 | </p> |
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| 142 | </td></tr><tr><td valign="center" align="left"><code>useBodyEncodingForURI</code></td><td valign="center" align="left"> |
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| 143 | <p>This specifies if the encoding specified in contentType should be used |
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| 144 | for URI query parameters, instead of using the URIEncoding. This |
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| 145 | setting is present for compatibility with Tomcat 4.1.x, where the |
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| 146 | encoding specified in the contentType, or explicitely set using |
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| 147 | Request.setCharacterEncoding method was also used for the parameters from |
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| 148 | the URL. The default value is <code>false</code>. |
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| 149 | </p> |
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| 150 | </td></tr><tr><td valign="center" align="left"><code>useIPVHosts</code></td><td valign="center" align="left"> |
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| 151 | <p>Set this attribute to <code>true</code> to cause Tomcat to use |
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| 152 | the IP address that the request was recieved on to determine the Host |
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| 153 | to send the request to. The default value is <code>false</code>.</p> |
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| 154 | </td></tr><tr><td valign="center" align="left"><code>xpoweredBy</code></td><td valign="center" align="left"> |
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| 155 | <p>Set this attribute to <code>true</code> to cause Tomcat to advertise |
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| 156 | support for the Servlet specification using the header recommended in the |
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| 157 | specification. The default value is <code>false</code>.</p> |
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| 158 | </td></tr></table> |
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| 159 | |
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| 160 | </blockquote></td></tr></table> |
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| 161 | |
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| 162 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Standard Implementation"><strong>Standard Implementation</strong></a></font></td></tr><tr><td><blockquote> |
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| 163 | |
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| 164 | <p> |
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| 165 | HTTP supports the following additional attributes (in addition to the |
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| 166 | common attributes listed above):</p> |
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| 167 | |
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| 168 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><code>acceptCount</code></td><td valign="center" align="left"> |
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| 169 | <p>The maximum queue length for incoming connection requests when |
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| 170 | all possible request processing threads are in use. Any requests |
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| 171 | received when the queue is full will be refused. The default |
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| 172 | value is 10.</p> |
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| 173 | </td></tr><tr><td valign="center" align="left"><code>address</code></td><td valign="center" align="left"> |
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| 174 | <p>For servers with more than one IP address, this attribute |
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| 175 | specifies which address will be used for listening on the specified |
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| 176 | port. By default, this port will be used on all IP addresses |
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| 177 | associated with the server.</p> |
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| 178 | </td></tr><tr><td valign="center" align="left"><code>bufferSize</code></td><td valign="center" align="left"> |
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| 179 | <p>The size (in bytes) of the buffer to be provided for input |
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| 180 | streams created by this connector. By default, buffers of |
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| 181 | 2048 bytes will be provided.</p> |
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| 182 | </td></tr><tr><td valign="center" align="left"><code>compressableMimeType</code></td><td valign="center" align="left"> |
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| 183 | <p>The value is a comma separated list of MIME types for which HTTP |
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| 184 | compression may be used. |
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| 185 | The default value is <code>text/html,text/xml,text/plain</code>.</p> |
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| 186 | </td></tr><tr><td valign="center" align="left"><code>compression</code></td><td valign="center" align="left"> |
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| 187 | <p>The <strong>Connector</strong> may use HTTP/1.1 GZIP compression in |
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| 188 | an attempt to save server bandwidth. The acceptable values for the |
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| 189 | parameter is "off" (disable compression), "on" (allow compression, which |
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| 190 | causes text data to be compressed), "force" (forces compression in all |
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| 191 | cases), or a numerical integer value (which is equivalent to "on", but |
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| 192 | specifies the minimum amount of data before the output is compressed). If |
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| 193 | the content-length is not known and compression is set to "on" or more |
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| 194 | aggressive, the output will also be compressed. If not specified, this |
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| 195 | attribute is set to "off".</p> |
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| 196 | </td></tr><tr><td valign="center" align="left"><code>connectionLinger</code></td><td valign="center" align="left"> |
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| 197 | <p>The number of milliseconds during which the sockets used by this |
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| 198 | <strong>Connector</strong> will linger when they are closed. |
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| 199 | The default value is -1 (socket linger is disabled).</p> |
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| 200 | </td></tr><tr><td valign="center" align="left"><code>connectionTimeout</code></td><td valign="center" align="left"> |
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| 201 | <p>The number of milliseconds this <strong>Connector</strong> will wait, |
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| 202 | after accepting a connection, for the request URI line to be |
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| 203 | presented. The default value is 60000 (i.e. 60 seconds).</p> |
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| 204 | </td></tr><tr><td valign="center" align="left"><code>executor</code></td><td valign="center" align="left"> |
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| 205 | <p>A reference to the name in an <a href="executor.html">Executor</a> element. |
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| 206 | If this attribute is enabled, and the named executor exists, the connector will |
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| 207 | use the executor, and all the other thread attributes will be ignored.</p> |
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| 208 | </td></tr><tr><td valign="center" align="left"><code>keepAliveTimeout</code></td><td valign="center" align="left"> |
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| 209 | <p>The number of milliseconds this <strong>Connector</strong> will wait for |
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| 210 | another HTTP request before closing the connection. |
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| 211 | The default value is to use the value that has been set for the |
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| 212 | connectionTimeout attribute.</p> |
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| 213 | </td></tr><tr><td valign="center" align="left"><code>disableUploadTimeout</code></td><td valign="center" align="left"> |
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| 214 | <p>This flag allows the servlet container to use a different, longer |
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| 215 | connection timeout while a servlet is being executed, which in the end |
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| 216 | allows either the servlet a longer amount of time to complete its |
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| 217 | execution, or a longer timeout during data upload. If not specified, |
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| 218 | this attribute is set to "true".</p> |
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| 219 | </td></tr><tr><td valign="center" align="left"><code>maxHttpHeaderSize</code></td><td valign="center" align="left"> |
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| 220 | <p>The maximum size of the request and response HTTP header, specified |
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| 221 | in bytes. |
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| 222 | If not specified, this attribute is set to 4096 (4 KB).</p> |
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| 223 | </td></tr><tr><td valign="center" align="left"><code>maxKeepAliveRequests</code></td><td valign="center" align="left"> |
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| 224 | <p>The maximum number of HTTP requests which can be pipelined until |
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| 225 | the connection is closed by the server. Setting this attribute to 1 will |
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| 226 | disable HTTP/1.0 keep-alive, as well as HTTP/1.1 keep-alive and |
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| 227 | pipelining. Setting this to -1 will allow an unlimited amount of |
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| 228 | pipelined or keep-alive HTTP requests. |
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| 229 | If not specified, this attribute is set to 100.</p> |
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| 230 | </td></tr><tr><td valign="center" align="left"><code>maxThreads</code></td><td valign="center" align="left"> |
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| 231 | <p>The maximum number of request processing threads to be created |
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| 232 | by this <strong>Connector</strong>, which therefore determines the |
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| 233 | maximum number of simultaneous requests that can be handled. If |
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| 234 | not specified, this attribute is set to 40. If an executor is associated |
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| 235 | with this connector, this attribute is ignored as the connector will |
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| 236 | execute tasks using the executor rather than an internal thread pool.</p> |
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| 237 | </td></tr><tr><td valign="center" align="left"><code>noCompressionUserAgents</code></td><td valign="center" align="left"> |
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| 238 | <p>The value is a comma separated list of regular expressions matching |
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| 239 | user-agents of HTTP clients for which compression should not be used, |
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| 240 | because these clients, although they do advertise support for the |
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| 241 | feature, have a broken implementation. |
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| 242 | The default value is an empty String (regexp matching disabled).</p> |
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| 243 | </td></tr><tr><td valign="center" align="left"><strong><code>port</code></strong></td><td valign="center" align="left"> |
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| 244 | <p>The TCP port number on which this <strong>Connector</strong> |
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| 245 | will create a server socket and await incoming connections. Your |
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| 246 | operating system will allow only one server application to listen |
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| 247 | to a particular port number on a particular IP address.</p> |
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| 248 | </td></tr><tr><td valign="center" align="left"><code>restrictedUserAgents</code></td><td valign="center" align="left"> |
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| 249 | <p>The value is a comma separated list of regular expressions matching |
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| 250 | user-agents of HTTP clients for which HTTP/1.1 or HTTP/1.0 keep alive |
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| 251 | should not be used, even if the clients advertise support for these |
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| 252 | features. |
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| 253 | The default value is an empty String (regexp matching disabled).</p> |
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| 254 | </td></tr><tr><td valign="center" align="left"><code>server</code></td><td valign="center" align="left"> |
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| 255 | <p>The Server header for the http response. |
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| 256 | Unless you are paranoid, you won't need this feature. |
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| 257 | </p> |
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| 258 | </td></tr><tr><td valign="center" align="left"><code>socketBuffer</code></td><td valign="center" align="left"> |
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| 259 | <p>The size (in bytes) of the buffer to be provided for socket |
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| 260 | output buffering. -1 can be specified to disable the use of a buffer. |
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| 261 | By default, a buffers of 9000 bytes will be used.</p> |
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| 262 | </td></tr><tr><td valign="center" align="left"><code>tcpNoDelay</code></td><td valign="center" align="left"> |
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| 263 | <p>If set to <code>true</code>, the TCP_NO_DELAY option will be |
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| 264 | set on the server socket, which improves performance under most |
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| 265 | circumstances. This is set to <code>true</code> by default.</p> |
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| 266 | </td></tr><tr><td valign="center" align="left"><code>threadPriority</code></td><td valign="center" align="left"> |
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| 267 | <p>The priority of the request processing threads within the JVM. |
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| 268 | The default value is <code>java.lang.Thread#NORM_PRIORITY</code>. |
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| 269 | See the JavaDoc for the java.lang.Thread class for more details on |
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| 270 | what this priority means. |
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| 271 | </p> |
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| 272 | </td></tr></table> |
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| 273 | |
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| 274 | </blockquote></td></tr></table> |
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| 275 | |
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| 276 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Nio Implementation"><strong>Nio Implementation</strong></a></font></td></tr><tr><td><blockquote> |
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| 277 | |
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| 278 | <p>The NIO connector exposes all the low level socket properties that can be used to tune the connector. |
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| 279 | Most of these attributes are directly linked to the socket implementation in the JDK so you can find out |
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| 280 | about the actual meaning in the JDK API documentation.<br> |
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| 281 | <strong>Note</strong>On some JDK versions, setTrafficClass causes a problem, a work around for this is to add |
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| 282 | the <code>-Djava.net.preferIPv4Stack=true</code> value to your command line</p> |
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| 283 | |
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| 284 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><code>useSendfile</code></td><td valign="center" align="left"> |
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| 285 | <p>(bool)Use this attribute to enable or disable sendfile capability. |
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| 286 | The default value is <code>true</code> |
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| 287 | </p> |
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| 288 | </td></tr><tr><td valign="center" align="left"><code>useExecutor</code></td><td valign="center" align="left"> |
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| 289 | <p>(bool)Set to true to use the NIO thread pool executor. The default value is <code>true</code>. |
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| 290 | If set to false, it uses a thread pool based on a stack for its execution. |
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| 291 | Generally, using the executor yields a little bit slower performance, but yields a better |
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| 292 | fairness for processing connections in a high load environment as the traffic gets queued through a |
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| 293 | FIFO queue. If set to true(default) then the max pool size is the <code>maxThreads</code> attribute |
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| 294 | and the core pool size is the <code>minSpareThreads</code>. |
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| 295 | This value is ignored if the <code>executor</code> attribute is present and points to a valid shared thread pool. |
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| 296 | </p> |
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| 297 | </td></tr><tr><td valign="center" align="left"><code>acceptorThreadCount</code></td><td valign="center" align="left"> |
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| 298 | <p>(int)The number of threads to be used to accept connections. Increase this value on a multi CPU machine, |
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| 299 | although you would never really need more than <code>2</code>. Also, with a lot of non keep alive connections, |
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| 300 | you might want to increase this value as well. Default value is <code>1</code>.</p> |
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| 301 | </td></tr><tr><td valign="center" align="left"><code>pollerThreadCount</code></td><td valign="center" align="left"> |
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| 302 | <p>(int)The number of threads to be used to run for the polling events. Default value is <code>1</code>. |
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| 303 | Can't see a reason to go above that. But experiment and find your own results.</p> |
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| 304 | </td></tr><tr><td valign="center" align="left"><code>pollerThreadPriority</code></td><td valign="center" align="left"> |
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| 305 | <p>(int)The priority of the poller threads. |
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| 306 | The default value is <code>java.lang.Thread#NORM_PRIORITY</code>. |
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| 307 | See the JavaDoc for the java.lang.Thread class for more details on |
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| 308 | what this priority means. |
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| 309 | </p> |
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| 310 | </td></tr><tr><td valign="center" align="left"><code>acceptorThreadPriority</code></td><td valign="center" align="left"> |
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| 311 | <p>(int)The priority of the acceptor threads. The threads used to accept new connections. |
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| 312 | The default value is <code>java.lang.Thread#NORM_PRIORITY</code>. |
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| 313 | See the JavaDoc for the java.lang.Thread class for more details on |
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| 314 | what this priority means. |
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| 315 | </p> |
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| 316 | </td></tr><tr><td valign="center" align="left"><code>selectorTimeout</code></td><td valign="center" align="left"> |
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| 317 | <p>(int)The time in milliseconds to timeout on a select() for the poller. |
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| 318 | This value is important, since connection clean up is done on the same thread, so dont set this |
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| 319 | value to an extremely high one. The default value is <code>1000</code> milliseconds.</p> |
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| 320 | </td></tr><tr><td valign="center" align="left"><code>useComet</code></td><td valign="center" align="left"> |
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| 321 | <p>(bool)Whether to allow comet servlets or not, Default value is <code>true</code>.</p> |
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| 322 | </td></tr><tr><td valign="center" align="left"><code>processCache</code></td><td valign="center" align="left"> |
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| 323 | <p>(int)The protocol handler caches Http11NioProcessor objects to speed up performance. |
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| 324 | This setting dictates how many of these objects get cached. |
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| 325 | <code>-1</code> means unlimited, default is <code>200</code>. Set this value somewhere close to your maxThreads value. |
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| 326 | </p> |
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| 327 | </td></tr><tr><td valign="center" align="left"><code>socket.directBuffer</code></td><td valign="center" align="left"> |
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| 328 | <p>(bool)Boolean value, whether to use direct ByteBuffers or java mapped ByteBuffers. Default is <code>false</code> |
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| 329 | <br>When you are using direct buffers, make sure you allocate the appropriate amount of memory for the |
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| 330 | direct memory space. On Sun's JDK that would be something like <code>-XX:MaxDirectMemorySize=256m</code></p> |
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| 331 | </td></tr><tr><td valign="center" align="left"><code>socket.rxBufSize</code></td><td valign="center" align="left"> |
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| 332 | <p>(int)The socket receive buffer (SO_RCVBUF) size in bytes. Default value is <code>25188</code></p> |
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| 333 | </td></tr><tr><td valign="center" align="left"><code>socket.txBufSize</code></td><td valign="center" align="left"> |
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| 334 | <p>(int)The socket send buffer (SO_SNDBUF) size in bytes. Default value is <code>43800</code></p> |
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| 335 | </td></tr><tr><td valign="center" align="left"><code>socket.appReadBufSize</code></td><td valign="center" align="left"> |
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| 336 | <p>(int)Each connection that is opened up in Tomcat get associated with a read and a write ByteBuffer |
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| 337 | This attribute controls the size of these buffers. By default this read buffer is sized at <code>8192</code> bytes. |
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| 338 | For lower concurrency, you can increase this to buffer more data. |
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| 339 | For an extreme amount of keep alive connections, decrease this number or increase your heap size.</p> |
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| 340 | </td></tr><tr><td valign="center" align="left"><code>socket.appWriteBufSize</code></td><td valign="center" align="left"> |
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| 341 | <p>(int)Each connection that is opened up in Tomcat get associated with a read and a write ByteBuffer |
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| 342 | This attribute controls the size of these buffers. By default this write buffer is sized at <code>8192</code> bytes. |
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| 343 | For low concurrency you can increase this to buffer more response data. |
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| 344 | For an extreme amount of keep alive connections, decrease this number or increase your heap size. |
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| 345 | <br> |
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| 346 | The default value here is pretty low, you should up it if you are not dealing with tens of thousands |
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| 347 | concurrent connections.</p> |
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| 348 | </td></tr><tr><td valign="center" align="left"><code>socket.bufferPool</code></td><td valign="center" align="left"> |
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| 349 | <p>(int)The Nio connector uses a class called NioChannel that holds elements linked to a socket. |
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| 350 | To reduce garbage collection, the Nio connector caches these channel objects. |
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| 351 | This value specifies the size of this cache. |
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| 352 | The default value is <code>500</code>, and represents that the cache will hold 500 NioChannel objects. |
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| 353 | Other values are <code>-1</code>. unlimited cache, and <code>0</code>, no cache.</p> |
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| 354 | </td></tr><tr><td valign="center" align="left"><code>socket.bufferPoolSize</code></td><td valign="center" align="left"> |
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| 355 | <p>(int)The NioChannel pool can also be size based, not used object based. The size is calculated as follows:<br> |
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| 356 | NioChannel <code>buffer size = read buffer size + write buffer size</code><br> |
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| 357 | SecureNioChannel <code>buffer size = application read buffer size + application write buffer size + network read buffer size + network write buffer size</code><br> |
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| 358 | The value is in bytes, the default value is <code>1024*1024*100</code> (100MB) |
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| 359 | </p> |
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| 360 | </td></tr><tr><td valign="center" align="left"><code>socket.processorCache</code></td><td valign="center" align="left"> |
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| 361 | <p>(int)Tomcat will cache SocketProcessor objects to reduce garbage collection. |
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| 362 | The integer value specifies how many objects to keep in the cache at most. |
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| 363 | The default is <code>500</code>. |
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| 364 | Other values are <code>-1</code>. unlimited cache, and <code>0</code>, no cache.</p> |
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| 365 | </td></tr><tr><td valign="center" align="left"><code>socket.keyCache</code></td><td valign="center" align="left"> |
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| 366 | <p>(int)Tomcat will cache KeyAttachment objects to reduce garbage collection. |
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| 367 | The integer value specifies how many objects to keep in the cache at most. |
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| 368 | The default is <code>500</code>. |
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| 369 | Other values are <code>-1</code>. unlimited cache, and <code>0</code>, no cache.</p> |
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| 370 | </td></tr><tr><td valign="center" align="left"><code>socket.eventCache</code></td><td valign="center" align="left"> |
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| 371 | <p>(int)Tomcat will cache PollerEvent objects to reduce garbage collection. |
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| 372 | The integer value specifies how many objects to keep in the cache at most. |
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| 373 | The default is <code>500</code>. |
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| 374 | Other values are <code>-1</code>. unlimited cache, and <code>0</code>, no cache.</p> |
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| 375 | </td></tr><tr><td valign="center" align="left"><code>socket.tcpNoDelay</code></td><td valign="center" align="left"> |
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| 376 | <p>(bool)same as the standard setting <code>tcpNoDelay</code>. Default value is <code>false</code></p> |
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| 377 | </td></tr><tr><td valign="center" align="left"><code>socket.soKeepAlive</code></td><td valign="center" align="left"> |
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| 378 | <p>(bool)Boolean value for the socket's keep alive setting (SO_KEEPALIVE). Default is <code>false</code>. </p> |
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| 379 | </td></tr><tr><td valign="center" align="left"><code>socket.ooBInline</code></td><td valign="center" align="left"> |
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| 380 | <p>(bool)Boolean value for the socket OOBINLINE setting. Default value is <code>true</code></p> |
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| 381 | </td></tr><tr><td valign="center" align="left"><code>socket.soReuseAddress</code></td><td valign="center" align="left"> |
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| 382 | <p>(bool)Boolean value for the sockets reuse address option (SO_REUSEADDR). Default value is <code>true</code></p> |
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| 383 | </td></tr><tr><td valign="center" align="left"><code>socket.soLingerOn</code></td><td valign="center" align="left"> |
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| 384 | <p>(bool)Boolean value for the sockets so linger option (SO_LINGER). Default value is <code>true</code>. |
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| 385 | This option is paired with the <code>soLingerTime</code> value.</p> |
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| 386 | </td></tr><tr><td valign="center" align="left"><code>socket.soLingerTime</code></td><td valign="center" align="left"> |
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| 387 | <p>(bool)Value in seconds for the sockets so linger option (SO_LINGER). Default value is <code>25</code> seconds. |
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| 388 | This option is paired with the soLinger value.</p> |
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| 389 | </td></tr><tr><td valign="center" align="left"><code>socket.soTimeout</code></td><td valign="center" align="left"> |
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| 390 | <p>(int)Value in milliseconds for the sockets read timeout (SO_TIMEOUT). Default value is <code>5000</code> milliseconds.</p> |
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| 391 | </td></tr><tr><td valign="center" align="left"><code>socket.soTrafficClass</code></td><td valign="center" align="left"> |
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| 392 | <p>(byte)Value between <code>0</code> and <code>255</code> for the traffic class on the socket, <code>0x04 | 0x08 | 0x010</code></p> |
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| 393 | </td></tr><tr><td valign="center" align="left"><code>socket.performanceConnectionTime</code></td><td valign="center" align="left"> |
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| 394 | <p>(int)The first value for the performance settings. Default is <code>1</code>, see <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/net/Socket.html#setPerformancePreferences(int,%20int,%20int)">Socket Performance Options</a></p> |
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| 395 | </td></tr><tr><td valign="center" align="left"><code>socket.performanceLatency</code></td><td valign="center" align="left"> |
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| 396 | <p>(int)The second value for the performance settings. Default is <code>0</code>, see <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/net/Socket.html#setPerformancePreferences(int,%20int,%20int)">Socket Performance Options</a></p> |
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| 397 | </td></tr><tr><td valign="center" align="left"><code>socket.performanceBandwidth</code></td><td valign="center" align="left"> |
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| 398 | <p>(int)The third value for the performance settings. Default is <code>1</code>, see <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/net/Socket.html#setPerformancePreferences(int,%20int,%20int)">Socket Performance Options</a></p> |
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| 399 | </td></tr><tr><td valign="center" align="left"><code>selectorPool.maxSelectors</code></td><td valign="center" align="left"> |
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| 400 | <p>(int)The max selectors to be used in the pool, to reduce selector contention. |
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| 401 | Use this option when the command line <code>org.apache.tomcat.util.net.NioSelectorShared</code> value is set to false. |
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| 402 | Default value is <code>200</code>.</p> |
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| 403 | </td></tr><tr><td valign="center" align="left"><code>selectorPool.maxSpareSelectors</code></td><td valign="center" align="left"> |
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| 404 | <p>(int)The max spare selectors to be used in the pool, to reduce selector contention. |
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| 405 | When a selector is returned to the pool, the system can decide to keep it or let it be GC:ed. |
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| 406 | Use this option when the command line <code>org.apache.tomcat.util.net.NioSelectorShared</code> value is set to false. |
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| 407 | Default value is <code>-1</code> (unlimited)</p> |
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| 408 | </td></tr><tr><td valign="center" align="left"><code>command-line-options</code></td><td valign="center" align="left"> |
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| 409 | <p>The following command line options are available for the NIO connector:<br> |
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| 410 | <code>-Dorg.apache.tomcat.util.net.NioSelectorShared=true|false</code> - default is <code>true</code>. |
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| 411 | Set this value to false if you wish to use a selector for each thread. |
|---|
| 412 | the property. If you do set it to false, you can control the size of the pool of selectors by using the |
|---|
| 413 | selectorPool.maxSelectors attribute</p> |
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| 414 | </td></tr><tr><td valign="center" align="left"><code>oomParachute</code></td><td valign="center" align="left"> |
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| 415 | <p>(int)The NIO connector implements an OutOfMemoryError strategy called parachute. |
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| 416 | It holds a chunk of data as a byte array. In case of an OOM, |
|---|
| 417 | this chunk of data is released and the error is reported. This will give the VM enough room |
|---|
| 418 | to clean up. The <code>oomParachute</code> represent the size in bytes of the parachute(the byte array). |
|---|
| 419 | The default value is <code>1024*1024</code>(1MB). |
|---|
| 420 | Please note, this only works for OOM errors regarding the Java Heap space, and there is absolutely no |
|---|
| 421 | guarantee that you will be able to recover at all. |
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| 422 | If you have an OOM outside of the Java Heap, then this parachute trick will not help. |
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| 423 | </p> |
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| 424 | </td></tr></table> |
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| 425 | </blockquote></td></tr></table> |
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| 426 | |
|---|
| 427 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Nested Components"><strong>Nested Components</strong></a></font></td></tr><tr><td><blockquote> |
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| 428 | |
|---|
| 429 | <p>None at this time.</p> |
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| 430 | |
|---|
| 431 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Special Features"><strong>Special Features</strong></a></font></td></tr><tr><td><blockquote> |
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| 432 | |
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| 433 | |
|---|
| 434 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="HTTP/1.1 and HTTP/1.0 Support"><strong>HTTP/1.1 and HTTP/1.0 Support</strong></a></font></td></tr><tr><td><blockquote> |
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| 435 | |
|---|
| 436 | <p>This <strong>Connector</strong> supports all of the required features |
|---|
| 437 | of the HTTP/1.1 protocol, as described in RFC 2616, including persistent |
|---|
| 438 | connections, pipelining, expectations and chunked encoding. If the client |
|---|
| 439 | (typically a browser) supports only HTTP/1.0, the |
|---|
| 440 | <strong>Connector</strong> will gracefully fall back to supporting this |
|---|
| 441 | protocol as well. No special configuration is required to enable this |
|---|
| 442 | support. The <strong>Connector</strong> also supports HTTP/1.0 |
|---|
| 443 | keep-alive.</p> |
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| 444 | |
|---|
| 445 | <p>RFC 2616 requires that HTTP servers always begin their responses with |
|---|
| 446 | the highest HTTP version that they claim to support. Therefore, this |
|---|
| 447 | <strong>Connector</strong> will always return <code>HTTP/1.1</code> at |
|---|
| 448 | the beginning of its responses.</p> |
|---|
| 449 | |
|---|
| 450 | </blockquote></td></tr></table> |
|---|
| 451 | |
|---|
| 452 | |
|---|
| 453 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Proxy Support"><strong>Proxy Support</strong></a></font></td></tr><tr><td><blockquote> |
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| 454 | |
|---|
| 455 | <p>The <code>proxyName</code> and <code>proxyPort</code> attributes can |
|---|
| 456 | be used when Tomcat is run behind a proxy server. These attributes |
|---|
| 457 | modify the values returned to web applications that call the |
|---|
| 458 | <code>request.getServerName()</code> and <code>request.getServerPort()</code> |
|---|
| 459 | methods, which are often used to construct absolute URLs for redirects. |
|---|
| 460 | Without configuring these attributes, the values returned would reflect |
|---|
| 461 | the server name and port on which the connection from the proxy server |
|---|
| 462 | was received, rather than the server name and port to whom the client |
|---|
| 463 | directed the original request.</p> |
|---|
| 464 | |
|---|
| 465 | <p>For more information, see the |
|---|
| 466 | <a href="../../proxy-howto.html">Proxy Support HOW-TO</a>.</p> |
|---|
| 467 | |
|---|
| 468 | </blockquote></td></tr></table> |
|---|
| 469 | |
|---|
| 470 | |
|---|
| 471 | |
|---|
| 472 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="SSL Support"><strong>SSL Support</strong></a></font></td></tr><tr><td><blockquote> |
|---|
| 473 | |
|---|
| 474 | <p>You can enable SSL support for a particular instance of this |
|---|
| 475 | <strong>Connector</strong> by setting the <code>secure</code> attribute to |
|---|
| 476 | <code>true</code>. In addition, you may need to configure the following |
|---|
| 477 | attributes:</p> |
|---|
| 478 | |
|---|
| 479 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><code>algorithm</code></td><td valign="center" align="left"> |
|---|
| 480 | <p>The certificate encoding algorithm to be used. This defaults to the Sun |
|---|
| 481 | implementation (<code>SunX509</code>). For IBM JVMs you should use the |
|---|
| 482 | value <code>IbmX509</code>. For other vendors, consult the JVM |
|---|
| 483 | documentation for the correct value.</p> |
|---|
| 484 | </td></tr><tr><td valign="center" align="left"><code>clientAuth</code></td><td valign="center" align="left"> |
|---|
| 485 | <p>Set to <code>true</code> if you want the SSL stack to require a |
|---|
| 486 | valid certificate chain from the client before accepting a connection. |
|---|
| 487 | Set to <code>want</code> if you want the SSL stack to request a client |
|---|
| 488 | Certificate, but not fail if one isn't presented. A <code>false</code> |
|---|
| 489 | value (which is the default) will not require a certificate chain |
|---|
| 490 | unless the client requests a resource protected by a security |
|---|
| 491 | constraint that uses <code>CLIENT-CERT</code> authentication. See the |
|---|
| 492 | <a href="../../ssl-howto.html">SSL HowTo</a> for an example.</p> |
|---|
| 493 | </td></tr><tr><td valign="center" align="left"><code>keystoreFile</code></td><td valign="center" align="left"> |
|---|
| 494 | <p>The pathname of the keystore file where you have stored the |
|---|
| 495 | server certificate to be loaded. By default, the pathname is |
|---|
| 496 | the file "<code>.keystore</code>" in the operating system home |
|---|
| 497 | directory of the user that is running Tomcat. If your |
|---|
| 498 | <code>keystoreType</code> doesn't need a file use <code>""</code> |
|---|
| 499 | (empty string) for this parameter.</p> |
|---|
| 500 | </td></tr><tr><td valign="center" align="left"><code>keystorePass</code></td><td valign="center" align="left"> |
|---|
| 501 | <p>The password used to access the server certificate from the |
|---|
| 502 | specified keystore file. The default value is "<code>changeit</code>". |
|---|
| 503 | </p> |
|---|
| 504 | </td></tr><tr><td valign="center" align="left"><code>keystoreType</code></td><td valign="center" align="left"> |
|---|
| 505 | <p>The type of keystore file to be used for the server certificate. |
|---|
| 506 | If not specified, the default value is "<code>JKS</code>".</p> |
|---|
| 507 | </td></tr><tr><td valign="center" align="left"><code>keystoreProvider</code></td><td valign="center" align="left"> |
|---|
| 508 | <p>The name of the keystore provider to be used for the server |
|---|
| 509 | certificate. If not specified, the list of registered providers is |
|---|
| 510 | traversed in preference order and the first provider that supports the |
|---|
| 511 | <code>keystoreType</code> is used. |
|---|
| 512 | </p> |
|---|
| 513 | </td></tr><tr><td valign="center" align="left"><code>sslProtocol</code></td><td valign="center" align="left"> |
|---|
| 514 | <p>The version of the SSL protocol to use. If not specified, |
|---|
| 515 | the default is "<code>TLS</code>".</p> |
|---|
| 516 | </td></tr><tr><td valign="center" align="left"><code>ciphers</code></td><td valign="center" align="left"> |
|---|
| 517 | <p>A comma seperated list of the encryption ciphers that may be used. |
|---|
| 518 | If not specified, then any available cipher may be used.</p> |
|---|
| 519 | </td></tr><tr><td valign="center" align="left"><code>keyAlias</code></td><td valign="center" align="left"> |
|---|
| 520 | <p>The alias used to for the server certificate in the keystore. If not |
|---|
| 521 | specified the first key read in the keystore will be used.</p> |
|---|
| 522 | </td></tr><tr><td valign="center" align="left"><code>truststoreFile</code></td><td valign="center" align="left"> |
|---|
| 523 | <p>The TrustStore file to use to validate client certificates.</p> |
|---|
| 524 | </td></tr><tr><td valign="center" align="left"><code>truststorePass</code></td><td valign="center" align="left"> |
|---|
| 525 | <p>The password to access the TrustStore. This defaults to the value |
|---|
| 526 | of <code>keystorePass</code>.</p> |
|---|
| 527 | </td></tr><tr><td valign="center" align="left"><code>truststoreType</code></td><td valign="center" align="left"> |
|---|
| 528 | <p>Add this element if your are using a different format for the |
|---|
| 529 | TrustStore then you are using for the KeyStore.</p> |
|---|
| 530 | </td></tr><tr><td valign="center" align="left"><code>truststoreProvider</code></td><td valign="center" align="left"> |
|---|
| 531 | <p>The name of the truststore provider to be used for the server |
|---|
| 532 | certificate. If not specified, the list of registered providers is |
|---|
| 533 | traversed in preference order and the first provider that supports the |
|---|
| 534 | <code>truststoreType</code> is used. |
|---|
| 535 | </p> |
|---|
| 536 | </td></tr></table> |
|---|
| 537 | |
|---|
| 538 | <p>For more information, see the |
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| 539 | <a href="../../ssl-howto.html">SSL Configuration HOW-TO</a>.</p> |
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| 540 | |
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| 541 | </blockquote></td></tr></table> |
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| 542 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Connector Comparison"><strong>Connector Comparison</strong></a></font></td></tr><tr><td><blockquote> |
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| 543 | |
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| 544 | <p>Below is a small chart that shows how the connectors differentiate.</p> |
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| 545 | <div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td></tr><tr><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre> |
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| 546 | Java Blocking Connector Java Nio Blocking Connector APR Connector |
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| 547 | Classname Http11Protocol Http11NioProtocol Http11AprProtocol |
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| 548 | Tomcat Version 3.x 4.x 5.x 6.x 6.x 5.5.x 6.x |
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| 549 | Support Polling NO YES YES |
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| 550 | Polling Size N/A Unlimited - Restricted by mem Unlimited |
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| 551 | Read HTTP Request Blocking Blocking Blocking |
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| 552 | Read HTTP Body Blocking Blocking Blocking |
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| 553 | Write HTTP Response Blocking Blocking Blocking |
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| 554 | SSL Support Java SSL Java SSL OpenSSL |
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| 555 | SSL Handshake Blocking Non blocking Blocking |
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| 556 | Max Connections maxThreads See polling size See polling size |
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| 557 | |
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| 558 | |
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| 559 | </pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td></tr><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td></tr></table></div> |
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| 560 | |
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| 561 | </blockquote></td></tr></table> |
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| 562 | </blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr size="1" noshade></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font size="-1" color="#525D76"><em> |
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| 563 | Copyright © 1999-2008, Apache Software Foundation |
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| 564 | </em></font></div></td></tr></table></body></html> |
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