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<title>core - Apache HTTP Server</title>
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
<p class="apache">Apache HTTP Server Version 2.2</p>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.2</a> > <a href="./">Modules</a></div>
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<div id="preamble"><h1>Apache Core Features</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../de/mod/core.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> |
<a href="../en/mod/core.html" title="English"> en </a> |
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Core Apache HTTP Server features that are always
available</td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Core</td></tr></table>
</div>
<div id="quickview"><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#acceptfilter">AcceptFilter</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#acceptpathinfo">AcceptPathInfo</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#accessfilename">AccessFileName</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#adddefaultcharset">AddDefaultCharset</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#addoutputfilterbytype">AddOutputFilterByType</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#allowencodedslashes">AllowEncodedSlashes</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#allowoverride">AllowOverride</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authname">AuthName</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authtype">AuthType</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#cgimapextension">CGIMapExtension</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#contentdigest">ContentDigest</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#defaulttype">DefaultType</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#directory"><Directory></a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#directorymatch"><DirectoryMatch></a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#documentroot">DocumentRoot</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#enablemmap">EnableMMAP</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#enablesendfile">EnableSendfile</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#errordocument">ErrorDocument</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#errorlog">ErrorLog</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#fileetag">FileETag</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#files"><Files></a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#filesmatch"><FilesMatch></a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#forcetype">ForceType</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#hostnamelookups">HostnameLookups</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#ifdefine"><IfDefine></a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#ifmodule"><IfModule></a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#include">Include</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#keepalive">KeepAlive</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#keepalivetimeout">KeepAliveTimeout</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#limit"><Limit></a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#limitexcept"><LimitExcept></a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#limitinternalrecursion">LimitInternalRecursion</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#limitrequestbody">LimitRequestBody</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#limitrequestfields">LimitRequestFields</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#limitrequestfieldsize">LimitRequestFieldSize</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#limitrequestline">LimitRequestLine</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#limitxmlrequestbody">LimitXMLRequestBody</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#location"><Location></a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#locationmatch"><LocationMatch></a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#loglevel">LogLevel</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#maxkeepaliverequests">MaxKeepAliveRequests</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#namevirtualhost">NameVirtualHost</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#options">Options</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#require">Require</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#rlimitcpu">RLimitCPU</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#rlimitmem">RLimitMEM</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#rlimitnproc">RLimitNPROC</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#satisfy">Satisfy</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#scriptinterpretersource">ScriptInterpreterSource</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#serveradmin">ServerAdmin</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#serveralias">ServerAlias</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#servername">ServerName</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#serverpath">ServerPath</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#serverroot">ServerRoot</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#serversignature">ServerSignature</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#servertokens">ServerTokens</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#sethandler">SetHandler</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#setinputfilter">SetInputFilter</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#setoutputfilter">SetOutputFilter</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#timeout">TimeOut</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#traceenable">TraceEnable</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#usecanonicalname">UseCanonicalName</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#usecanonicalphysicalport">UseCanonicalPhysicalPort</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#virtualhost"><VirtualHost></a></li>
</ul>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="AcceptFilter" id="AcceptFilter">AcceptFilter</a> <a name="acceptfilter" id="acceptfilter">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Configures optimizations for a Protocol's Listener Sockets</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AcceptFilter <var>protocol</var> <var>accept_filter</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Core</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>core</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.1.5 and later</td></tr>
</table>
<p>This directive enables operating system specific optimizations for a
listening socket by the Protocol type. The basic premise is for the
kernel to not send a socket to the server process until either data
is received or an entire HTTP Request is buffered. Only
<a href="http://www.freebsd.org/cgi/man.cgi?query=accept_filter&sektion=9">
FreeBSD's Accept Filters</a> and Linux's more primitive
<code>TCP_DEFER_ACCEPT</code> are currently supported.</p>
<p>The default values on FreeBSD are:</p>
<div class="example"><p><code>
AcceptFilter http httpready <br />
AcceptFilter https dataready
</code></p></div>
<p>The <code>httpready</code> accept filter buffers entire HTTP requests at
the kernel level. Once an entire request is recieved, the kernel then
sends it to the server. See the
<a href="http://www.freebsd.org/cgi/man.cgi?query=accf_http&sektion=9">
accf_http(9)</a> man page for more details. Since HTTPS requests are
encrypted only the <a href="http://www.freebsd.org/cgi/man.cgi?query=accf_data&sektion=9">
accf_data(9)</a> filter is used.</p>
<p>The default values on Linux are:</p>
<div class="example"><p><code>
AcceptFilter http data <br />
AcceptFilter https data
</code></p></div>
<p>Linux's <code>TCP_DEFER_ACCEPT</code> does not support buffering http
requests. Any value besides <code>none</code> will enable
<code>TCP_DEFER_ACCEPT</code> on that listener. For more details
see the Linux
<a href="http://homepages.cwi.nl/~aeb/linux/man2html/man7/tcp.7.html">
tcp(7)</a> man page.</p>
<p>Using <code>none</code> for an argument will disable any accept filters
for that protocol. This is useful for protocols that require a server
send data first, such as <code>nntp</code>:</p>
<div class="example"><p><code>AcceptFilter nttp none</code></p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="AcceptPathInfo" id="AcceptPathInfo">AcceptPathInfo</a> <a name="acceptpathinfo" id="acceptpathinfo">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Resources accept trailing pathname information</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AcceptPathInfo On|Off|Default</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AcceptPathInfo Default</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Core</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>core</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.0.30 and later</td></tr>
</table>
<p>This directive controls whether requests that contain trailing
pathname information that follows an actual filename (or
non-existent file in an existing directory) will be accepted or
rejected. The trailing pathname information can be made
available to scripts in the <code>PATH_INFO</code> environment
variable.</p>
<p>For example, assume the location <code>/test/</code> points to
a directory that contains only the single file
<code>here.html</code>. Then requests for
<code>/test/here.html/more</code> and
<code>/test/nothere.html/more</code> both collect
<code>/more</code> as <code>PATH_INFO</code>.</p>
<p>The three possible arguments for the
<code class="directive">AcceptPathInfo</code> directive are:</p>
<dl>
<dt><code>Off</code></dt><dd>A request will only be accepted if it
maps to a literal path that exists. Therefore a request with
trailing pathname information after the true filename such as
<code>/test/here.html/more</code> in the above example will return
a 404 NOT FOUND error.</dd>
<dt><code>On</code></dt><dd>A request will be accepted if a
leading path component maps to a file that exists. The above
example <code>/test/here.html/more</code> will be accepted if
<code>/test/here.html</code> maps to a valid file.</dd>
<dt><code>Default</code></dt><dd>The treatment of requests with
trailing pathname information is determined by the <a href="../handler.html">handler</a> responsible for the request.
The core handler for normal files defaults to rejecting
<code>PATH_INFO</code> requests. Handlers that serve scripts, such as <a href="mod_cgi.html">cgi-script</a> and <a href="mod_isapi.html">isapi-handler</a>, generally accept
<code>PATH_INFO</code> by default.</dd>
</dl>
<p>The primary purpose of the <code>AcceptPathInfo</code>
directive is to allow you to override the handler's choice of
accepting or rejecting <code>PATH_INFO</code>. This override is required,
for example, when you use a <a href="../filter.html">filter</a>, such
as <a href="mod_include.html">INCLUDES</a>, to generate content
based on <code>PATH_INFO</code>. The core handler would usually reject
the request, so you can use the following configuration to enable
such a script:</p>
<div class="example"><p><code>
<Files "mypaths.shtml"><br />
<span class="indent">
Options +Includes<br />
SetOutputFilter INCLUDES<br />
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