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-<title>mod_h2 - Apache HTTP Server Version 2.4</title>
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-<p class="apache">Apache HTTP Server Version 2.4</p>
-<img alt="" src="../images/feather.gif" /></div>
-<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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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 2.4</a> > <a href="./">Modules</a></div>
-<div id="page-content">
-<div id="preamble"><h1>Apache Module mod_h2</h1>
-<div class="toplang">
-<p><span>Available Languages: </span><a href="../en/mod/mod_h2.html" title="English"> en </a></p>
-</div>
-<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Support for the HTTP/2 transport layer</td></tr>
-<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
-<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>h2_module</td></tr>
-<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_h2.c</td></tr></table>
-<h3>Summary</h3>
-
- <p>This module provides HTTP/2 (RFC 7540) support for the Apache
- HTTP Server.</p>
-
- <p>This module relies on <a href="http://nghttp2.org/">libnghttp2</a>
- to provide the core http/2 engine.</p>
-
- </div>
-<div id="quickview"><h3 class="directives">Directives</h3>
-<ul id="toc">
-<li><img alt="" src="../images/down.gif" /> <a href="#h2direct">H2Direct</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#h2maxsessionstreams">H2MaxSessionStreams</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#h2maxworkeridleseconds">H2MaxWorkerIdleSeconds</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#h2maxworkers">H2MaxWorkers</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#h2minworkers">H2MinWorkers</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#h2serializeheaders">H2SerializeHeaders</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#h2sessionextrafiles">H2SessionExtraFiles</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#h2streammaxmemsize">H2StreamMaxMemSize</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#h2windowsize">H2WindowSize</a></li>
-</ul>
-<ul class="seealso"><li><a href="#comments_section">Comments</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="H2Direct" id="H2Direct">H2Direct</a> <a name="h2direct" id="h2direct">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>H2 Direct Protocol Switch</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2Direct on|off</code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2Direct on (for non TLS)</code></td></tr>
-<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_h2</td></tr>
-</table>
- <p>
- This directive toggles the usage of the HTTP/2 Direct Mode. This
- should be used inside a
- <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code>
- section to enable direct HTTP/2 communication for that virtual host.
- Direct communication means that if the first bytes received by the
- server on a connection match the HTTP/2 preamble, the HTTP/2
- protocol is switched to immediately without further negotiation.
- This mode falls outside the RFC 7540 but has become widely implemented
- as it is very convenient for development and testing.
- By default the direct HTTP/2 mode is enabled.
- </p>
- <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">H2Direct on</pre>
-</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="H2MaxSessionStreams" id="H2MaxSessionStreams">H2MaxSessionStreams</a> <a name="h2maxsessionstreams" id="h2maxsessionstreams">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum number of active streams per HTTP/2 session.</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2MaxSessionStreams <em>n</em></code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2MaxSessionStreams 100</code></td></tr>
-<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_h2</td></tr>
-</table>
- <p>
- This directive sets the maximum number of active streams per HTTP/2 session (e.g. connection)
- that the server allows. A stream is active if it is not <code>idle</code> or
- <code>closed</code> according to RFC 7540.
- </p>
- <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">H2MaxSessionStreams 20</pre>
-</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="H2MaxWorkerIdleSeconds" id="H2MaxWorkerIdleSeconds">H2MaxWorkerIdleSeconds</a> <a name="h2maxworkeridleseconds" id="h2maxworkeridleseconds">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum number of seconds h2 workers remain idle until shut down.</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2MaxWorkerIdleSeconds <em>n</em></code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2MaxWorkerIdleSeconds 600</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>Extension</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_h2</td></tr>
-</table>
- <p>
- This directive sets the maximum number of seconds a h2 worker may
- idle until it shuts itself down. This only happens while the number of
- h2 workers exceeds <code>H2MinWorkers</code>.
- </p>
- <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">H2MaxWorkerIdleSeconds 20</pre>
-</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="H2MaxWorkers" id="H2MaxWorkers">H2MaxWorkers</a> <a name="h2maxworkers" id="h2maxworkers">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum number of worker threads to use per child process.</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2MaxWorkers <em>n</em></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>Extension</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_h2</td></tr>
-</table>
- <p>
- This directive sets the maximum number of worker threads to spawn
- per child process for HTTP/2 processing. If this directive is not used,
- <code>mod_h2</code> will chose a value suitable for the <code>mpm</code>
- module loaded.
- </p>
- <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">H2MaxWorkers 20</pre>
-</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="H2MinWorkers" id="H2MinWorkers">H2MinWorkers</a> <a name="h2minworkers" id="h2minworkers">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Minimal number of worker threads to use per child process.</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2MinWorkers <em>n</em></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>Extension</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_h2</td></tr>
-</table>
- <p>
- This directive sets the minimum number of worker threads to spawn
- per child process for HTTP/2 processing. If this directive is not used,
- <code>mod_h2</code> will chose a value suitable for the <code>mpm</code>
- module loaded.
- </p>
- <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">H2MinWorkers 10</pre>
-</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="H2SerializeHeaders" id="H2SerializeHeaders">H2SerializeHeaders</a> <a name="h2serializeheaders" id="h2serializeheaders">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Serialize Request/Resoonse Processing Switch</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2SerializeHeaders on|off</code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2SerializeHeaders off</code></td></tr>
-<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_h2</td></tr>
-</table>
- <p>
- This directive toggles if HTTP/2 requests shall be serialized in
- HTTP/1.1 format for processing by <code>httpd</code> core or if
- received binary data shall be passed into the <code>request_rec</code>s
- directly.
- </p>
- <p>
- Serialization will lower performance, but gives more backward
- compatibility in case custom filters/hooks need it.
- </p>
- <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">H2SerializeHeaders on</pre>
-</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="H2SessionExtraFiles" id="H2SessionExtraFiles">H2SessionExtraFiles</a> <a name="h2sessionextrafiles" id="h2sessionextrafiles">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Number of Extra File Handles</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2SessionExtraFiles <em>n</em></code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2SessionExtraFiles 5</code></td></tr>
-<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_h2</td></tr>
-</table>
- <p>
- This directive sets maximum number of <em>extra</em> file handles
- a HTTP/2 session is allowed to use. A file handle is counted as
- <em>extra</em> when it is transfered from a h2 worker thread to
- the main HTTP/2 connection handling. This commonly happens when
- serving static files.
- </p><p>
- Depending on the processing model configured on the server, the
- number of connections times number of active streams may exceed
- the number of file handles for the process. On the other hand,
- converting every file into memory bytes early results in too
- many buffer writes. This option helps to mitigate that.
- </p><p>
- The number of file handles used by a server process is then in
- the order of:
- </p>
- <pre>(h2_connections * extra_files) + (h2_max_worker)</pre>
- <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">H2SessionExtraFiles 10</pre>
-</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="H2StreamMaxMemSize" id="H2StreamMaxMemSize">H2StreamMaxMemSize</a> <a name="h2streammaxmemsize" id="h2streammaxmemsize">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum amount of output data buffered per stream.</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2StreamMaxMemSize <em>bytes</em></code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2StreamMaxMemSize 65536</code></td></tr>
-<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_h2</td></tr>
-</table>
- <p>
- This directive sets the maximum number of outgoing data bytes buffered in memory
- for an active streams. This memory is not allocated per stream as such. Allocations
- are counted against this limit when they are about to be done. Stream processing
- freezes when the limit has been reached and will only continue when buffered data
- has been sent out to the client.
- </p>
- <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">H2StreamMaxMemSize 128000</pre>
-</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="H2WindowSize" id="H2WindowSize">H2WindowSize</a> <a name="h2windowsize" id="h2windowsize">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Size of Stream Window for upstream data.</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2WindowSize <em>bytes</em></code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2WindowSize 65536</code></td></tr>
-<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_h2</td></tr>
-</table>
- <p>
- This directive sets the size of the window that is used for flow control
- from client to server and limits the amount of data the server has to buffer.
- The client will stop sending on a stream once the limit has been reached until
- the server announces more available space (as it has processed some of the data).
- </p><p>
- This limit affects only request bodies, not its meta data such as headers. Also,
- it has no effect on response bodies as the window size for those are managed
- by the clients.
- </p>
- <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">H2WindowSize 128000</pre>
-</div>
-
-</div>
-</div>
-<div class="bottomlang">
-<p><span>Available Languages: </span><a href="../en/mod/mod_h2.html" title="English"> en </a></p>
-</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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-<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div><script type="text/javascript"><!--//--><![CDATA[//><!--
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-</body></html>
\ No newline at end of file
+++ /dev/null
-<?xml version="1.0"?>
-<!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">
-<?xml-stylesheet type="text/xsl" href="../style/manual.en.xsl"?>
-<!-- $LastChangedRevision$ -->
-
-<!--
- Licensed to the Apache Software Foundation (ASF) under one or more
- contributor license agreements. See the NOTICE file distributed with
- this work for additional information regarding copyright ownership.
- The ASF licenses this file to You under the Apache License, Version 2.0
- (the "License"); you may not use this file except in compliance with
- the License. You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
- -->
-
-<modulesynopsis metafile="mod_h2.xml.meta">
-
- <name>mod_h2</name>
- <description>Support for the HTTP/2 transport layer</description>
- <status>Extension</status>
- <sourcefile>mod_h2.c</sourcefile>
- <identifier>h2_module</identifier>
-
- <summary>
- <p>This module provides HTTP/2 (RFC 7540) support for the Apache
- HTTP Server.</p>
-
- <p>This module relies on <a href="http://nghttp2.org/">libnghttp2</a>
- to provide the core http/2 engine.</p>
-
- </summary>
-
- <directivesynopsis>
- <name>H2Direct</name>
- <description>H2 Direct Protocol Switch</description>
- <syntax>H2Direct on|off</syntax>
- <default>H2Direct on (for non TLS)</default>
- <contextlist>
- <context>server config</context>
- <context>virtual host</context>
- </contextlist>
-
- <usage>
- <p>
- This directive toggles the usage of the HTTP/2 Direct Mode. This
- should be used inside a
- <directive module="core" type="section">VirtualHost</directive>
- section to enable direct HTTP/2 communication for that virtual host.
- Direct communication means that if the first bytes received by the
- server on a connection match the HTTP/2 preamble, the HTTP/2
- protocol is switched to immediately without further negotiation.
- This mode falls outside the RFC 7540 but has become widely implemented
- as it is very convenient for development and testing.
- By default the direct HTTP/2 mode is enabled.
- </p>
- <example><title>Example</title>
- <highlight language="config">
- H2Direct on
- </highlight>
- </example>
- </usage>
- </directivesynopsis>
-
- <directivesynopsis>
- <name>H2MaxSessionStreams</name>
- <description>Maximum number of active streams per HTTP/2 session.</description>
- <syntax>H2MaxSessionStreams <em>n</em></syntax>
- <default>H2MaxSessionStreams 100</default>
- <contextlist>
- <context>server config</context>
- <context>virtual host</context>
- </contextlist>
- <usage>
- <p>
- This directive sets the maximum number of active streams per HTTP/2 session (e.g. connection)
- that the server allows. A stream is active if it is not <code>idle</code> or
- <code>closed</code> according to RFC 7540.
- </p>
- <example><title>Example</title>
- <highlight language="config">
- H2MaxSessionStreams 20
- </highlight>
- </example>
- </usage>
- </directivesynopsis>
-
- <directivesynopsis>
- <name>H2StreamMaxMemSize</name>
- <description>Maximum amount of output data buffered per stream.</description>
- <syntax>H2StreamMaxMemSize <em>bytes</em></syntax>
- <default>H2StreamMaxMemSize 65536</default>
- <contextlist>
- <context>server config</context>
- <context>virtual host</context>
- </contextlist>
- <usage>
- <p>
- This directive sets the maximum number of outgoing data bytes buffered in memory
- for an active streams. This memory is not allocated per stream as such. Allocations
- are counted against this limit when they are about to be done. Stream processing
- freezes when the limit has been reached and will only continue when buffered data
- has been sent out to the client.
- </p>
- <example><title>Example</title>
- <highlight language="config">
- H2StreamMaxMemSize 128000
- </highlight>
- </example>
- </usage>
- </directivesynopsis>
-
- <directivesynopsis>
- <name>H2WindowSize</name>
- <description>Size of Stream Window for upstream data.</description>
- <syntax>H2WindowSize <em>bytes</em></syntax>
- <default>H2WindowSize 65536</default>
- <contextlist>
- <context>server config</context>
- <context>virtual host</context>
- </contextlist>
- <usage>
- <p>
- This directive sets the size of the window that is used for flow control
- from client to server and limits the amount of data the server has to buffer.
- The client will stop sending on a stream once the limit has been reached until
- the server announces more available space (as it has processed some of the data).
- </p><p>
- This limit affects only request bodies, not its meta data such as headers. Also,
- it has no effect on response bodies as the window size for those are managed
- by the clients.
- </p>
- <example><title>Example</title>
- <highlight language="config">
- H2WindowSize 128000
- </highlight>
- </example>
- </usage>
- </directivesynopsis>
-
- <directivesynopsis>
- <name>H2MinWorkers</name>
- <description>Minimal number of worker threads to use per child process.</description>
- <syntax>H2MinWorkers <em>n</em></syntax>
- <contextlist>
- <context>server config</context>
- </contextlist>
- <usage>
- <p>
- This directive sets the minimum number of worker threads to spawn
- per child process for HTTP/2 processing. If this directive is not used,
- <code>mod_h2</code> will chose a value suitable for the <code>mpm</code>
- module loaded.
- </p>
- <example><title>Example</title>
- <highlight language="config">
- H2MinWorkers 10
- </highlight>
- </example>
- </usage>
- </directivesynopsis>
-
- <directivesynopsis>
- <name>H2MaxWorkers</name>
- <description>Maximum number of worker threads to use per child process.</description>
- <syntax>H2MaxWorkers <em>n</em></syntax>
- <contextlist>
- <context>server config</context>
- </contextlist>
- <usage>
- <p>
- This directive sets the maximum number of worker threads to spawn
- per child process for HTTP/2 processing. If this directive is not used,
- <code>mod_h2</code> will chose a value suitable for the <code>mpm</code>
- module loaded.
- </p>
- <example><title>Example</title>
- <highlight language="config">
- H2MaxWorkers 20
- </highlight>
- </example>
- </usage>
- </directivesynopsis>
-
- <directivesynopsis>
- <name>H2MaxWorkerIdleSeconds</name>
- <description>Maximum number of seconds h2 workers remain idle until shut down.</description>
- <syntax>H2MaxWorkerIdleSeconds <em>n</em></syntax>
- <default>H2MaxWorkerIdleSeconds 600</default>
- <contextlist>
- <context>server config</context>
- </contextlist>
- <usage>
- <p>
- This directive sets the maximum number of seconds a h2 worker may
- idle until it shuts itself down. This only happens while the number of
- h2 workers exceeds <code>H2MinWorkers</code>.
- </p>
- <example><title>Example</title>
- <highlight language="config">
- H2MaxWorkerIdleSeconds 20
- </highlight>
- </example>
- </usage>
- </directivesynopsis>
-
- <directivesynopsis>
- <name>H2SessionExtraFiles</name>
- <description>Number of Extra File Handles</description>
- <syntax>H2SessionExtraFiles <em>n</em></syntax>
- <default>H2SessionExtraFiles 5</default>
- <contextlist>
- <context>server config</context>
- <context>virtual host</context>
- </contextlist>
- <usage>
- <p>
- This directive sets maximum number of <em>extra</em> file handles
- a HTTP/2 session is allowed to use. A file handle is counted as
- <em>extra</em> when it is transfered from a h2 worker thread to
- the main HTTP/2 connection handling. This commonly happens when
- serving static files.
- </p><p>
- Depending on the processing model configured on the server, the
- number of connections times number of active streams may exceed
- the number of file handles for the process. On the other hand,
- converting every file into memory bytes early results in too
- many buffer writes. This option helps to mitigate that.
- </p><p>
- The number of file handles used by a server process is then in
- the order of:
- </p>
- <pre>
- (h2_connections * extra_files) + (h2_max_worker)
- </pre>
- <example><title>Example</title>
- <highlight language="config">
- H2SessionExtraFiles 10
- </highlight>
- </example>
- </usage>
- </directivesynopsis>
-
- <directivesynopsis>
- <name>H2SerializeHeaders</name>
- <description>Serialize Request/Resoonse Processing Switch</description>
- <syntax>H2SerializeHeaders on|off</syntax>
- <default>H2SerializeHeaders off</default>
- <contextlist>
- <context>server config</context>
- <context>virtual host</context>
- </contextlist>
- <usage>
- <p>
- This directive toggles if HTTP/2 requests shall be serialized in
- HTTP/1.1 format for processing by <code>httpd</code> core or if
- received binary data shall be passed into the <code>request_rec</code>s
- directly.
- </p>
- <p>
- Serialization will lower performance, but gives more backward
- compatibility in case custom filters/hooks need it.
- </p>
- <example><title>Example</title>
- <highlight language="config">
- H2SerializeHeaders on
- </highlight>
- </example>
- </usage>
- </directivesynopsis>
-
-</modulesynopsis>
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