diff options
Diffstat (limited to '')
-rw-r--r-- | docs/manual/mod/mod_http2.html | 9 | ||||
-rw-r--r-- | docs/manual/mod/mod_http2.html.en | 912 | ||||
-rw-r--r-- | docs/manual/mod/mod_http2.html.fr.utf8 | 1031 |
3 files changed, 1952 insertions, 0 deletions
diff --git a/docs/manual/mod/mod_http2.html b/docs/manual/mod/mod_http2.html new file mode 100644 index 0000000..4bdaf32 --- /dev/null +++ b/docs/manual/mod/mod_http2.html @@ -0,0 +1,9 @@ +# GENERATED FROM XML -- DO NOT EDIT + +URI: mod_http2.html.en +Content-Language: en +Content-type: text/html; charset=ISO-8859-1 + +URI: mod_http2.html.fr.utf8 +Content-Language: fr +Content-type: text/html; charset=UTF-8 diff --git a/docs/manual/mod/mod_http2.html.en b/docs/manual/mod/mod_http2.html.en new file mode 100644 index 0000000..4dfee32 --- /dev/null +++ b/docs/manual/mod/mod_http2.html.en @@ -0,0 +1,912 @@ +<?xml version="1.0" encoding="ISO-8859-1"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head> +<meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type" /> +<!-- + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + This file is generated from xml source: DO NOT EDIT + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + --> +<title>mod_http2 - Apache HTTP Server Version 2.4</title> +<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> +<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> +<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" /> +<script src="../style/scripts/prettify.min.js" type="text/javascript"> +</script> + +<link href="../images/favicon.ico" rel="shortcut icon" /></head> +<body> +<div id="page-header"> +<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> +<p class="apache">Apache HTTP Server Version 2.4</p> +<img alt="" src="../images/feather.png" /></div> +<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div> +<div id="path"> +<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_http2</h1> +<div class="toplang"> +<p><span>Available Languages: </span><a href="../en/mod/mod_http2.html" title="English"> en </a> | +<a href="../fr/mod/mod_http2.html" hreflang="fr" rel="alternate" title="Français"> fr </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>http2_module</td></tr> +<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_http2.c</td></tr> +<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.4.17 and later</td></tr></table> +<h3>Summary</h3> + + <p>This module provides HTTP/2 (<a href="https://tools.ietf.org/html/rfc7540">RFC 7540</a>) + 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> + + <p>You must enable HTTP/2 via <code class="directive"><a href="../mod/core.html#protocols">Protocols</a></code> + in order to use the functionality described in this document. The + HTTP/2 protocol <a href="https://http2.github.io/faq/#does-http2-require-encryption">does not require</a> the use of encryption so two schemes are available: + <code>h2</code> (HTTP/2 over TLS) and <code>h2c</code> (HTTP/2 over TCP).</p> + + <p>Two useful configuration schemes are:</p> + + <div class="note"><h3>HTTP/2 in a VirtualHost context (TLS only)</h3> + <pre class="prettyprint lang-config">Protocols h2 http/1.1</pre> + + <p>Allows HTTP/2 negotiation (h2) via TLS ALPN in a secure + <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code>. + HTTP/2 preamble checking (Direct mode, see <code class="directive"><a href="#h2direct">H2Direct</a></code>) is disabled by default for <code>h2</code>.</p> + </div> + + <div class="note"><h3>HTTP/2 in a Server context (TLS and cleartext)</h3> + <pre class="prettyprint lang-config">Protocols h2 h2c http/1.1</pre> + + <p>Allows HTTP/2 negotiation (h2) via TLS ALPN for secure + <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code>. Allows + HTTP/2 cleartext negotiation (h2c) upgrading from an initial HTTP/1.1 + connection or via HTTP/2 preamble checking (Direct mode, see + <code class="directive"><a href="#h2direct">H2Direct</a></code>).</p> + </div> + + <p>Refer to the official <a href="https://http2.github.io/faq">HTTP/2 FAQ</a> + for any doubt about the protocol.</p> + + </div> +<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3>Topics</h3> +<ul id="topics"> +<li><img alt="" src="../images/down.gif" /> <a href="#how-it-works">How it works</a></li> +</ul><h3 class="directives">Directives</h3> +<ul id="toc"> +<li><img alt="" src="../images/down.gif" /> <a href="#h2copyfiles">H2CopyFiles</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2direct">H2Direct</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2earlyhints">H2EarlyHints</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="#h2moderntlsonly">H2ModernTLSOnly</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2push">H2Push</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2pushdiarysize">H2PushDiarySize</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2pushpriority">H2PushPriority</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2pushresource">H2PushResource</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2serializeheaders">H2SerializeHeaders</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2streammaxmemsize">H2StreamMaxMemSize</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2tlscooldownsecs">H2TLSCoolDownSecs</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2tlswarmupsize">H2TLSWarmUpSize</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2upgrade">H2Upgrade</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2windowsize">H2WindowSize</a></li> +</ul> +<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_http2">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_http2">Report a bug</a></li></ul><h3>See also</h3> +<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="section"> +<h2><a name="how-it-works" id="how-it-works">How it works</a></h2> + + <h3><a name="dimensioning" id="dimensioning">HTTP/2 Dimensioning</a></h3> + <p> + Enabling HTTP/2 on your Apache Server has impact on the resource + consumption and if you have a busy site, you may need to consider + carefully the implications. + </p> + <p> + The first noticeable thing after enabling HTTP/2 is that your server + processes will start additional threads. The reason for this is that + HTTP/2 gives all requests that it receives to its own <em>Worker</em> + threads for processing, collects the results and streams them out + to the client. + </p> + <p> + In the current implementation, these workers use a separate thread + pool from the MPM workers that you might be familiar with. This is + just how things are right now and not intended to be like this forever. + (It might be forever for the 2.4.x release line, though.) So, HTTP/2 + workers, or shorter H2Workers, will not show up in <code class="module"><a href="../mod/mod_status.html">mod_status</a></code>. They + are also not counted against directives such as <code class="directive"><a href="../mod/mpm_common.html#threadsperchild">ThreadsPerChild</a></code>. However + they take <code class="directive"><a href="../mod/mpm_common.html#threadsperchild">ThreadsPerChild</a></code> + as default if you have not configured something + else via <code class="directive"><a href="#h2minworkers">H2MinWorkers</a></code> and + <code class="directive"><a href="#h2maxworkers">H2MaxWorkers</a></code>. + </p> + <p> + Another thing to watch out for is is memory consumption. Since HTTP/2 + keeps more state on the server to manage all the open request, priorities + for and dependencies between them, it will always need more memory + than HTTP/1.1 processing. There are three directives which steer the + memory footprint of a HTTP/2 connection: + <code class="directive"><a href="#h2maxsessionstreams">H2MaxSessionStreams</a></code>, + <code class="directive"><a href="#h2windowsize">H2WindowSize</a></code> and + <code class="directive"><a href="#h2streammaxmemsize">H2StreamMaxMemSize</a></code>. + </p> + <p> + <code class="directive"><a href="#h2maxsessionstreams">H2MaxSessionStreams</a></code> limits the + number of parallel requests that a client can make on a HTTP/2 connection. + It depends on your site how many you should allow. The default is 100 which + is plenty and unless you run into memory problems, I would keep it this + way. Most requests that browsers send are GETs without a body, so they + use up only a little bit of memory until the actual processing starts. + </p> + <p> + <code class="directive"><a href="#h2windowsize">H2WindowSize</a></code> controls how much + the client is allowed to send as body of a request, before it waits + for the server to encourage more. Or, the other way around, it is the + amount of request body data the server needs to be able to buffer. This + is per request. + </p> + <p> + And last, but not least, <code class="directive"><a href="#h2streammaxmemsize">H2StreamMaxMemSize</a></code> + controls how much response data shall be buffered. The request sits in + a H2Worker thread and is producing data, the HTTP/2 connection tries + to send this to the client. If the client does not read fast enough, + the connection will buffer this amount of data and then suspend the + H2Worker. + </p> + + + <h3><a name="misdirected" id="misdirected">Multiple Hosts and Misdirected Requests</a></h3> + <p> + Many sites use the same TLS certificate for multiple virtual hosts. The + certificate either has a wildcard name, such as '*.example.org' or carries + several alternate names. Browsers using HTTP/2 will recognize that and reuse + an already opened connection for such hosts. + </p> + <p> + While this is great for performance, it comes at a price: such vhosts + need more care in their configuration. The problem is that you will have + multiple requests for multiple hosts on the same TLS connection. And that + makes renegotiation impossible, in face the HTTP/2 standard forbids it. + </p> + <p> + So, if you have several virtual hosts using the same certificate and + want to use HTTP/2 for them, you need to make sure that all vhosts have + exactly the same SSL configuration. You need the same protocol, + ciphers and settings for client verification. + </p> + <p> + If you mix things, Apache httpd will detect it and return a special + response code, 421 Misdirected Request, to the client. + </p> + + + <h3><a name="envvars" id="envvars">Environment Variables</a></h3> + <p> + This module can be configured to provide HTTP/2 related information + as additional environment variables to the SSI and CGI namespace, as well + as in custom log configurations (see <code>%{VAR_NAME}e</code>). + </p> + + <table class="bordered"> + + <tr> + <th><a name="table3">Variable Name:</a></th> + <th>Value Type:</th> + <th>Description:</th> + </tr> + <tr><td><code>HTTP2</code></td><td>flag</td><td>HTTP/2 is being used.</td></tr> + <tr><td><code>H2PUSH</code></td><td>flag</td><td>HTTP/2 Server Push is enabled for this connection and also supported by the client.</td></tr> + <tr><td><code>H2_PUSH</code></td><td>flag</td><td>alternate name for <code>H2PUSH</code></td></tr> + <tr><td><code>H2_PUSHED</code></td><td>string</td><td>empty or <code>PUSHED</code> for a request being pushed by the server.</td></tr> + <tr><td><code>H2_PUSHED_ON</code></td><td>number</td><td>HTTP/2 stream number that triggered the push of this request.</td></tr> + <tr><td><code>H2_STREAM_ID</code></td><td>number</td><td>HTTP/2 stream number of this request.</td></tr> + <tr><td><code>H2_STREAM_TAG</code></td><td>string</td><td>HTTP/2 process unique stream identifier, consisting of connection id and stream id separated by <code>-</code>.</td></tr> + </table> + + + </div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="H2CopyFiles" id="H2CopyFiles">H2CopyFiles</a> <a name="h2copyfiles" id="h2copyfiles">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Determine file handling in responses</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2CopyFiles on|off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2CopyFiles off</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#Status">Status:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.4.24 and later.</td></tr> +</table> + <p> + This directive influences how file content is handled in + responses. When <code>off</code>, which is the default, file handles + are passed from the requestion processing down to the main + connection, using the usual Apache setaside handling for + managing the lifetime of the file. + </p> + <p> + When set to <code>on</code>, file content is copied while the + request is still being processed and the buffered data is passed + on to the main connection. This is better if a third party + module is injecting files with different lifetimes into the response. + </p> + <p> + An example for such a module is <code>mod_wsgi</code> that may place + Python file handles into the response. Those files get close down when + Python thinks processing has finished. That may be well before + <code class="module"><a href="../mod/mod_http2.html">mod_http2</a></code> is done with them. + </p> + +</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 h2c, off for h2 protocol</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_http2</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. + </p> + <p> + 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 is defined in RFC 7540 for the cleartext (h2c) case. Its + use on TLS connections not mandated by the standard. + </p> + <p> + When a server/vhost does not have h2 or h2c enabled via + <code class="directive"><a href="../mod/core.html#protocols">Protocols</a></code>, + the connection is never inspected for a HTTP/2 preamble. + <code class="directive">H2Direct</code> + does not matter then. This is important for connections that + use protocols where an initial read might hang indefinitely, such + as NNTP. + </p> + <p> + For clients that have out-of-band knowledge about a server + supporting h2c, direct HTTP/2 saves the client from having to + perform an HTTP/1.1 upgrade, resulting in better performance + and avoiding the Upgrade restrictions on request bodies. + </p> + <p> + This makes direct h2c attractive for server to server communication + as well, when the connection can be trusted or is secured by other means. + </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="H2EarlyHints" id="H2EarlyHints">H2EarlyHints</a> <a name="h2earlyhints" id="h2earlyhints">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Determine sending of 103 status codes</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2EarlyHints on|off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2EarlyHints 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_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.4.24 and later.</td></tr> +</table> + <p> + This setting controls if HTTP status 103 interim responses are + forwarded to the client or not. By default, this is currently + not the case since a range of clients still have trouble with + unexpected interim responses. + </p> + <p> + When set to <code>on</code>, PUSH resources announced with + <code>H2PushResource</code> will trigger an interim 103 response + before the final response. The 103 response will carry <code>Link</code> + headers that advise the <code>preload</code> of such resources. + </p> + +</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_http2</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_http2</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 class="directive"><a href="#h2minworkers">H2MinWorkers</a></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_http2</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 class="module"><a href="../mod/mod_http2.html">mod_http2</a></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_http2</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 class="module"><a href="../mod/mod_http2.html">mod_http2</a></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="H2ModernTLSOnly" id="H2ModernTLSOnly">H2ModernTLSOnly</a> <a name="h2moderntlsonly" id="h2moderntlsonly">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Require HTTP/2 connections to be "modern TLS" only</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2ModernTLSOnly on|off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2ModernTLSOnly on</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_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.4.18 and later.</td></tr> +</table> + <p> + This directive toggles the security checks on HTTP/2 connections + in TLS mode (https:). This can be used server wide or for specific + <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code>s. + </p> + <p> + The security checks require that the TSL protocol is at least + TLSv1.2 and that none of the ciphers listed in RFC 7540, Appendix A + is used. These checks will be extended once new security requirements + come into place. + </p> + <p> + The name stems from the + <a href="https://wiki.mozilla.org/Security/Server_Side_TLS">Security/Server Side TLS</a> + definitions at mozilla where "modern compatibility" is defined. Mozilla Firefox and + other browsers require modern compatibility for HTTP/2 connections. As everything + in OpSec, this is a moving target and can be expected to evolve in the future. + </p> + <p> + One purpose of having these checks in <code class="module"><a href="../mod/mod_http2.html">mod_http2</a></code> is to enforce this + security level for all connections, not only those from browsers. The other + purpose is to prevent the negotiation of HTTP/2 as a protocol should + the requirements not be met. + </p> + <p> + Ultimately, the security of the TLS connection is determined by the + server configuration directives for <code class="module"><a href="../mod/mod_ssl.html">mod_ssl</a></code>. + </p> + <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">H2ModernTLSOnly off</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="H2Push" id="H2Push">H2Push</a> <a name="h2push" id="h2push">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>H2 Server Push Switch</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2Push on|off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2Push on</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_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.4.18 and later.</td></tr> +</table> + <p> + This directive toggles the usage of the HTTP/2 server push + protocol feature. + </p> + <p> + The HTTP/2 protocol allows the server to push other resources to + a client when it asked for a particular one. This is helpful + if those resources are connected in some way and the client can + be expected to ask for it anyway. The pushing then saves the + time it takes the client to ask for the resources itself. On the + other hand, pushing resources the client never needs or already + has is a waste of bandwidth. + </p> + <p> + Server pushes are detected by inspecting the <code>Link</code> headers of + responses (see https://tools.ietf.org/html/rfc5988 for the + specification). When a link thus specified has the <code>rel=preload</code> + attribute, it is treated as a resource to be pushed. + </p> + <p> + Link headers in responses are either set by the application or + can be configured via <code class="module"><a href="../mod/mod_headers.html">mod_headers</a></code> as: + </p> + <div class="example"><h3>mod_headers example</h3><pre class="prettyprint lang-config"><Location /index.html> + Header add Link "</css/site.css>;rel=preload" + Header add Link "</images/logo.jpg>;rel=preload" +</Location></pre> +</div> + <p> + As the example shows, there can be several link headers added + to a response, resulting in several pushes being triggered. There + are no checks in the module to avoid pushing the same resource + twice or more to one client. Use with care. + </p> + <p> + HTTP/2 server pushes are enabled by default. This directive + allows it to be switch off on all resources of this server/virtual + host. + </p> + <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">H2Push off</pre> +</div> + <p> + Last but not least, pushes happen only when the client signals + its willingness to accept those. Most browsers do, some, like Safari 9, + do not. Also, pushes also only happen for resources from the same + <em>authority</em> as the original response is for. + </p> + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="H2PushDiarySize" id="H2PushDiarySize">H2PushDiarySize</a> <a name="h2pushdiarysize" id="h2pushdiarysize">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>H2 Server Push Diary Size</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2PushDiarySize <em>n</em></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2PushDiarySize 256</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_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.4.19 and later.</td></tr> +</table> + <p> + This directive toggles the maximum number of HTTP/2 server pushes + that are remembered per HTTP/2 connection. This can be used inside the + <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code> + section to influence the number for all connections to that virtual host. + </p> + <p> + The push diary records a digest (currently using a 64 bit number) of pushed + resources (their URL) to avoid duplicate pushes on the same connection. + These value are not persisted, so clients opening a new connection + will experience known pushes again. There is ongoing work to enable + a client to disclose a digest of the resources it already has, so + the diary maybe initialized by the client on each connection setup. + </p> + <p> + If the maximum size is reached, newer entries replace the oldest + ones. A diary entry uses 8 bytes, letting a + default diary with 256 entries consume around 2 KB of memory. + </p> + <p> + A size of 0 will effectively disable the push diary. + </p> + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="H2PushPriority" id="H2PushPriority">H2PushPriority</a> <a name="h2pushpriority" id="h2pushpriority">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>H2 Server Push Priority</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2PushPriority <em>mime-type</em> [after|before|interleaved] [weight]</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2PushPriority * After 16</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_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.4.18 and later. For having an + effect, a nghttp2 library version 1.5.0 or newer is necessary.</td></tr> +</table> + <p> + This directive defines the priority handling of pushed responses + based on the content-type of the response. This is usually defined + per server config, but may also appear in a virtual host. + </p> + <p> + HTTP/2 server pushes are always related to a client request. Each + such request/response pairs, or <em>streams</em> have a dependency + and a weight, together defining the <em>priority</em> of a stream. + </p> + <p> + When a stream <em>depends</em> on another, say X depends on Y, + then Y gets all bandwidth before X gets any. Note that this + does not mean that Y will block X. If Y has no data to send, + all bandwidth allocated to Y can be used by X. + </p> + <p> + When a stream has more than one dependant, say X1 and X2 both + depend on Y, the <em>weight</em> determines the bandwidth + allocation. If X1 and X2 have the same weight, they both get + half of the available bandwidth. If the weight of X1 is twice + as large as that for X2, X1 gets twice the bandwidth of X2. + </p> + <p> + Ultimately, every stream depends on the <em>root</em> stream which + gets all the bandwidth available, but never sends anything. So all + its bandwidth is distributed by weight among its children. Which + either have data to send or distribute the bandwidth to their + own children. And so on. If none of the children have data + to send, that bandwidth get distributed somewhere else according + to the same rules. + </p> + <p> + The purpose of this priority system is to always make use of + available bandwidth while allowing precedence and weight + to be given to specific streams. Since, normally, all streams + are initiated by the client, it is also the one that sets + these priorities. + </p> + <p> + Only when such a stream results in a PUSH, gets the server to + decide what the <em>initial</em> priority of such a pushed + stream is. In the examples below, X is the client stream. It + depends on Y and the server decides to PUSH streams P1 and P2 + onto X. + </p> + <p> + The default priority rule is: + </p> + <div class="example"><h3>Default Priority Rule</h3><pre class="prettyprint lang-config">H2PushPriority * After 16</pre> +</div> + <p> + which reads as 'Send a pushed stream of any content-type + depending on the client stream with weight 16'. And so P1 + and P2 will be send after X and, as they have equal weight, + share bandwidth equally among themselves. + </p> + <div class="example"><h3>Interleaved Priority Rule</h3><pre class="prettyprint lang-config">H2PushPriority text/css Interleaved 256</pre> +</div> + <p> + which reads as 'Send any CSS resource on the same dependency and + weight as the client stream'. If P1 has content-type 'text/css', + it will depend on Y (as does X) and its effective weight will be + calculated as <code>P1ew = Xw * (P1w / 256)</code>. With P1w being + 256, this will make the effective weight the same as the weight + of X. If both X and P1 have data to send, bandwidth will be allocated + to both equally. + </p> + <p> + With Pw specified as 512, a pushed, interleaved stream would + get double the weight of X. With 128 only half as much. Note that + effective weights are always capped at 256. + </p> + <div class="example"><h3>Before Priority Rule</h3><pre class="prettyprint lang-config">H2PushPriority application/json Before</pre> +</div> + <p> + This says that any pushed stream of content type 'application/json' + should be send out <em>before</em> X. This makes P1 dependent + on Y and X dependent on P1. So, X will be stalled as long as + P1 has data to send. The effective weight is inherited from the + client stream. Specifying a weight is not allowed. + </p> + <p> + Be aware that the effect of priority specifications is limited + by the available server resources. If a server does not have + workers available for pushed streams, the data for the stream + may only ever arrive when other streams have been finished. + </p> + <p> + Last, but not least, there are some specifics of the syntax + to be used in this directive: + </p> + <ol> + <li>'*' is the only special content-type that matches all others. + 'image/*' will not work.</li> + <li>The default dependency is 'After'. </li> + <li>There are also default weights: for 'After' it is 16, 'interleaved' is 256. + </li> + </ol> + <div class="example"><h3>Shorter Priority Rules</h3><pre class="prettyprint lang-config">H2PushPriority application/json 32 # an After rule +H2PushPriority image/jpeg before # weight inherited +H2PushPriority text/css interleaved # weight 256 default</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="H2PushResource" id="H2PushResource">H2PushResource</a> <a name="h2pushresource" id="h2pushresource">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Declares resources for early pushing to the client</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2PushResource [add] path [critical]</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#Status">Status:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.4.24 and later.</td></tr> +</table> + <p> + When added to a directory/location HTTP/2 PUSHes will be attempted + for all paths added via this directive. This directive can be used + several times for the same location. + </p> + <p> + This directive pushes resources much earlier than adding + <code>Link</code> headers via <code class="module"><a href="../mod/mod_headers.html">mod_headers</a></code>. + <code class="module"><a href="../mod/mod_http2.html">mod_http2</a></code> announces these resources in a + <code>103 Early Hints</code> interim response to the client. + That means that clients not supporting PUSH will still get + early preload hints. + </p> + <p> + In contrast to setting <code>Link</code> response headers + via <code class="module"><a href="../mod/mod_headers.html">mod_headers</a></code>, this directive will only + take effect on HTTP/2 connections. + </p> + <p> + By adding <code>critical</code> to such a resource, the server + will give processing it more preference and send its data, once + available, before the data from the main request. + </p> + +</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/Response 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_http2</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="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_http2</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="H2TLSCoolDownSecs" id="H2TLSCoolDownSecs">H2TLSCoolDownSecs</a> <a name="h2tlscooldownsecs" id="h2tlscooldownsecs">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td /></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2TLSCoolDownSecs <em>seconds</em></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2TLSCoolDownSecs 1</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_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.4.18 and later.</td></tr> +</table> + <p> + This directive sets the number of seconds of idle time on a TLS + connection before the TLS write size falls back to small (~1300 bytes) + length. + This can be used server wide or for specific + <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code>s. + </p> + <p> + See <code class="directive"><a href="#h2tlswarmupsize">H2TLSWarmUpSize</a></code> for a + description of TLS warmup. <code class="directive">H2TLSCoolDownSecs</code> reflects the fact + that connections may deteriorate over time (and TCP flow adjusts) + for idle connections as well. It is beneficial to overall performance + to fall back to the pre-warmup phase after a number of seconds that + no data has been sent. + </p> + <p> + In deployments where connections can be considered reliable, this + timer can be disabled by setting it to 0. + </p> + <p> + The following example sets the seconds to zero, effectively disabling + any cool down. Warmed up TLS connections stay on maximum record + size. + </p> + <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">H2TLSCoolDownSecs 0</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="H2TLSWarmUpSize" id="H2TLSWarmUpSize">H2TLSWarmUpSize</a> <a name="h2tlswarmupsize" id="h2tlswarmupsize">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td /></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2TLSWarmUpSize <em>amount</em></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2TLSWarmUpSize 1048576</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_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.4.18 and later.</td></tr> +</table> + <p> + This directive sets the number of bytes to be sent in small + TLS records (~1300 bytes) until doing maximum sized writes (16k) + on https: HTTP/2 connections. + This can be used server wide or for specific + <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code>s. + </p> + <p> + Measurements by <a href="https://www.igvita.com">google performance + labs</a> show that best performance on TLS connections is reached, + if initial record sizes stay below the MTU level, to allow a + complete record to fit into an IP packet. + </p> + <p> + While TCP adjust its flow-control and window sizes, longer TLS + records can get stuck in queues or get lost and need retransmission. + This is of course true for all packets. TLS however needs the + whole record in order to decrypt it. Any missing bytes at the end + will stall usage of the received ones. + </p> + <p> + After a sufficient number of bytes have been send successfully, + the TCP state of the connection is stable and maximum TLS record + sizes (16 KB) can be used for optimal performance. + </p> + <p> + In deployments where servers are reached locally or over reliable + connections only, the value might be decreased with 0 disabling + any warmup phase altogether. + </p> + <p> + The following example sets the size to zero, effectively disabling + any warmup phase. + </p> + <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">H2TLSWarmUpSize 0</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="H2Upgrade" id="H2Upgrade">H2Upgrade</a> <a name="h2upgrade" id="h2upgrade">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>H2 Upgrade Protocol Switch</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>H2Upgrade on|off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>H2Upgrade on for h2c, off for h2 protocol</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_http2</td></tr> +</table> + <p> + This directive toggles the usage of the HTTP/1.1 Upgrade method + for switching to HTTP/2. This + should be used inside a + <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code> + section to enable Upgrades to HTTP/2 for that virtual host. + </p> + <p> + This method of switching protocols is defined in HTTP/1.1 and + uses the "Upgrade" header (thus the name) to announce willingness + to use another protocol. This may happen on any request of a + HTTP/1.1 connection. + </p> + <p> + This method of protocol switching is enabled by default on cleartext + (potential h2c) connections and disabled on TLS (potential h2), + as mandated by RFC 7540. + </p> + <p> + Please be aware that Upgrades are only accepted for requests + that carry no body. POSTs and PUTs with content will never + trigger an upgrade to HTTP/2. + See <code class="directive"><a href="#h2direct">H2Direct</a></code> for an + alternative to Upgrade. + </p> + <p> + This mode only has an effect when h2 or h2c is enabled via + the <code class="directive"><a href="../mod/core.html#protocols">Protocols</a></code>. + </p> + <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">H2Upgrade 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="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 65535</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_http2</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_http2.html" title="English"> en </a> | +<a href="../fr/mod/mod_http2.html" hreflang="fr" rel="alternate" title="Français"> fr </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> +<script type="text/javascript"><!--//--><![CDATA[//><!-- +var comments_shortname = 'httpd'; +var comments_identifier = 'http://httpd.apache.org/docs/2.4/mod/mod_http2.html'; +(function(w, d) { + if (w.location.hostname.toLowerCase() == "httpd.apache.org") { + d.write('<div id="comments_thread"><\/div>'); + var s = d.createElement('script'); + s.type = 'text/javascript'; + s.async = true; + s.src = 'https://comments.apache.org/show_comments.lua?site=' + comments_shortname + '&page=' + comments_identifier; + (d.getElementsByTagName('head')[0] || d.getElementsByTagName('body')[0]).appendChild(s); + } + else { + d.write('<div id="comments_thread">Comments are disabled for this page at the moment.<\/div>'); + } +})(window, document); +//--><!]]></script></div><div id="footer"> +<p class="apache">Copyright 2019 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p> +<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[//><!-- +if (typeof(prettyPrint) !== 'undefined') { + prettyPrint(); +} +//--><!]]></script> +</body></html>
\ No newline at end of file diff --git a/docs/manual/mod/mod_http2.html.fr.utf8 b/docs/manual/mod/mod_http2.html.fr.utf8 new file mode 100644 index 0000000..ef9a962 --- /dev/null +++ b/docs/manual/mod/mod_http2.html.fr.utf8 @@ -0,0 +1,1031 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml" lang="fr" xml:lang="fr"><head> +<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" /> +<!-- + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + This file is generated from xml source: DO NOT EDIT + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + --> +<title>mod_http2 - Serveur HTTP Apache Version 2.4</title> +<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> +<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> +<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" /> +<script src="../style/scripts/prettify.min.js" type="text/javascript"> +</script> + +<link href="../images/favicon.ico" rel="shortcut icon" /></head> +<body> +<div id="page-header"> +<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">Glossaire</a> | <a href="../sitemap.html">Plan du site</a></p> +<p class="apache">Serveur HTTP Apache Version 2.4</p> +<img alt="" src="../images/feather.png" /></div> +<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div> +<div id="path"> +<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">Serveur HTTP</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>Module Apache mod_http2</h1> +<div class="toplang"> +<p><span>Langues Disponibles: </span><a href="../en/mod/mod_http2.html" hreflang="en" rel="alternate" title="English"> en </a> | +<a href="../fr/mod/mod_http2.html" title="Français"> fr </a></p> +</div> +<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Support de la couche transport HTTP/2</td></tr> +<tr><th><a href="module-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="module-dict.html#ModuleIdentifier">Identificateur de Module:</a></th><td>http2_module</td></tr> +<tr><th><a href="module-dict.html#SourceFile">Fichier Source:</a></th><td>mod_http2.c</td></tr> +<tr><th><a href="module-dict.html#Compatibility">CompatibilitĂ©:</a></th><td>Disponible Ă partir de la version 2.4.17 du serveur + HTTP Apache</td></tr></table> +<h3>Sommaire</h3> + + <p>Ce module ajoute le support de HTTP/2 (<a href="https://tools.ietf.org/html/rfc7540">RFC 7540</a>) au serveur HTTP + Apache.</p> + + <p>Il s'appuie sur la bibliothĂšque <a href="http://nghttp2.org/">libnghttp2</a> pour implĂ©menter le + moteur de base http/2.</p> + + <p>Pour mettre en oeuvre les fonctionnalitĂ©s dĂ©crites dans ce + document, vous devez activer HTTP/2 en utilisant la directive + <code class="directive"><a href="../mod/core.html#protocols">Protocols</a></code>. HTTP/2 <a href="https://http2.github.io/faq/#does-http2-require-encryption">n'imposant + pas</a> de chiffrement, deux protocoles sont disponibles : + <code>h2</code> (HTTP/2 avec TLS) at <code>h2c</code> (HTTP/2 avec TCP).</p> + + <p>Voici deux types de configuration courant :</p> + + <div class="note"><h3>HTTP/2 dans un contexte de serveur virtuel (TLS seulement)</h3> + <pre class="prettyprint lang-config">Protocols h2 http/1.1</pre> + + <p>Permet une nĂ©gociation HTTP/2 (h2) via TLS ALPN au sein d'un + <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code> + sĂ©curisĂ©. La vĂ©rification du prĂ©ambule HTTP/2 (mode direct, voir + <code class="directive"><a href="#h2direct">H2Direct</a></code>) est dĂ©sactivĂ©e par + dĂ©faut pour <code>h2</code>.</p> + </div> + + <div class="note"><h3>HTTP/2 dans un contexte de serveur (TLS et texte pur)</h3> + <pre class="prettyprint lang-config">Protocols h2 h2c http/1.1</pre> + + <p>Permet une nĂ©gociation HTTP/2 (h2) via TLS ALPN au sein d'un + <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code> + sĂ©curisĂ©. Permet aussi une nĂ©gociation HTTP/2 en texte pur (h2c) en + effectuant une mise Ă jour depuis une connexion initiale HTTP/1.1 ou via + une vĂ©rification du prĂ©ambule HTTP/2 (mode direct, voir + <code class="directive"><a href="#h2direct">H2Direct</a></code>).</p> + </div> + + <p>Si vous avez besoin d'informations supplĂ©mentaires Ă propos du + protocole, veuillez vous reporter Ă la <a href="https://http2.github.io/faq">HTTP/2 FAQ</a>.</p> + + + </div> +<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3>Sujets</h3> +<ul id="topics"> +<li><img alt="" src="../images/down.gif" /> <a href="#how-it-works">Comment ça marche ?</a></li> +</ul><h3 class="directives">Directives</h3> +<ul id="toc"> +<li><img alt="" src="../images/down.gif" /> <a href="#h2copyfiles">H2CopyFiles</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2direct">H2Direct</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2earlyhints">H2EarlyHints</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="#h2moderntlsonly">H2ModernTLSOnly</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2push">H2Push</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2pushdiarysize">H2PushDiarySize</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2pushpriority">H2PushPriority</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2pushresource">H2PushResource</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2serializeheaders">H2SerializeHeaders</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2streammaxmemsize">H2StreamMaxMemSize</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2tlscooldownsecs">H2TLSCoolDownSecs</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2tlswarmupsize">H2TLSWarmUpSize</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2upgrade">H2Upgrade</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#h2windowsize">H2WindowSize</a></li> +</ul> +<h3>Traitement des bugs</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">Journal des modifications de httpd</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_http2">ProblĂšmes connus</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_http2">Signaler un bug</a></li></ul><h3>Voir aussi</h3> +<ul class="seealso"> +<li><a href="#comments_section">Commentaires</a></li></ul></div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="section"> +<h2><a name="how-it-works" id="how-it-works">Comment ça marche ?</a></h2> + + <h3><a name="dimensioning" id="dimensioning">Quantification des ressources + supplĂ©mentaires nĂ©cessaires Ă HTTP/2</a></h3> + <p> + Activer HTTP/2 sur votre serveur Apache a un impact sur la + consommation de ressources, et si votre site est trĂšs actif, il est + conseillĂ© d'en prendre sĂ©rieusement en compte les implications. + </p> + <p> + HTTP/2 attribue Ă chaque requĂȘte qu'il reçoit son propre <em>thread + de travail</em> pour son traitement, la collecte des rĂ©sultats et + l'envoie de ces derniers au client. Pour y parvenir, il lui faut + lancer des threads supplĂ©mentaires, et ceci constituera le premier + effet notable de l'activation de HTTP/2. + </p> + <p> + Dans l'implĂ©mentation actuelle, ces threads de travail font partie + d'un jeu de threads distinct de celui des threads de travail du MPM + avec lequel vous ĂȘtes familiĂ©. Il s'agit simplement du mode de + fonctionnement actuel, et il n'en sera pas obligatoirement toujours + ainsi (il est cependant probable que la situation restera inchangĂ©e + avec la version 2.4.x). De par ce mode de fonctionnement, les + threads de travail HTTP/2, ou plus simplement H2 ne seront pas + affichĂ©s par <code class="module"><a href="../mod/mod_status.html">mod_status</a></code>. De mĂȘme, ils ne seront pas + pris en compte par les directives du style <code class="directive"><a href="../mod/mpm_common.html#threadsperchild">ThreadsPerChild</a></code>. Par contre, ils + utilisent par dĂ©faut la valeur de <code class="directive"><a href="../mod/mpm_common.html#threadsperchild">ThreadsPerChild</a></code> si vous n'avez pas + spĂ©cifiĂ© d'autres valeurs via <code class="directive"><a href="#h2minworkers">H2MinWorkers</a></code> et <code class="directive"><a href="#h2maxworkers">H2MaxWorkers</a></code>. + </p> + <p> + Autre changement Ă surveiller : la consommation de mĂ©moire. En + effet, comme HTTP/2 conserve plus d'informations sur le serveur pour + gĂ©rer toutes les requĂȘtes en cours, leurs prioritĂ©s et + interdĂ©pendances, il aura toujours besoin de plus de mĂ©moire que + pour un traitement en HTTP/1.1. Trois directives permettent de + limiter l'empreinte mĂ©moire d'une connexion HTTP/2 : <code class="directive"><a href="#h2maxsessionstreams">H2MaxSessionStreams</a></code>, <code class="directive"><a href="#h2windowsize">H2WindowSize</a></code> et <code class="directive"><a href="#h2streammaxmemsize">H2StreamMaxMemSize</a></code>. + </p> + <p> + La directive <code class="directive"><a href="#h2maxsessionstreams">H2MaxSessionStreams</a></code> permet de limiter + le nombre de requĂȘtes simultanĂ©es qu'un client peut envoyer sur une + connexion HTTP/2. La valeur que vous allez dĂ©finir dĂ©pend de votre + site. La valeur par dĂ©faut qui est de 100 est largement suffisante, + et Ă moins que vous ne soyez un peu juste en mĂ©moire, je vous + conseille de ne pas la modifier. La plupart des requĂȘtes qu'envoie + un client sont des requĂȘtes de type GET sans corps qui n'utilisent + que trĂšs peu de mĂ©moire en attendant le dĂ©marrage du traitement. + + </p> + <p> + La directive <code class="directive"><a href="#h2windowsize">H2WindowSize</a></code> + permet de dĂ©finir la taille maximale que peut avoir le corps d'une + requĂȘte que le client envoie avant d'attendre que le serveur + en demande d'avantage. En d'autres termes, il s'agit de la quantitĂ© + de donnĂ©es que le serveur peut stocker dans son tampon, valable pour + une requĂȘte. + </p> + <p> + En outre, la directive <code class="directive"><a href="#h2streammaxmemsize">H2StreamMaxMemSize</a></code> permet de dĂ©finir + la quantitĂ© de donnĂ©es de la rĂ©ponse qui doit ĂȘtre mise en tampon. + Chaque requĂȘte Ă©tant prise en charge par un thread H2Worker et + produisant des donnĂ©es que le serveur tente de transmettre au client + via une connexion HTTP/2, si le client n'est pas en mesure de lire + ces donnĂ©es assez rapidement, la connexion les mettra en tampon et + interrompra l'exĂ©cution du thread H2Worker correspondant. + </p> + + + + <h3><a name="misdirected" id="misdirected">Serveurs virtuels et requĂȘtes mal + redirigĂ©es</a></h3> + <p> + De nombreux site utilisent le mĂȘme certificat TLS pour plusieurs + serveurs virtuels. Ce certificat rĂ©fĂ©rence un nom de serveur + gĂ©nĂ©rique comme '*.example.org' ou plusieurs noms de serveur + diffĂ©rents. Les navigateurs qui utilisent HTTP/2 dĂ©tectent ce + comportement et rĂ©utilisent une connexion dĂ©jĂ ouverte pour ces + serveurs. + </p> + <p> + Ceci amĂ©liore considĂ©rablement les performances, mais il y a un prix + Ă payer : il faut accorder un soin tout particulier Ă la + configuration de tels serveurs virtuels. Le problĂšme rĂ©side dans le + fait que plusieurs requĂȘtes pour plusieurs serveurs virtuels vont se + partager la mĂȘme connexion TLS, et ceci empĂȘche toute renĂ©gociation + car le standard HTTP/2 l'interdit. + </p> + <p> + Ainsi, lorsque plusieurs de vos serveurs virtuels utilisent le mĂȘme + certificat et si vous souhaitez utiliser HTTP/2 pour y accĂ©der, vous + devez vous assurer que tous vos serveurs virtuels possĂšdent + exactement la mĂȘme configuration SSL. En particulier, ils doivent + utiliser les mĂȘmes protocole, algorithme de chiffrement et + configuration pour la vĂ©rification du client. + </p> + <p> + Dans le cas contraire, Apache httpd le dĂ©tectera et renverra au + client un code de rĂ©ponse spĂ©cial, 421 Misdirected Request. + </p> + + + <h3><a name="envvars" id="envvars">Variables d'environnement</a></h3> + + <p>Ce module peut ĂȘtre configurĂ© pour fournir des informations en + rapport avec HTTP/2 sous la forme de variables d'environnement + supplĂ©mentaires dans l'espace de nommage SSI et CGI, ainsi que dans les + configurations personnalisĂ©es de le journalisation (voir + <code>%{VAR_NAME}e</code>). + </p> + + <table class="bordered"> + + <tr> + <th><a name="table3">Nom variable :</a></th> + <th>Type :</th> + <th>Description :</th> + </tr> + <tr><td><code>HTTPe</code></td><td>drapeau</td><td>HTTP/2 est utilisĂ©.</td></tr> + <tr><td><code>H2PUSH</code></td><td>drapeau</td><td>La + fonctionnalitĂ© HTTP/2 Server Push est activĂ©e pour cette requĂȘte et + supportĂ©e par le client.</td></tr> + <tr><td><code>H2_PUSH</code></td><td>drapeau</td><td>autre nom pour <code>H2PUSH</code></td></tr> + <tr><td><code>H2_PUSHED</code></td><td>chaĂźne</td><td>vide ou + <code>PUSHED</code> pour une requĂȘte pushĂ©e par le serveur.</td></tr> + <tr><td><code>H2_PUSHED_ON</code></td><td>nombre</td><td>numĂ©ro du + flux HTTP/2 qui a dĂ©clenchĂ© le push de cette requĂȘte.</td></tr> + <tr><td><code>H2_STREAM_ID</code></td><td>nombre</td><td>numĂ©ro du + flux HTTP/2 de cette requĂȘte.</td></tr> + <tr><td><code>H2_STREAM_TAG</code></td><td>chaĂźne</td><td>identifiant + de flux unique du processus HTTP/2 composĂ© de l'identifiant de la + connexion et de l'identifiant du flux sĂ©parĂ©s par <code>-</code>.</td></tr> + </table> + + + </div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="h2copyfiles" id="h2copyfiles">Directive</a> <a name="H2CopyFiles" id="H2CopyFiles">H2CopyFiles</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>ContrĂŽle la gestion des fichiers dans les rĂ©ponses</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2CopyFiles on|off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">DĂ©faut:</a></th><td><code>H2CopyFiles off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel, rĂ©pertoire, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">CompatibilitĂ©:</a></th><td>Disponible Ă partir de la version 2.4.24 du serveur HTTP + Apache.</td></tr> +</table> + <p> + Cette directive permet de dĂ©finir la maniĂšre de gĂ©rer les + contenus de fichiers dans les rĂ©ponses. Lorsqu'elle est Ă <code>off</code> + (sa valeur par dĂ©faut), les descripteurs de fichiers sont + transmis par le processus de traitement de la requĂȘte vers la + connexion principale en utilisant le systĂšme habituel de mise en + rĂ©serve d'Apache pour gĂ©rer le durĂ©e de vie du fichier. + </p> + <p> + Lorsqu'elle est Ă <code>on</code>, le contenu du fichier est + recopier pendant le traitement de la requĂȘte et ces donnĂ©es + mises en tampon sont transmises vers la connexion principale, ce + qui s'avĂšre avantageux lorsqu'un module tiers injecte dans la + rĂ©ponse des fichiers possĂ©dant des durĂ©es de vie diffĂ©rentes. + </p> + <p> + Un exemple de ces modules tiers : <code>mod_wsgi</code> qui peut + injecter des descripteurs de fichiers dans la rĂ©ponse. Ces + fichiers sont fermĂ©s lorsque Python estime que le traitement est + terminĂ©, alors que <code class="module"><a href="../mod/mod_http2.html">mod_http2</a></code> est probablement + encore loin d'en avoir fini avec eux. + </p> + +</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">Directive</a> <a name="H2Direct" id="H2Direct">H2Direct</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Activation du protocole H2 Direct</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2Direct on|off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">DĂ©faut:</a></th><td><code>H2Direct on pour h2c, off pour le protocole h2</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +</table> + <p> + Cette directive permet d'activer/dĂ©sactiver + l'utilisation du mode HTTP/2 Direct. Elle doit ĂȘtre + situĂ©e dans une section <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code> afin d'activer la + communication directe HTTP/2 pour le serveur virtuel + considĂ©rĂ©. + </p> + <p> + La notion de communication directe signifie que si les + premiers octets reçus par le serveur correspondent Ă un + en-tĂȘte HTTP/2, le protocole HTTP/2 est utilisĂ© sans + nĂ©gociation supplĂ©mentaire. Ce mode est dĂ©fini pour + les transmissions en clair (h2c) dans la RFC 7540. Son + utilisation avec les connexions TLS n'est pas + officiellement supportĂ©e. + </p> + <p> + Lorsque le protocole h2 ou h2c n'est pas activĂ© via la + directive <code class="directive"><a href="../mod/core.html#protocols">Protocols</a></code>, la recherche d'un en-tĂȘte HTTP/2 n'est + jamais effectuĂ©e au sein d'une connexion. La directive + <code class="directive">H2Direct</code> ne produit alors aucun effet. Ceci est + important pour les connexions qui utilisent un protocole + pour lequel une lecture initiale peut entraĂźner un + blocage dĂ©finitif comme NNTP. + </p> + <p> + Pour un client qui sait qu'un serveur supporte h2c, la + communication directe HTTP/2 dispense le client d'une + mise Ă jour HTTP/1.1, ce qui entraĂźne une amĂ©lioration + des performances et Ă©vite les restrictions sur les corps + de requĂȘte suite Ă une mise Ă jour. + </p> + <p> + Cette directive rend aussi h2c plus attractif pour les + communications de serveur Ă serveur lorsque la connexion + est sure ou peut ĂȘtre sĂ©curisĂ©e d'une maniĂšre ou d'une + autre. + </p> + <div class="example"><h3>Exemple</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="h2earlyhints" id="h2earlyhints">Directive</a> <a name="H2EarlyHints" id="H2EarlyHints">H2EarlyHints</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>ContrĂŽle l'envoi de codes d'Ă©tat 103</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2EarlyHints on|off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">DĂ©faut:</a></th><td><code>H2EarlyHints off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">CompatibilitĂ©:</a></th><td>Disponible Ă partir de la version 2.4.24 du serveur HTTP + Apache.</td></tr> +</table> + <p> + Cette directive permet de dĂ©finir si les rĂ©ponses intermĂ©diaires + contenant un code d'Ă©tat HTTP 103 doivent ĂȘtre envoyĂ©es au + client ou non. Par dĂ©faut ce n'est actuellement pas le cas car + certains clients ont encore des problĂšmes avec les rĂ©ponses + intermĂ©diaires inattendues. + </p> + <p> + Lorsque cette directive est dĂ©finie Ă <code>on</code>, les + ressources PUSHĂ©es dĂ©finie par la directive + <code>H2PushResource</code> dĂ©clenchent une rĂ©ponse + intermĂ©diaire 103 avant la rĂ©ponse finale. Cette rĂ©ponse 103 + comporte des en-tĂȘtes <code>Link</code> qui provoquent le + <code>prĂ©chargement</code> des ressources considĂ©rĂ©es. + </p> + +</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">Directive</a> <a name="H2MaxSessionStreams" id="H2MaxSessionStreams">H2MaxSessionStreams</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Nombre maximal de flux actifs par session HTTP/2.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2MaxSessionStreams <em>n</em></code></td></tr> +<tr><th><a href="directive-dict.html#Default">DĂ©faut:</a></th><td><code>H2MaxSessionStreams 100</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +</table> + <p> + Cette directive permet de dĂ©finir le nombre maximal de flux + actifs par session (connexion) HTTP/2 acceptĂ© par le serveur. + Selon la RFC 7540, un flux est considĂ©rĂ© comme actif s'il n'est + ni <code>en attente</code> ni <code>fermĂ©</code>. + </p> + <div class="example"><h3>Exemple</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">Directive</a> <a name="H2MaxWorkerIdleSeconds" id="H2MaxWorkerIdleSeconds">H2MaxWorkerIdleSeconds</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Nombre maximal de secondes pendant lequel une unitĂ© de + traitement h2 pourra rester inactive sans ĂȘtre arrĂȘtĂ©e.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2MaxWorkerIdleSeconds <em>n</em></code></td></tr> +<tr><th><a href="directive-dict.html#Default">DĂ©faut:</a></th><td><code>H2MaxWorkerIdleSeconds 600</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +</table> + <p> + Cette directive permet de dĂ©finir le nombre maximal de secondes + pendant lequel une unitĂ© de traitement h2 pourra rester inactive + avant de s'arrĂȘter elle-mĂȘme. Cet arrĂȘt ne peut cependant se + produire que si le nombre d'unitĂ©s de traitement h2 dĂ©passe + <code class="directive"><a href="#h2minworkers">H2MinWorkers</a></code>. + </p> + <div class="example"><h3>Exemple</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">Directive</a> <a name="H2MaxWorkers" id="H2MaxWorkers">H2MaxWorkers</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Nombre maximal de threads Ă utiliser pour chaque processus + enfant.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2MaxWorkers <em>n</em></code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +</table> + <p> + Cette directive permet de dĂ©finir le nombre maximal de threads Ă + lancer pour le traitement HTTP/2 de chaque processus enfant. Si + cette directive n'est pas dĂ©finie, <code class="module"><a href="../mod/mod_http2.html">mod_http2</a></code> + choisira une valeur appropriĂ©e en fonction du module <code>mpm</code> + utilisĂ©. + + 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_http2</code> will chose a value suitable for the <code>mpm</code> + module loaded. + </p> + <div class="example"><h3>Exemple</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">Directive</a> <a name="H2MinWorkers" id="H2MinWorkers">H2MinWorkers</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Nombre minimal de threads Ă utiliser pour chaque processus + enfant.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2MinWorkers <em>n</em></code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +</table> + <p> + Cette directive permet de dĂ©finir le nombre minimal de threads Ă + lancer pour le traitement HTTP/2 de chaque processus enfant. Si + cette directive n'est pas dĂ©finie, <code class="module"><a href="../mod/mod_http2.html">mod_http2</a></code> + choisira une valeur appropriĂ©e en fonction du module <code>mpm</code> + utilisĂ©. + </p> + <div class="example"><h3>Exemple</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="h2moderntlsonly" id="h2moderntlsonly">Directive</a> <a name="H2ModernTLSOnly" id="H2ModernTLSOnly">H2ModernTLSOnly</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Impose les connexions HTTP/2 en mode "TLS moderne" + seulement</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2ModernTLSOnly on|off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">DĂ©faut:</a></th><td><code>H2ModernTLSOnly on</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">CompatibilitĂ©:</a></th><td>Disponible Ă partir de la version 2.4.18 du serveur HTTP + Apache.</td></tr> +</table> + <p> + Cette directive permet de dĂ©finir si les vĂ©rifications de + sĂ©curitĂ© sur les connexions HTTP/2 doivent ĂȘtre exclusivement en + mode TLS (https:). Elle peut ĂȘtre placĂ©e au niveau du serveur + principal ou dans une section <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code>. + </p> + <p> + Les vĂ©rifications de sĂ©curitĂ© nĂ©cessitent TLSv1.2 au minimum et + l'absence de tout algorithme de chiffrement listĂ© dans la RFC + 7540, Appendix A. Ces vĂ©rifications seront Ă©tendues lorsque de + nouveaux prĂ©requis en matiĂšre de sĂ©curitĂ© seront mis en place. + </p> + <p> + Le nom provient des dĂ©finitions Mozilla <a href="https://wiki.mozilla.org/Security/Server_Side_TLS">Security/Server + Side TLS</a> oĂč il est question de "modern compatibility". + Mozilla Firefox et d'autres navigateurs imposent la "modern + compatibility" pour les connexions HTTP/2. Comme toute chose en + matiĂšre de sĂ©curitĂ© opĂ©rationnelle, c'est une cible mouvante + susceptible d'Ă©voluer dans le futur. + </p> + <p> + Un des buts de ces vĂ©rifications dans <code class="module"><a href="../mod/mod_http2.html">mod_http2</a></code> tend Ă imposer + ce niveau de sĂ©curitĂ© pour toutes les connexions, et non + seulement celles en provenance des navigateurs web. Un autre but + est l'interdiction d'utiliser HTTP/2 en tant que protocole dans + les nĂ©gociations si les prĂ©requis ne sont pas respectĂ©s. + </p> + <p> + En fin de compte, la sĂ©curitĂ© de la connexion TLS est dĂ©terminĂ©e + par les directives de configuration du serveur pour <code class="module"><a href="../mod/mod_ssl.html">mod_ssl</a></code>. + </p> + <div class="example"><h3>Exemple</h3><pre class="prettyprint lang-config">H2ModernTLSOnly off</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="h2push" id="h2push">Directive</a> <a name="H2Push" id="H2Push">H2Push</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Activation/dĂ©sactivation du server push H2</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2Push on|off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">DĂ©faut:</a></th><td><code>H2Push on</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">CompatibilitĂ©:</a></th><td>Disponible Ă partir de la version 2.4.18 du serveur HTTP + Apache.</td></tr> +</table> + <p> + Cette directive permet d'activer/dĂ©sactiver + l'utilisation de la fonctionnalitĂ© server push du + protocole HTTP/2. + </p> + <p> + Lorsqu'un client demande une ressource particuliĂšre, le + protocole HTTP/2 permet au serveur de lui fournir des + ressources supplĂ©mentaires. Ceci s'avĂšre utile lorsque + ces ressources sont reliĂ©es entre elles, ce qui peut + laisser supposer que le client va probablement les + demander dans un dĂ©lai plus ou moins long. Le mĂ©canisme + de pushing permet alors au client d'Ă©conomiser le temps + qu'il lui aurait fallu pour demander ces ressources + supplĂ©mentaires lui-mĂȘme. Par contre, fournir au client + des ressources dont il n'a pas besoin ou qu'il possĂšde + dĂ©jĂ constitue une perte de bande passante. + </p> + <p> + Les server pushes sont dĂ©tectĂ©s en inspectant les + en-tĂȘtes <code>Link</code> des rĂ©ponses (voir + https://tools.ietf.org/html/rfc5988 pour la + spĂ©cification). Lorsqu'un lien spĂ©cifiĂ© de cette maniĂšre + possĂšde l'attribut <code>rel=preload</code>, il est + considĂ©rĂ© comme devant faire l'objet d'un push. + </p> + <p> + Les en-tĂȘtes link des rĂ©ponses sont soit dĂ©finis par + l'application, soit configurĂ©s via + <code class="module"><a href="../mod/mod_headers.html">mod_headers</a></code> comme suit : + </p> + <div class="example"><h3>Exemple de configuration d'en-tĂȘte link via mod_headers</h3><pre class="prettyprint lang-config"><Location /index.html> + Header add Link "</css/site.css>;rel=preload" + Header add Link "</images/logo.jpg>;rel=preload" +</Location></pre> +</div> + <p> + Comme le montre l'exemple, il est possible d'ajouter + autant d'en-tĂȘtes link que l'on souhaite Ă une rĂ©ponse, ce qui dĂ©clenchera + autant de pushes. Cette fonctionnalitĂ© doit donc ĂȘtre + utilisĂ©e avec prudence car le module ne vĂ©rifie pas si + une ressource n'a pas dĂ©jĂ Ă©tĂ© "pushĂ©e" vers un client. + </p> + <p> + Les server pushes HTTP/2 sont activĂ©s par dĂ©faut. Cette + directive permet de dĂ©sactiver cette fonctionnalitĂ© pour + le serveur virtuel ou non considĂ©rĂ©. + </p> + <div class="example"><h3>Exemple</h3><pre class="prettyprint lang-config">H2Push off</pre> +</div> + <p> + Enfin, il est important de savoir que les pushes ne se + produisent que si le client en manifeste le dĂ©sir ; la + plupart des navigateurs le font, mais certains, comme + Safari 9, ne le font pas. En outre, les pushes ne se produisent que + pour les ressources de la mĂȘme <em>autoritĂ©</em> que celle de la + rĂ©ponse originale. + </p> + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="h2pushdiarysize" id="h2pushdiarysize">Directive</a> <a name="H2PushDiarySize" id="H2PushDiarySize">H2PushDiarySize</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Taille du journal des Pushes H2</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2PushDiarySize n</code></td></tr> +<tr><th><a href="directive-dict.html#Default">DĂ©faut:</a></th><td><code>H2PushDiarySize 256</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">CompatibilitĂ©:</a></th><td>Disponible Ă partir de la version 2.4.19 du serveur HTTP + Apache.</td></tr> +</table> + <p> + Cette directive permet de dĂ©finir le nombre maximum de pushes + qui seront enregistrĂ©s pour une connexion HTTP/2. Elle peut ĂȘtre + placĂ©e dans une section <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code> afin de dĂ©finir le nombre + de pushes pour le serveur virtuel considĂ©rĂ©. + </p> + <p> + Le journal des pushes enregistre un condensĂ© (sous la forme d'un + nombre de 64 bits) des ressources prĂ©chargĂ©es (leurs URLs) afin + d'Ă©viter les duplications de pushes pour une mĂȘme connexion. + Cependant, ces donnĂ©es ne sont pas conservĂ©es, et les clients + qui ouvrent une nouvelle connexion se verront Ă nouveau affecter les + mĂȘmes pushes. A ce titre, une Ă©tude est en cours pour permettre + au client de supprimer le condensĂ© des ressources qu'il possĂšde + dĂ©jĂ , et par lĂ -mĂȘme de rĂ©initialiser le journal des pushes Ă + chaque nouvelle connexion. + </p> + <p> + Si la taille maximale est atteinte, les nouvelles entrĂ©es + remplacent les plus anciennes. Une entrĂ©e du journal nĂ©cessitant + 8 octets, un journal de 256 entrĂ©es consomme 2 Ko de mĂ©moire. + </p> + <p> + Si cette directive est dĂ©finie Ă 0, le journal des pushes est + dĂ©sactivĂ©. + </p> + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="h2pushpriority" id="h2pushpriority">Directive</a> <a name="H2PushPriority" id="H2PushPriority">H2PushPriority</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>PrioritĂ© des pushes H2</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2PushPriority mime-type [after|before|interleaved] [weight]</code></td></tr> +<tr><th><a href="directive-dict.html#Default">DĂ©faut:</a></th><td><code>H2PushPriority * After 16</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">CompatibilitĂ©:</a></th><td>Disponible Ă partir de la version 2.4.18 du serveur HTTP + Apache. NĂ©cessite la bibliothĂšque nghttp2 version 1.5.0 ou supĂ©rieure.</td></tr> +</table> + <p> + Cette directive permet de dĂ©finir une gestion de prioritĂ© des + pushes en fonction du type de contenu de la rĂ©ponse. Elle est en + gĂ©nĂ©ral dĂ©finie au niveau du serveur principal, mais peut aussi + l'ĂȘtre au niveau d'un serveur virtuel. + </p> + <p> + Les pushes HTTP/2 sont toujours liĂ©s Ă une requĂȘte client. + Chaque paire requĂȘte/rĂ©ponse de cette sorte, ou <em>flux</em>, + possĂšde une dĂ©pendance et un poids qui dĂ©finissent la + <em>prioritĂ©</em> du flux. + </p> + <p> + Lorsqu'un flux <em>dĂ©pend</em> d'un autre, disons X dĂ©pend de Y, + alors Y reçoit toute la bande passante avant que X n'en reçoive + ne serait-ce qu'une partie. Notez que cela ne signifie en rien + que Y bloque X ; en effet, si Y n'a aucune donnĂ©e Ă envoyer, + toute la bande passante qui lui est allouĂ©e peut ĂȘtre utilisĂ©e + par X. + </p> + <p> + Lorsque plusieurs flux dĂ©pendent d'un mĂȘme autre flux, disons X1 + et X2 dĂ©pendent tous deux de Y, le <em>poids</em> dĂ©termine la + bande passante allouĂ©e. Ainsi, si X1 et X2 possĂšdent le mĂȘme + poids, ils recevront tous deux la moitiĂ© de la bande passante + disponible. Si le poids de X1 est Ă©gal au double de celui de X2, + X1 recevra une bande passante double de celle de X2. + + </p> + <p> + En fin de compte, tout flux dĂ©pend du flux <em>racine</em> qui + reçoit toute la bande passante disponible mais n'envoie jamais + de donnĂ©es. Cette bande passante est ainsi rĂ©partie entre les flux + enfants selon leur poids. Ces derniers l'utilisent alors pour + envoyer leurs donnĂ©es ou pour la rĂ©partir entre leurs propres + flux enfants, et ainsi de suite. Si aucun des flux enfants n'a + de donnĂ©es Ă envoyer, la bande passante est attribuĂ©e Ă d'autres + flux selon les mĂȘmes rĂšgles. + </p> + <p> + Ce systĂšme de prioritĂ©s a Ă©tĂ© conçu de façon a toujours pouvoir + utiliser la bande passante disponible tout en dĂ©finissant des + prioritĂ©s et en attribuant des poids aux diffĂ©rents flux. Ainsi, + tous les flux sont en gĂ©nĂ©ral initialisĂ©s par le client qui + lui-mĂȘme dĂ©finit les prioritĂ©s. + </p> + <p> + Seul le fait de savoir qu'un flux implique un PUSH permet au + serveur de dĂ©cider quelle est la prioritĂ© <em>initiale</em> d'un + tel flux. Dans les exemples ci-dessous, X est le flux client. Il + dĂ©pend de Y et le serveur dĂ©cide de "PUSHer" les flux P1 et P2 + sur X. + </p> + <p> + La rĂšgle de prioritĂ© par dĂ©faut est : + </p> + <div class="example"><h3>RĂšgle de prioritĂ© par dĂ©faut</h3><pre class="prettyprint lang-config">H2PushPriority * After 16</pre> +</div> + <p> + Elle peut se traduire par "Envoyer un flux PUSH avec tout type + de contenu et dĂ©pendant du flux client avec le poids 16". P1 et + P2 seront alors envoyĂ©s aprĂšs X, et comme leurs poids sont + identiques, il se verront allouer la mĂȘme quantitĂ© de bande + passante. + </p> + <div class="example"><h3>RĂšgle de prioritĂ© entrelacĂ©e</h3><pre class="prettyprint lang-config">H2PushPriority text/css Interleaved 256</pre> +</div> + <p> + Ce qui peut se traduire par "Envoyer toute ressource CSS dans la + mĂȘme dĂ©pendance et avec le mĂȘme poids que le flux client". Si le + type de contenu de P1 est "text/css", il dĂ©pendra de Y (comme X) + et son poids effectif sera calculĂ© selon la formule : <code>P1ew + = Xw * (P1w / 256)</code>. Si P1w est de 256, Le poids effectif + de P1 sera le mĂȘme que celui de X. Si X et P1 ont des donnĂ©es Ă + envoyer, il se verront allouer la mĂȘme quantitĂ© de bande + passante. + </p> + <p> + Avec un Pw de 512, un flux entrelacĂ© et PUSHĂ© aura un poids + double de celui de X. Avec un poids de 128, son poids ne sera + que la moitiĂ© de celui de X. Notez que les poids effectifs sont + toujours plafonnĂ©s Ă 256. + + </p> + <div class="example"><h3>RĂšgle de prioritĂ© Before</h3><pre class="prettyprint lang-config">H2PushPriority application/json Before</pre> +</div> + <p> + Dans cet exemple, tout flux PUSHĂ© dont le contenu est de type + 'application/json' sera envoyĂ© <em>avant</em> X, ce qui rend P1 + dĂ©pendant de Y et X dĂ©pendant de P1. Ainsi, X sera mis en + attente aussi longtemps que P1 aura des donnĂ©es Ă envoyer. Le + poids effectif est hĂ©ritĂ© du flux client, et l'attribution d'un + poids spĂ©cifique n'est pas autorisĂ©e. + </p> + <p> + Vous devez garder Ă l'esprit que les spĂ©cifications en matiĂšre + de prioritĂ©s sont limitĂ©es par les ressources disponibles du + serveur. Si un serveur ne dispose d'aucun processus/thread de + travail pour les flux PUSHĂ©s, les donnĂ©es du flux considĂ©rĂ© ne + seront envoyĂ©es que lorsque les autres flux auront terminĂ© + l'envoi des leurs. + </p> + <p> + Enfin et surtout, il convient de tenir compte de certaines + particularitĂ©s de la syntaxe de cette directive : + </p> + <ol> + <li>'*' est la seule expression permettant de remplacer tout + type de contenu. 'image/*' ne fonctionnera pas.</li> + <li>La dĂ©pendance par dĂ©faut est 'After'.</li> + <li>Il existe aussi des poids par dĂ©faut : pour 'After' le poids + est de 16, alors que pour 'interleaved' il est de 256. + </li> + </ol> + <div class="example"><h3>Exemples de rĂšgles</h3><pre class="prettyprint lang-config">H2PushPriority application/json 32 # une rĂšgle de prioritĂ© 'After' +H2PushPriority image/jpeg before # poid hĂ©ritĂ© +H2PushPriority text/css interleaved # poids de 256 par dĂ©faut</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="h2pushresource" id="h2pushresource">Directive</a> <a name="H2PushResource" id="H2PushResource">H2PushResource</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>DĂ©clare des ressources Ă proposer ("pusher") au client</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2PushResource [add] path [critical]</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel, rĂ©pertoire, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">CompatibilitĂ©:</a></th><td>Disponible Ă partir de la version 2.4.24 du serveur HTTP + Apache.</td></tr> +</table> + <p> + Lorsqu'il sont activĂ©s pour un rĂ©pertoire, les PUSHes HTTP/2 seront + tentĂ©s pour tous les chemins ajoutĂ©s via cette directive. Cette + derniĂšre peut ĂȘtre utilisĂ©e plusieurs fois pour le mĂȘme + rĂ©pertoire. + </p> + <p> + Cette directive propose des ressources beaucoup plus tĂŽt que les + en-tĂȘtes <code>Link</code> de <code class="module"><a href="../mod/mod_headers.html">mod_headers</a></code>. + <code class="module"><a href="../mod/mod_http2.html">mod_http2</a></code> prĂ©sente ces ressources au client via + une rĂ©ponse intermĂ©diaire <code>103 Early Hints</code>. Ceci + implique que les clients qui ne supportent pas PUSH recevront + quand-mĂȘme rapidement des propositions de prĂ©chargement. + </p> + <p> + A la diffĂ©rence de la dĂ©finition d'en-tĂȘtes de rĂ©ponse + <code>Link</code> via <code class="module"><a href="../mod/mod_headers.html">mod_headers</a></code>, cette + directive n'aura d'effet que pour les connexions HTTP/2. + </p> + <p> + En ajoutant l'option <code>critical</code> Ă une telle + ressource, le serveur la traitera prioritairement, et une fois + les donnĂ©es disponibles, ces derniĂšres seront envoyĂ©es avant les + donnĂ©es de la requĂȘte principale. + </p> + +</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">Directive</a> <a name="H2SerializeHeaders" id="H2SerializeHeaders">H2SerializeHeaders</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Active/dĂ©sactive la sĂ©rialisation du traitement des + requĂȘtes/rĂ©ponses</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2SerializeHeaders on|off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">DĂ©faut:</a></th><td><code>H2SerializeHeaders off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +</table> + <p> + Cette directive permet de dĂ©finir si les requĂȘtes HTTP/2 doivent + ĂȘtre sĂ©rialisĂ©es au format HTTP/1.1 pour ĂȘtre traitĂ©es par le + noyau de <code>httpd</code>, ou si les donnĂ©es binaires reçues + doivent ĂȘtre passĂ©es directement aux <code>request_rec</code>s. + </p> + <p> + La sĂ©rialisation dĂ©grade les performances, mais garantit une + meilleure compatibilitĂ© ascendante lorsque des filtres ou + programmes accroche personnalisĂ©s en ont besoin. + </p> + <div class="example"><h3>Exemple</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="h2streammaxmemsize" id="h2streammaxmemsize">Directive</a> <a name="H2StreamMaxMemSize" id="H2StreamMaxMemSize">H2StreamMaxMemSize</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>QuantitĂ© maximale de donnĂ©es en sortie mises en tampon par + flux.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2StreamMaxMemSize <em>bytes</em></code></td></tr> +<tr><th><a href="directive-dict.html#Default">DĂ©faut:</a></th><td><code>H2StreamMaxMemSize 65536</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +</table> + <p> + Cette directive permet de dĂ©finir la quantitĂ© maximale de + donnĂ©es en sortie mises en tampon mĂ©moire pour un flux actif. Ce + tampon mĂ©moire n'est pas allouĂ© pour chaque flux en tant que + tel. Les quantitĂ©s de mĂ©moire sont dĂ©finies en fonction de + cette limite lorsqu'elles sont sur le point d'ĂȘtre allouĂ©es. Le + flux s'arrĂȘte lorsque la limite a Ă©tĂ© atteinte, et ne reprendra + que lorsque les donnĂ©es du tampon auront Ă©tĂ© transmises au + client. + </p> + <div class="example"><h3>Exemple</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="h2tlscooldownsecs" id="h2tlscooldownsecs">Directive</a> <a name="H2TLSCoolDownSecs" id="H2TLSCoolDownSecs">H2TLSCoolDownSecs</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td /></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2TLSCoolDownSecs <em>seconds</em></code></td></tr> +<tr><th><a href="directive-dict.html#Default">DĂ©faut:</a></th><td><code>H2TLSCoolDownSecs 1</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">CompatibilitĂ©:</a></th><td>Disponible Ă partir de la version 2.4.18 du serveur HTTP + Apache.</td></tr> +</table> + <p> + Cette directive permet de spĂ©cifier le nombre de secondes avant + lequel une connexion TLS inactive va diminuer + la taille des paquets de donnĂ©es Ă une valeur infĂ©rieure (~1300 + octets). Elle peut ĂȘtre dĂ©finie au niveau du serveur principal + ou pour un <code class="directive"><a href="../mod/core.html#serveur virtuel"><serveur + virtuel></a></code> spĂ©cifique. + </p> + <p> + Voir la directive <code class="directive"><a href="#h2tlswarmupsize">H2TLSWarmUpSize</a></code> pour une description + du "prĂ©chauffage" de TLS. La directive <code class="directive">H2TLSCoolDownSecs</code> met en + lumiĂšre le fait que les connexions peuvent se dĂ©tĂ©riorer au bout + d'un certain temps (et au fur et Ă mesure des corrections du + flux TCP), et cela mĂȘme si elle sont inactives. Pour ne pas + dĂ©tĂ©riorer les performances d'une maniĂšre gĂ©nĂ©rale, il est par + consĂ©quent prĂ©fĂ©rable de revenir Ă la phase de prĂ©chauffage + lorsqu'aucune donnĂ©e n'a Ă©tĂ© transmise pendant un certain nombre + de secondes. + </p> + <p> + Dans les situations oĂč les connexions peuvent ĂȘtre considĂ©rĂ©es + comme fiables, ce dĂ©lai peut ĂȘtre dĂ©sactivĂ© en dĂ©finissant cette + directive Ă 0. + </p> + <p> + Dans l'exemple suivant, la directive est dĂ©finie Ă 0, ce qui + dĂ©sactive tout retour Ă une phase de prĂ©chauffage des connexions + TLS. Les connexions TLS dĂ©jĂ prĂ©chauffĂ©es conservent donc toujours + leur taille de paquet de donnĂ©es maximale. + </p> + <div class="example"><h3>Exemple</h3><pre class="prettyprint lang-config">H2TLSCoolDownSecs 0</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="h2tlswarmupsize" id="h2tlswarmupsize">Directive</a> <a name="H2TLSWarmUpSize" id="H2TLSWarmUpSize">H2TLSWarmUpSize</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td /></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2TLSWarmUpSize <em>amount</em></code></td></tr> +<tr><th><a href="directive-dict.html#Default">DĂ©faut:</a></th><td><code>H2TLSWarmUpSize 1048576</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">CompatibilitĂ©:</a></th><td>Disponible Ă partir de la version 2.4.18 du serveur HTTP + Apache.</td></tr> +</table> + <p> + Cette directive permet de dĂ©finir le nombre d'octets Ă envoyer + dans les petits enregistrements TLS (~1300 octets) avant + d'atteindre leur taille maximale de 16 ko pour les connexions + https: HTTP/2. Elle peut ĂȘtre dĂ©finie au niveau du serveur + principal ou pour des <code class="directive"><a href="../mod/core.html#serveurs virtuels"><Serveurs virtuels></a></code> spĂ©cifiques. + </p> + <p> + Les mesures effectuĂ©es par les <a href="https://www.igvita.com">laboratoires de performances de + Google</a> montrent que les meilleurs performances sont atteintes + pour les connexions TLS si la taille initiale des + enregistrements reste en deça du niveau du MTU afin de permettre + Ă la totatlitĂ© d'un enregistrement d'entrer dans un paquet IP. + </p> + <p> + Comme TCP ajuste son contrĂŽle de flux et sa taille de fenĂȘtre, + des enregistrements TLS trop longs peuvent rester en file + d'attente ou mĂȘme ĂȘtre perdus et devoir alors ĂȘtre rĂ©Ă©mis. Ceci + est bien entendu vrai pour tous les paquets ; cependant, TLS a + besoin de la totalitĂ© de l'enregistrement pour pouvoir le + dĂ©chiffrer. Tout octet manquant rendra impossible l'utilisation + de ceux qui ont Ă©tĂ© reçus. + </p> + <p> + Lorqu'un nombre suffisant d'octets a Ă©tĂ© transmis avec succĂšs, + la connexion TCP est stable, et la taille maximale (16 ko) des + enregistrements TLS peut ĂȘtre utilisĂ©e pour des performances + optimales. + </p> + <p> + Dans les architectures oĂč les serveurs sont atteints par des + machines locales ou pour les connexions de confiance seulement, + la valeur de cette directive peut ĂȘtre dĂ©finie Ă 0, ce qui a + pour effet de dĂ©sactiver la "phase de chauffage". + </p> + <p> + Dans l'exemple suivant, la phase de chauffage est effectivement + dĂ©sactivĂ©e en dĂ©finissant la directive Ă 0. + </p> + <div class="example"><h3>Exemple</h3><pre class="prettyprint lang-config">H2TLSWarmUpSize 0</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="h2upgrade" id="h2upgrade">Directive</a> <a name="H2Upgrade" id="H2Upgrade">H2Upgrade</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Activation/DĂ©sactivation du protocole de mise Ă jour H2</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2Upgrade on|off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">DĂ©faut:</a></th><td><code>H2Upgrade on pour h2c, off pour h2</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +</table> + <p> + Cette directive permet d'activer/dĂ©sactiver l'utilisation de la + mĂ©thode de mise Ă jour pour passer de HTTP/1.1 Ă HTTP/2. Elle + doit ĂȘtre placĂ©e dans une section <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code> afin d'activer la mise Ă + jour vers HTTP/2 pour le serveur virtuel considĂ©rĂ©. + </p> + <p> + Cette mĂ©thode de changement de protocole est dĂ©finie dans + HTTP/1.1 et utilise l'en-tĂȘte "Upgrade" (d'oĂč son nom) pour + indiquer l'intention d'utiliser un autre protocole. Cet en-tĂȘte + peut ĂȘtre prĂ©sent dans toute requĂȘte sur une connexion HTTP/1.1. + </p> + <p> + Elle activĂ©e par dĂ©faut pour les transmissions en clair + (h2c), et dĂ©sactivĂ©e avec TLS (h2), comme prĂ©conisĂ© par la RFC + 7540. + </p> + <p> + Sachez cependant que les mises Ă jour ne sont acceptĂ©es que pour + les requĂȘtes qui ne possĂšdent pas de corps. Le requĂȘtes de type + POST et PUT avec un contenu ne feront jamais l'objet d'une mise + Ă jour vers HTTP/2. Se rĂ©fĂ©rer Ă la documentation de la + directive <code class="directive"><a href="#h2direct">H2Direct</a></code> pour + envisager une alternative Ă Upgrade. + </p> + <p> + Cette directive n'a d'effet que si h2 ou h2c est activĂ© via la + directive <code class="directive"><a href="../mod/core.html#protocols">Protocols</a></code>. + </p> + <div class="example"><h3>Exemple</h3><pre class="prettyprint lang-config">H2Upgrade 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="h2windowsize" id="h2windowsize">Directive</a> <a name="H2WindowSize" id="H2WindowSize">H2WindowSize</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Taille maximale des paquets de donnĂ©es pour les transmissions client + vers serveur.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>H2WindowSize <em>bytes</em></code></td></tr> +<tr><th><a href="directive-dict.html#Default">DĂ©faut:</a></th><td><code>H2WindowSize 65535</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_http2</td></tr> +</table> + <p> + Cette directive permet de dĂ©finir la taille maximale des paquets + de donnĂ©es envoyĂ©s par le client au serveur, et + limite la quantitĂ© de donnĂ©es que le serveur doit mettre en + tampon. Le client arrĂȘtera d'envoyer des donnĂ©es sur un flux + lorsque cette limite sera atteinte jusqu'Ă ce que le serveur + indique qu'il dispose d'un espace suffisant (car il aura traitĂ© + une partie des donnĂ©es). + </p><p> + Cette limite n'affecte que les corps de requĂȘtes, non les + mĂ©tadonnĂ©es comme les en-tĂȘtes. Par contre, elle n'affecte pas + les corps de rĂ©ponses car la taille maximale de ces derniers est + gĂ©rĂ©e au niveau des clients. + </p> + <div class="example"><h3>Exemple</h3><pre class="prettyprint lang-config">H2WindowSize 128000</pre> +</div> + +</div> +</div> +<div class="bottomlang"> +<p><span>Langues Disponibles: </span><a href="../en/mod/mod_http2.html" hreflang="en" rel="alternate" title="English"> en </a> | +<a href="../fr/mod/mod_http2.html" title="Français"> fr </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">Commentaires</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> +<script type="text/javascript"><!--//--><![CDATA[//><!-- +var comments_shortname = 'httpd'; +var comments_identifier = 'http://httpd.apache.org/docs/2.4/mod/mod_http2.html'; +(function(w, d) { + if (w.location.hostname.toLowerCase() == "httpd.apache.org") { + d.write('<div id="comments_thread"><\/div>'); + var s = d.createElement('script'); + s.type = 'text/javascript'; + s.async = true; + s.src = 'https://comments.apache.org/show_comments.lua?site=' + comments_shortname + '&page=' + comments_identifier; + (d.getElementsByTagName('head')[0] || d.getElementsByTagName('body')[0]).appendChild(s); + } + else { + d.write('<div id="comments_thread">Comments are disabled for this page at the moment.<\/div>'); + } +})(window, document); +//--><!]]></script></div><div id="footer"> +<p class="apache">Copyright 2019 The Apache Software Foundation.<br />AutorisĂ© sous <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p> +<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">Glossaire</a> | <a href="../sitemap.html">Plan du site</a></p></div><script type="text/javascript"><!--//--><![CDATA[//><!-- +if (typeof(prettyPrint) !== 'undefined') { + prettyPrint(); +} +//--><!]]></script> +</body></html>
\ No newline at end of file |