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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
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This file is generated from xml source: DO NOT EDIT
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<title>mod_setenvif - Apache HTTP Server Version 2.5</title>
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<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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<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" />
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<script src="../style/scripts/prettify.min.js" type="text/javascript">
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</script>
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<link href="../images/favicon.png" rel="shortcut icon" /></head>
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<body>
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<div id="page-header">
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/quickreference.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>
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<p class="apache">Apache HTTP Server Version 2.5</p>
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<img alt="" src="../images/feather.png" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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<div id="path">
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.5</a> > <a href="./">Modules</a></div>
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<div id="page-content">
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<div id="preamble"><h1>Apache Module mod_setenvif</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_setenvif.html" title="English"> en </a> |
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<a href="../fr/mod/mod_setenvif.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
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<a href="../ja/mod/mod_setenvif.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
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<a href="../ko/mod/mod_setenvif.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
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<a href="../tr/mod/mod_setenvif.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
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</div>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Allows the setting of environment variables based
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on characteristics of the request</td></tr>
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<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Base</td></tr>
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<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>setenvif_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_setenvif.c</td></tr></table>
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<h3>Summary</h3>
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<p>The <code class="module"><a href="../mod/mod_setenvif.html">mod_setenvif</a></code> module allows you to set
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internal environment variables according to whether different aspects of
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the request match regular expressions you specify. These
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environment variables can be used by other parts of the server
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to make decisions about actions to be taken, as well as becoming
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available to CGI scripts and SSI pages.</p>
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<p>The directives are considered in the order they appear in
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the configuration files. So more complex sequences can be used,
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such as this example, which sets <code>netscape</code> if the
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browser is mozilla but not MSIE.</p>
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<pre class="prettyprint lang-config">BrowserMatch ^Mozilla netscape
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BrowserMatch MSIE !netscape</pre>
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<p>When the server looks up a path via an internal
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<a class="glossarylink" href="../glossary.html#subrequest" title="see glossary">subrequest</a> such as looking
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for a <code class="directive"><a href="../mod/mod_dir.html#directoryindex">DirectoryIndex</a></code>
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or generating a directory listing with <code class="module"><a href="../mod/mod_autoindex.html">mod_autoindex</a></code>,
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per-request environment variables are <em>not</em> inherited in the
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subrequest. Additionally,
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<code class="directive"><a href="#setenvif">SetEnvIf</a></code> directives
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are not separately evaluated in the subrequest due to the API phases
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<code class="module"><a href="../mod/mod_setenvif.html">mod_setenvif</a></code> takes action in.</p>
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<p>A regular expression only needs quoting when it contains space,
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in which case single and double quotes are equivalent. Unlike
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<code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code>, <code class="module"><a href="../mod/mod_setenvif.html">mod_setenvif</a></code> strips every
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other backslash when parsing the expression; thus <code>\\</code>
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requires <code>\\\</code>, and <code>\\\</code> requires
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<code>\\\\\</code>.</p>
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</div>
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<div id="quickview"><h3 class="directives">Directives</h3>
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||
<ul id="toc">
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<li><img alt="" src="../images/down.gif" /> <a href="#browsermatch">BrowserMatch</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#browsermatchnocase">BrowserMatchNoCase</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#setenvif">SetEnvIf</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#setenvifexpr">SetEnvIfExpr</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#setenvifnocase">SetEnvIfNoCase</a></li>
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</ul>
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<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_setenvif">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_setenvif">Report a bug</a></li></ul><h3>See also</h3>
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<ul class="seealso">
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<li><a href="../env.html">Environment Variables in Apache HTTP Server</a></li>
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<li><a href="#comments_section">Comments</a></li></ul></div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="BrowserMatch" id="BrowserMatch">BrowserMatch</a> <a name="browsermatch" id="browsermatch">Directive</a> <a title="Permanent link" href="#browsermatch" class="permalink">¶</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets environment variables conditional on HTTP User-Agent
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</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>BrowserMatch <em>regex [!]env-variable</em>[=<em>value</em>]
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[[!]<em>env-variable</em>[=<em>value</em>]] ...</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
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<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_setenvif</td></tr>
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</table>
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<p>The <code class="directive">BrowserMatch</code> is a special cases of the
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<code class="directive"><a href="#setenvif">SetEnvIf</a></code> directive that
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sets environment variables conditional on the
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<code>User-Agent</code> HTTP request header. The following two
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lines have the same effect:</p>
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<pre class="prettyprint lang-config">BrowserMatch Robot is_a_robot
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SetEnvIf User-Agent Robot is_a_robot</pre>
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<p>Some additional examples:</p>
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<pre class="prettyprint lang-config">BrowserMatch ^Mozilla forms jpeg=yes browser=netscape
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BrowserMatch "^Mozilla/[2-3]" tables agif frames javascript
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BrowserMatch MSIE !javascript</pre>
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</div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="BrowserMatchNoCase" id="BrowserMatchNoCase">BrowserMatchNoCase</a> <a name="browsermatchnocase" id="browsermatchnocase">Directive</a> <a title="Permanent link" href="#browsermatchnocase" class="permalink">¶</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets environment variables conditional on User-Agent without
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respect to case</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>BrowserMatchNoCase <em>regex [!]env-variable</em>[=<em>value</em>]
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[[!]<em>env-variable</em>[=<em>value</em>]] ...</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
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<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_setenvif</td></tr>
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||
</table>
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<p>The <code class="directive">BrowserMatchNoCase</code> directive is
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||
semantically identical to the <code class="directive"><a href="#browsermatch">BrowserMatch</a></code> directive.
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However, it provides for case-insensitive matching. For
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example:</p>
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<pre class="prettyprint lang-config">BrowserMatchNoCase mac platform=macintosh
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BrowserMatchNoCase win platform=windows</pre>
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<p>The <code class="directive">BrowserMatch</code> and
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<code class="directive">BrowserMatchNoCase</code> directives are special cases of
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the <code class="directive"><a href="#setenvif">SetEnvIf</a></code> and <code class="directive"><a href="#setenvifnocase">SetEnvIfNoCase</a></code>
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directives. The following two lines have the same effect:</p>
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<pre class="prettyprint lang-config">BrowserMatchNoCase Robot is_a_robot
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SetEnvIfNoCase User-Agent Robot is_a_robot</pre>
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</div>
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||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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||
<div class="directive-section"><h2><a name="SetEnvIf" id="SetEnvIf">SetEnvIf</a> <a name="setenvif" id="setenvif">Directive</a> <a title="Permanent link" href="#setenvif" class="permalink">¶</a></h2>
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||
<table class="directive">
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||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets environment variables based on attributes of the request
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</td></tr>
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||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SetEnvIf <em>attribute
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regex [!]env-variable</em>[=<em>value</em>]
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[[!]<em>env-variable</em>[=<em>value</em>]] ...</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
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||
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
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||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_setenvif</td></tr>
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||
</table>
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||
<p>The <code class="directive">SetEnvIf</code> directive defines
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environment variables based on attributes of the request. The
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<em>attribute</em> specified in the first argument can be one of the
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||
following things:</p>
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||
|
||
<ol>
|
||
<li>An HTTP request header field (see <a href="http://www.rfc-editor.org/rfc/rfc2616.txt">RFC2616</a>
|
||
for more information about these); for example: <code>Host</code>,
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||
<code>User-Agent</code>, <code>Referer</code>, and
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||
<code>Accept-Language</code>. A regular expression may be
|
||
used to specify a set of request headers.</li>
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||
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||
<li>One of the following aspects of the request:
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||
<ul>
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||
<li><code>Remote_Host</code> - the hostname (if available) of
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||
the client making the request</li>
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||
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||
<li><code>Remote_Addr</code> - the IP address of the client
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||
making the request</li>
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||
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||
<li><code>Server_Addr</code> - the IP address of the server
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||
on which the request was received (only with versions later
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||
than 2.0.43)</li>
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||
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||
<li><code>Request_Method</code> - the name of the method
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||
being used (<code>GET</code>, <code>POST</code>, <em>et
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||
cetera</em>)</li>
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||
|
||
<li><code>Request_Protocol</code> - the name and version of
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||
the protocol with which the request was made (<em>e.g.</em>,
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||
"HTTP/0.9", "HTTP/1.1", <em>etc.</em>)</li>
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<li><code>Request_URI</code> - the resource requested on the HTTP
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||
request line -- generally the portion of the URL
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||
following the scheme and host portion without the query string. See
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the <code class="directive"><a href="../mod/mod_rewrite.html#rewritecond">RewriteCond</a></code>
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||
directive of <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> for extra information on
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how to match your query string.</li>
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</ul>
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</li>
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<li>The name of an environment variable in the list of those
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associated with the request. This allows
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<code class="directive">SetEnvIf</code> directives to test against the result
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of prior matches. Only those environment variables defined by earlier
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<code>SetEnvIf[NoCase]</code> directives are available for testing in
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this manner. 'Earlier' means that they were defined at a broader scope
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(such as server-wide) or previously in the current directive's scope.
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Environment variables will be considered only if there was no match
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among request characteristics and a regular expression was not
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used for the <em>attribute</em>.</li>
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</ol>
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<p>The second argument (<em>regex</em>) is a <a class="glossarylink" href="../glossary.html#regex" title="see glossary">regular expression</a>. If the <em>regex</em>
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matches against the <em>attribute</em>, then the remainder of the
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||
arguments are evaluated.</p>
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<p>The rest of the arguments give the names of variables to set, and
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optionally values to which they should be set. These take the form
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of</p>
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||
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<ol>
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<li><code><em>varname</em></code>, or</li>
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<li><code>!<em>varname</em></code>, or</li>
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<li><code><em>varname</em>=<em>value</em></code></li>
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||
</ol>
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<p>In the first form, the value will be set to "1". The second
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will remove the given variable if already defined, and the
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third will set the variable to the literal value given by
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<code><em>value</em></code>. Since version 2.0.51, Apache httpd will
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||
recognize occurrences of <code>$1</code>..<code>$9</code> within
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<var>value</var> and replace them by parenthesized subexpressions
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of <var>regex</var>. <code>$0</code> provides access to the whole
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||
string matched by that pattern.</p>
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||
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<p>If the special value <code>--early</code> is specified, and this
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||
directive is not in directory context, the directive will be evaluated
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earlier during request processing. This allows the output variables
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||
set by this directive to be used as input to the "early mode" option of
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||
the <code class="directive"><a href="../mod/mod_headers.html#requestheader">RequestHeader</a></code> directive.
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Available in 2.5.1 and later.</p>
|
||
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<pre class="prettyprint lang-config">SetEnvIf Request_URI "\.gif$" object_is_image=gif
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SetEnvIf Request_URI "\.jpg$" object_is_image=jpg
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SetEnvIf Request_URI "\.xbm$" object_is_image=xbm
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||
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SetEnvIf Referer www\.mydomain\.example\.com intra_site_referral
|
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SetEnvIf object_is_image xbm XBIT_PROCESSING=1
|
||
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SetEnvIf Request_URI "\.(.*)$" EXTENSION=$1
|
||
|
||
SetEnvIf ^TS ^[a-z] HAVE_TS</pre>
|
||
|
||
|
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<p>The first three will set the environment variable
|
||
<code>object_is_image</code> if the request was for an image
|
||
file, and the fourth sets <code>intra_site_referral</code> if
|
||
the referring page was somewhere on the
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||
<code>www.mydomain.example.com</code> Web site.</p>
|
||
|
||
<p>The last example will set environment variable
|
||
<code>HAVE_TS</code> if the request contains any headers that
|
||
begin with "TS" whose values begins with any character in the
|
||
set [a-z].</p>
|
||
|
||
<h3>See also</h3>
|
||
<ul>
|
||
<li><a href="../env.html">Environment Variables in Apache HTTP Server</a>,
|
||
for additional examples.
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
||
<div class="directive-section"><h2><a name="SetEnvIfExpr" id="SetEnvIfExpr">SetEnvIfExpr</a> <a name="setenvifexpr" id="setenvifexpr">Directive</a> <a title="Permanent link" href="#setenvifexpr" class="permalink">¶</a></h2>
|
||
<table class="directive">
|
||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets environment variables based on an ap_expr expression</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SetEnvIfExpr <em>expr
|
||
[!]env-variable</em>[=<em>value</em>]
|
||
[[!]<em>env-variable</em>[=<em>value</em>]] ...</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
|
||
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_setenvif</td></tr>
|
||
</table>
|
||
<p>The <code class="directive">SetEnvIfExpr</code> directive defines
|
||
environment variables based on an <a href="../expr.html">expression</a>.
|
||
These expressions will be evaluated at runtime,
|
||
and applied <em>env-variable</em> in the same fashion as <code class="directive">SetEnvIf</code>, including backreferences.</p>
|
||
|
||
<pre class="prettyprint lang-config"> SetEnvIfExpr "tolower(req('X-Sendfile')) == 'd:\images\very_big.iso')" iso_delivered
|
||
SetEnvIfExpr "tolower(req('X-Sendfile')) =~ /(.*\.iso$)/" iso-path=$1</pre>
|
||
|
||
|
||
<p>This would set the environment variable <code>iso_delivered</code>
|
||
every time our application attempts to send it via <code>X-Sendfile</code></p>
|
||
|
||
<p>A more useful example would be to set the variable rfc1918 if the
|
||
remote IP address is a private address according to RFC 1918:</p>
|
||
|
||
<pre class="prettyprint lang-config">SetEnvIfExpr "-R '10.0.0.0/8' || -R '172.16.0.0/12' || -R '192.168.0.0/16'" rfc1918</pre>
|
||
|
||
|
||
<h3>See also</h3>
|
||
<ul>
|
||
<li><a href="../expr.html">Expressions in Apache HTTP Server</a>,
|
||
for a complete reference and more examples.</li>
|
||
<li><code class="directive"><a href="../mod/core.html#if"><If></a></code> can be used to achieve similar
|
||
results.</li>
|
||
<li><code class="module"><a href="../mod/mod_filter.html">mod_filter</a></code></li>
|
||
</ul>
|
||
</div>
|
||
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="SetEnvIfNoCase" id="SetEnvIfNoCase">SetEnvIfNoCase</a> <a name="setenvifnocase" id="setenvifnocase">Directive</a> <a title="Permanent link" href="#setenvifnocase" class="permalink">¶</a></h2>
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<table class="directive">
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||
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets environment variables based on attributes of the request
|
||
without respect to case</td></tr>
|
||
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SetEnvIfNoCase <em>attribute regex
|
||
[!]env-variable</em>[=<em>value</em>]
|
||
[[!]<em>env-variable</em>[=<em>value</em>]] ...</code></td></tr>
|
||
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
|
||
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
|
||
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
|
||
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_setenvif</td></tr>
|
||
</table>
|
||
|
||
<p>The <code class="directive">SetEnvIfNoCase</code> is semantically identical to
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||
the <code class="directive"><a href="#setenvif">SetEnvIf</a></code> directive,
|
||
and differs only in that the regular expression matching is
|
||
performed in a case-insensitive manner. For example:</p>
|
||
<pre class="prettyprint lang-config">SetEnvIfNoCase Host Example\.Org site=example</pre>
|
||
|
||
|
||
<p>This will cause the <code>site</code> environment variable
|
||
to be set to "<code>example</code>" if the HTTP request header
|
||
field <code>Host:</code> was included and contained
|
||
<code>Example.Org</code>, <code>example.org</code>, or any other
|
||
combination.</p>
|
||
|
||
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