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-<title>mod_setenvif - Apache HTTP Server</title>
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-<p class="apache">Apache HTTP Server Version 2.0</p>
-<img alt="" src="../images/feather.gif" /></div>
-<div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="../images/left.gif" /></a></div>
-<div id="path">
-<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.0</a> &gt; <a href="./">Modules</a></div>
-<div id="page-content">
-<div id="preamble"><h1>Apache Module mod_setenvif</h1>
-<div class="toplang">
-<p><span>Available Languages: </span><a href="../en/mod/mod_setenvif.html" title="English">&nbsp;en&nbsp;</a> |
-<a href="../ja/mod/mod_setenvif.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
-<a href="../ko/mod/mod_setenvif.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a> |
-<a href="../tr/mod/mod_setenvif.html" hreflang="tr" rel="alternate" title="Türkçe">&nbsp;tr&nbsp;</a></p>
-</div>
-<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Allows the setting of environment variables based
-on characteristics of the request</td></tr>
-<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Base</td></tr>
-<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>setenvif_module</td></tr>
-<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_setenvif.c</td></tr></table>
-<h3>Summary</h3>
-
-
- <p>The <code class="module"><a href="../mod/mod_setenvif.html">mod_setenvif</a></code> module allows you to set
- environment variables according to whether different aspects of
- the request match regular expressions you specify. These
- environment variables can be used by other parts of the server
- to make decisions about actions to be taken.</p>
-
- <p>The directives are considered in the order they appear in
- the configuration files. So more complex sequences can be used,
- such as this example, which sets <code>netscape</code> if the
- browser is mozilla but not MSIE.</p>
-
-<div class="example"><p><code>
- BrowserMatch ^Mozilla netscape<br />
- BrowserMatch MSIE !netscape<br />
-</code></p></div>
-</div>
-<div id="quickview"><h3 class="directives">Directives</h3>
-<ul id="toc">
-<li><img alt="" src="../images/down.gif" /> <a href="#browsermatch">BrowserMatch</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#browsermatchnocase">BrowserMatchNoCase</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#setenvif">SetEnvIf</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#setenvifnocase">SetEnvIfNoCase</a></li>
-</ul>
-<h3>See also</h3>
-<ul class="seealso">
-<li><a href="../env.html">Environment Variables in Apache</a></li>
-</ul></div>
-
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="BrowserMatch" id="BrowserMatch">BrowserMatch</a> <a name="browsermatch" id="browsermatch">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets environment variables conditional on HTTP User-Agent
-</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>BrowserMatch <em>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">BrowserMatch</code> is a special cases of the
- <code class="directive"><a href="#setenvif">SetEnvIf</a></code> directive that
- sets environment variables conditional on the
- <code>User-Agent</code> HTTP request header. The following two
- lines have the same effect:</p>
-<div class="example"><p><code>
- BrowserMatchNoCase Robot is_a_robot<br />
- SetEnvIfNoCase User-Agent Robot is_a_robot<br />
-</code></p></div>
-
- <p>Some additional examples:</p>
-<div class="example"><p><code>
- BrowserMatch ^Mozilla forms jpeg=yes browser=netscape<br />
- BrowserMatch "^Mozilla/[2-3]" tables agif frames javascript<br />
- BrowserMatch MSIE !javascript<br />
-</code></p></div>
-
-</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="BrowserMatchNoCase" id="BrowserMatchNoCase">BrowserMatchNoCase</a> <a name="browsermatchnocase" id="browsermatchnocase">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets environment variables conditional on User-Agent without
-respect to case</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>BrowserMatchNoCase <em>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>
-<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Apache 1.2 and
- above (in Apache 1.2 this directive was found in the
- now-obsolete mod_browser module)</td></tr>
-</table>
-
- <p>The <code class="directive">BrowserMatchNoCase</code> directive is
- semantically identical to the <code class="directive"><a href="#browsermatch">BrowserMatch</a></code> directive.
- However, it provides for case-insensitive matching. For
- example:</p>
-<div class="example"><p><code>
- BrowserMatchNoCase mac platform=macintosh<br />
- BrowserMatchNoCase win platform=windows<br />
-</code></p></div>
-
- <p>The <code class="directive">BrowserMatch</code> and
- <code class="directive">BrowserMatchNoCase</code> directives are special cases of
- the <code class="directive"><a href="#setenvif">SetEnvIf</a></code> and <code class="directive"><a href="#setenvifnocase">SetEnvIfNoCase</a></code>
- directives. The following two lines have the same effect:</p>
-<div class="example"><p><code>
- BrowserMatchNoCase Robot is_a_robot<br />
- SetEnvIfNoCase User-Agent Robot is_a_robot<br />
-</code></p></div>
-
-</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="SetEnvIf" id="SetEnvIf">SetEnvIf</a> <a name="setenvif" id="setenvif">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets environment variables based on attributes of the request
-</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SetEnvIf <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">SetEnvIf</code> directive defines
- environment variables based on attributes of the request. The
- <em>attribute</em> specified in the first argument can be one of three
- things:</p>
-
-<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>,
- <code>User-Agent</code>, <code>Referer</code>, and
- <code>Accept-Language</code>. A regular expression may be
- used to specify a set of request headers.</li>
-
-<li>One of the following aspects of the request:
- <ul>
- <li><code>Remote_Host</code> - the hostname (if available) of
- the client making the request</li>
-
- <li><code>Remote_Addr</code> - the IP address of the client
- making the request</li>
-
- <li><code>Server_Addr</code> - the IP address of the server
- on which the request was received (only with versions later
- than 2.0.43)</li>
-
- <li><code>Request_Method</code> - the name of the method
- being used (<code>GET</code>, <code>POST</code>, <em>et
- cetera</em>)</li>
-
- <li><code>Request_Protocol</code> - the name and version of
- the protocol with which the request was made (<em>e.g.</em>,
- "HTTP/0.9", "HTTP/1.1", <em>etc.</em>)</li>
-
- <li><code>Request_URI</code> - the resource requested on the HTTP
- request line -- generally the portion of the URL
- following the scheme and host portion without the query string. See
- the <code class="directive"><a href="../mod/mod_rewrite.html#rewritecond">RewriteCond</a></code>
- directive of <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> for extra information on
- how to match your query string.</li>
- </ul>
-</li>
-
-<li>The name of an environment variable in the list of those
-associated with the request. This allows
-<code class="directive">SetEnvIf</code> directives to test against the result
-of prior matches. Only those environment variables defined by earlier
-<code>SetEnvIf[NoCase]</code> directives are available for testing in
-this manner. 'Earlier' means that they were defined at a broader scope
-(such as server-wide) or previously in the current directive's scope.
-Environment variables will be considered only if there was no match
-among request characteristics and a regular expression was not
-used for the <em>attribute</em>.</li>
-</ol>
-
-<p>The second argument (<em>regex</em>) is a <a href="http://www.pcre.org/">Perl compatible regular expression</a>.
-This is similar to a POSIX.2 egrep-style regular expression.
-If the <em>regex</em> matches against the <em>attribute</em>,
-then the remainder of the arguments are evaluated.</p>
-
-<p>The rest of the arguments give the names of variables to set, and
-optionally values to which they should be set. These take the form
-of</p>
-
- <ol>
- <li><code><em>varname</em></code>, or</li>
-
- <li><code>!<em>varname</em></code>, or</li>
-
- <li><code><em>varname</em>=<em>value</em></code></li>
- </ol>
-
- <p>In the first form, the value will be set to "1". The second
- will remove the given variable if already defined, and the
- third will set the variable to the literal value given by
- <code><em>value</em></code>. Since version 2.0.51 Apache will
- recognize occurrences of <code>$1</code>..<code>$9</code> within
- <var>value</var> and replace them by parenthesized subexpressions
- of <var>regex</var>.</p>
-
-<div class="example"><h3>Example:</h3><p><code>
-
- SetEnvIf Request_URI "\.gif$" object_is_image=gif<br />
- SetEnvIf Request_URI "\.jpg$" object_is_image=jpg<br />
- SetEnvIf Request_URI "\.xbm$" object_is_image=xbm<br />
- :<br />
- SetEnvIf Referer www\.mydomain\.com intra_site_referral<br />
- :<br />
- SetEnvIf object_is_image xbm XBIT_PROCESSING=1<br />
- :<br />
- SetEnvIf ^TS* ^[a-z].* HAVE_TS<br />
-</code></p></div>
-
- <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
- <code>www.mydomain.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</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="SetEnvIfNoCase" id="SetEnvIfNoCase">SetEnvIfNoCase</a> <a name="setenvifnocase" id="setenvifnocase">Directive</a></h2>
-<table class="directive">
-<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>
-<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Apache 1.3 and above</td></tr>
-</table>
-
- <p>The <code class="directive">SetEnvIfNoCase</code> is semantically identical to
- 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>
-<div class="example"><p><code>
- SetEnvIfNoCase Host Apache\.Org site=apache
-</code></p></div>
-
- <p>This will cause the <code>site</code> environment variable
- to be set to "<code>apache</code>" if the HTTP request header
- field <code>Host:</code> was included and contained
- <code>Apache.Org</code>, <code>apache.org</code>, or any other
- combination.</p>
-
-</div>
-</div>
-<div class="bottomlang">
-<p><span>Available Languages: </span><a href="../en/mod/mod_setenvif.html" title="English">&nbsp;en&nbsp;</a> |
-<a href="../ja/mod/mod_setenvif.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
-<a href="../ko/mod/mod_setenvif.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a> |
-<a href="../tr/mod/mod_setenvif.html" hreflang="tr" rel="alternate" title="Türkçe">&nbsp;tr&nbsp;</a></p>
-</div><div id="footer">
-<p class="apache">Copyright 2009 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="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div>
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