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|  | <p class="apache">Apache HTTP Server Version 2.5</p> | 
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|  | <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"> en </a> | | 
|  | <a href="../fr/mod/mod_setenvif.html" hreflang="fr" rel="alternate" title="Français"> fr </a> | | 
|  | <a href="../ja/mod/mod_setenvif.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | | 
|  | <a href="../ko/mod/mod_setenvif.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> | | 
|  | <a href="../tr/mod/mod_setenvif.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </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 | 
|  | internal 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, as well as becoming | 
|  | available to CGI scripts and SSI pages.</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> | 
|  |  | 
|  | <pre class="prettyprint lang-config">BrowserMatch ^Mozilla netscape | 
|  | BrowserMatch MSIE !netscape</pre> | 
|  |  | 
|  |  | 
|  | <p>When the server looks up a path via an internal | 
|  | <a class="glossarylink" href="../glossary.html#subrequest" title="see glossary">subrequest</a> such as looking | 
|  | for a <code class="directive"><a href="../mod/mod_dir.html#directoryindex">DirectoryIndex</a></code> | 
|  | or generating a directory listing with <code class="module"><a href="../mod/mod_autoindex.html">mod_autoindex</a></code>, | 
|  | per-request environment variables are <em>not</em> inherited in the | 
|  | subrequest. Additionally, | 
|  | <code class="directive"><a href="#setenvif">SetEnvIf</a></code> directives | 
|  | are not separately evaluated in the subrequest due to the API phases | 
|  | <code class="module"><a href="../mod/mod_setenvif.html">mod_setenvif</a></code> takes action in.</p> | 
|  |  | 
|  | <p>A regular expression only needs quoting when it contains space, | 
|  | in which case single and double quotes are equivalent. Unlike | 
|  | <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 | 
|  | other backslash when parsing the expression; thus <code>\\</code> | 
|  | requires <code>\\\</code>, and <code>\\\</code> requires | 
|  | <code>\\\\\</code>.</p> | 
|  |  | 
|  | </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="#setenvifexpr">SetEnvIfExpr</a></li> | 
|  | <li><img alt="" src="../images/down.gif" /> <a href="#setenvifnocase">SetEnvIfNoCase</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_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> | 
|  | <ul class="seealso"> | 
|  | <li><a href="../env.html">Environment Variables in Apache HTTP Server</a></li> | 
|  | <li><a href="#comments_section">Comments</a></li></ul></div> | 
|  |  | 
|  | <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> | 
|  | <div class="directive-section"><h2><a name="BrowserMatch" id="BrowserMatch">BrowserMatch</a> <a name="browsermatch" id="browsermatch">Directive</a> <a title="Permanent link" href="#browsermatch" class="permalink">¶</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> | 
|  | <pre class="prettyprint lang-config">BrowserMatch Robot is_a_robot | 
|  | SetEnvIf User-Agent Robot is_a_robot</pre> | 
|  |  | 
|  |  | 
|  | <p>Some additional examples:</p> | 
|  | <pre class="prettyprint lang-config">BrowserMatch ^Mozilla forms jpeg=yes browser=netscape | 
|  | BrowserMatch "^Mozilla/[2-3]" tables agif frames javascript | 
|  | BrowserMatch MSIE !javascript</pre> | 
|  |  | 
|  |  | 
|  | </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> <a title="Permanent link" href="#browsermatchnocase" class="permalink">¶</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> | 
|  | </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> | 
|  | <pre class="prettyprint lang-config">BrowserMatchNoCase mac platform=macintosh | 
|  | BrowserMatchNoCase win platform=windows</pre> | 
|  |  | 
|  |  | 
|  | <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> | 
|  | <pre class="prettyprint lang-config">BrowserMatchNoCase Robot is_a_robot | 
|  | SetEnvIfNoCase User-Agent Robot is_a_robot</pre> | 
|  |  | 
|  |  | 
|  | </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> <a title="Permanent link" href="#setenvif" class="permalink">¶</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 the | 
|  | following 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 class="glossarylink" href="../glossary.html#regex" title="see glossary">regular expression</a>.  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 httpd will | 
|  | recognize occurrences of <code>$1</code>..<code>$9</code> within | 
|  | <var>value</var> and replace them by parenthesized subexpressions | 
|  | of <var>regex</var>. <code>$0</code> provides access to the whole | 
|  | string matched by that pattern.</p> | 
|  |  | 
|  | <p>If the special value <code>--early</code> is specified, and this | 
|  | directive is not in directory context, the directive will be evaluated | 
|  | earlier during request processing.  This allows the output variables | 
|  | set by this directive to be used as input to the "early mode" option of | 
|  | the <code class="directive"><a href="../mod/mod_headers.html#requestheader">RequestHeader</a></code> directive. | 
|  | Available in 2.5.1 and later.</p> | 
|  |  | 
|  | <pre class="prettyprint lang-config">SetEnvIf Request_URI "\.gif$" object_is_image=gif | 
|  | SetEnvIf Request_URI "\.jpg$" object_is_image=jpg | 
|  | SetEnvIf Request_URI "\.xbm$" object_is_image=xbm | 
|  |  | 
|  | SetEnvIf Referer www\.mydomain\.example\.com intra_site_referral | 
|  |  | 
|  | SetEnvIf object_is_image xbm XBIT_PROCESSING=1 | 
|  |  | 
|  | SetEnvIf Request_URI "\.(.*)$" EXTENSION=$1 | 
|  |  | 
|  | SetEnvIf ^TS  ^[a-z]  HAVE_TS</pre> | 
|  |  | 
|  |  | 
|  | <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.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> | 
|  | <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> | 
|  | <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> | 
|  | </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> | 
|  | <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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