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435 lines
12 KiB
HTML
435 lines
12 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<TITLE>Apache module mod_setenvif</TITLE>
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<!--#include virtual="header.html" -->
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<H1 ALIGN="CENTER">Module mod_setenvif</H1>
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<P>
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This module provides the ability to set environment variables based
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upon attributes of the request.
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</P>
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<P><A
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HREF="module-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base
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<BR>
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<A
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HREF="module-dict.html#SourceFile"
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REL="Help"
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><STRONG>Source File:</STRONG></A> mod_setenvif.c
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<BR>
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<A
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HREF="module-dict.html#ModuleIdentifier"
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REL="Help"
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><STRONG>Module Identifier:</STRONG></A> setenvif_module
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<BR>
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<A
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HREF="module-dict.html#Compatibility"
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REL="Help"
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><STRONG>Compatibility:</STRONG></A> Available in Apache 1.3 and later.
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</P>
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<H2>Summary</H2>
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<P>
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The <SAMP>mod_setenvif</SAMP> module allows you to set environment
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variables according to whether different aspects of the request match
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<a href="../misc/FAQ.html#regex">regular expressions</a>
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you specify. These environment variables can be used by
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other parts of the server to make decisions about actions to be taken.
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</P>
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<P>The directives are considered in the order they appear in the
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configuration files. So more complex sequences can be used, such
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as this example, which sets <CODE>netscape</CODE> if the browser
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is mozilla but not MSIE.
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<BLOCKQUOTE><PRE>
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BrowserMatch ^Mozilla netscape
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BrowserMatch MSIE !netscape
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</PRE></BLOCKQUOTE>
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</P>
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<p>For additional information, we provide a document on
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<a href="../env.html">Environment Variables in Apache</a>.</p>
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<H2>Directives</H2>
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<UL>
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<LI><A HREF="#BrowserMatch">BrowserMatch</A>
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</LI>
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<LI><A HREF="#BrowserMatchNoCase">BrowserMatchNoCase</A>
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</LI>
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<LI><A HREF="#SetEnvIf">SetEnvIf</A>
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</LI>
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<LI><A HREF="#SetEnvIfNoCase">SetEnvIfNoCase</A>
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</LI>
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</UL>
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<HR> <!-- the HR is part of the directive description -->
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<H2><A NAME="BrowserMatch">BrowserMatch directive</A></H2>
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<P>
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> BrowserMatch <EM>regex
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env-variable</em>[=<em>value</em>] [<em>env-variable</em>[=<em>value</em>]] ...
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<BR>
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<A
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HREF="directive-dict.html#Default"
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REL="Help"
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><STRONG>Default:</STRONG></A> <i>none</i>
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<BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> server config, virtual host, directory,
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.htaccess
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<BR>
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> FileInfo
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<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base
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<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_setenvif
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<BR>
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<A
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HREF="directive-dict.html#Compatibility"
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REL="Help"
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><STRONG>Compatibility:</STRONG></A> Apache 1.2 and above (in Apache 1.2
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this directive was found in the now-obsolete mod_browser module)
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</P>
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<P>
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The BrowserMatch directive defines environment variables based on the
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<SAMP>User-Agent</SAMP> HTTP request header field. The first argument
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should be a POSIX.2 extended regular expression (similar to an
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<SAMP>egrep</SAMP>-style regex). The rest of the arguments give the
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names of variables to set, and optionally values to which they should
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be set. These take the form of
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</P>
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<OL>
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<LI><SAMP><EM>varname</EM></SAMP>, or
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</LI>
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<LI><SAMP>!<EM>varname</EM></SAMP>, or
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</LI>
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<LI><SAMP><EM>varname</EM>=<EM>value</EM></SAMP>
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</LI>
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</OL>
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<P>
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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 third will
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set the variable to the value given by <SAMP><EM>value</EM></SAMP>. If a
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<SAMP>User-Agent</SAMP> string matches more than one entry, they will
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be merged. Entries are processed in the order in which they appear,
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and later entries can override earlier ones.
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</P>
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<P>
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For example:
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</P>
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<PRE>
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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
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</PRE>
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<P>
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Note that the regular expression string is
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<STRONG>case-sensitive</STRONG>. For case-INsensitive matching, see
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the
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<A
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HREF="#BrowserMatchNoCase"
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><SAMP>BrowserMatchNoCase</SAMP></A>
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directive.
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</P>
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<P>
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The <SAMP>BrowserMatch</SAMP> and <SAMP>BrowserMatchNoCase</SAMP>
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directives are special cases of the
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<A
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HREF="#SetEnvIf"
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><SAMP>SetEnvIf</SAMP></A>
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and
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<A
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HREF="#SetEnvIfNoCase"
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><SAMP>SetEnvIfNoCase</SAMP></A>
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directives. The following two lines have the same effect:
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</P>
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<PRE>
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BrowserMatchNoCase Robot is_a_robot
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SetEnvIfNoCase User-Agent Robot is_a_robot
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</PRE>
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<HR> <!-- the HR is part of the directive description -->
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<H2>
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<A NAME="BrowserMatchNoCase">BrowserMatchNoCase directive
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</A>
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</H2>
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<P>
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> BrowserMatchNoCase <EM>regex
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env-variable</em>[=<em>value</em>] [<em>env-variable</em>[=<em>value</em>]] ...
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<BR>
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<A
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HREF="directive-dict.html#Default"
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REL="Help"
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><STRONG>Default:</STRONG></A> <EM>none</EM>
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<BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> server config, virtual host, directory,
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.htaccess
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<BR>
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> FileInfo
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<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base
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<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_setenvif
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<BR>
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<A
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HREF="directive-dict.html#Compatibility"
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REL="Help"
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><STRONG>Compatibility:</STRONG></A> Apache 1.2 and above (in Apache 1.2
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this directive was found in the now-obsolete mod_browser module)
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</P>
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<P>
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The <SAMP>BrowserMatchNoCase</SAMP> directive is semantically identical to
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the
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<A
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HREF="#BrowserMatch"
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><SAMP>BrowserMatch</SAMP></A>
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directive. However, it provides for case-insensitive matching. For
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example:
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</P>
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<PRE>
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BrowserMatchNoCase mac platform=macintosh
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BrowserMatchNoCase win platform=windows
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</PRE>
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<P>
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The <SAMP>BrowserMatch</SAMP> and <SAMP>BrowserMatchNoCase</SAMP>
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directives are special cases of the
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<A
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HREF="#SetEnvIf"
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><SAMP>SetEnvIf</SAMP></A>
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and
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<A
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HREF="#SetEnvIfNoCase"
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><SAMP>SetEnvIfNoCase</SAMP></A>
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directives. The following two lines have the same effect:
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</P>
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<PRE>
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BrowserMatchNoCase Robot is_a_robot
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SetEnvIfNoCase User-Agent Robot is_a_robot
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</PRE>
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<HR> <!-- the HR is part of the directive description -->
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<H2>
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<A NAME="SetEnvIf">SetEnvIf directive
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</A>
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</H2>
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<P>
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> SetEnvIf <EM> attribute regex
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env-variable</em>[=<em>value</em>] [<em>env-variable</em>[=<em>value</em>]] ...
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<BR>
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<A
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HREF="directive-dict.html#Default"
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REL="Help"
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><STRONG>Default:</STRONG></A> <EM>none</EM>
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<BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> server config, virtual host, directory,
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.htaccess
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<BR>
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> FileInfo
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<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base
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<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_setenvif
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<BR>
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<A
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HREF="directive-dict.html#Compatibility"
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REL="Help"
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><STRONG>Compatibility:</STRONG></A> Apache 1.3 and above; the
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Request_Protocol keyword and environment-variable matching are only
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available with 1.3.7 and later
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</P>
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<P>
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The <SAMP>SetEnvIf</SAMP> directive defines environment variables
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based on attributes of the request. These attributes can be the
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values of various HTTP request header fields (see
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<a href="http://www.rfc-editor.org/rfc/rfc2616.txt">RFC2616</a>
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for more information about these), or of other aspects of the request,
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including the following:
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</P>
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<UL>
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<LI><SAMP>Remote_Host</SAMP> - the hostname (if available) of the
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client making the request
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</LI>
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<LI><SAMP>Remote_Addr</SAMP> - the IP address of the client making
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the request
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</LI>
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<LI><SAMP>Remote_User</SAMP> - the authenticated username (if
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available)
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</LI>
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<LI><SAMP>Request_Method</SAMP> - the name of the method being used
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(<SAMP>GET</SAMP>, <SAMP>POST</SAMP>, <EM>et cetera</EM>)
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</LI>
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<LI><SAMP>Request_Protocol</SAMP> - the name and version of the protocol
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with which the request was made (<EM>e.g.</EM>, "HTTP/0.9", "HTTP/1.1",
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<EM>etc.</EM>)
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</LI>
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<LI><SAMP>Request_URI</SAMP> - the portion of the URL following the
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scheme and host portion
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</LI>
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</UL>
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<P>
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Some of the more commonly used request header field names include
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<SAMP>Host</SAMP>, <SAMP>User-Agent</SAMP>, and <SAMP>Referer</SAMP>.
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</P>
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<P>
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If the <EM>attribute</EM> name doesn't match any of the special keywords,
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nor any of the request's header field names, it is tested as the name
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of an environment variable in the list of those associated with the request.
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This allows <CODE>SetEnvIf</CODE> directives to test against the result
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of prior matches.
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</P>
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<BLOCKQUOTE>
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<STRONG>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
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scope.</STRONG>
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</BLOCKQUOTE>
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<P>
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<EM>attribute</EM> may be a regular expression when used to match a request header.
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If <EM>attribute</EM> is a regular expression and it doesn't match any of the
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request's header names, then <EM>attribute</EM> is not tested against the request's
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environment variable list.
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</P>
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<P>
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Example:
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</P>
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<PRE>
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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\.com intra_site_referral
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:
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SetEnvIf object_is_image xbm XBIT_PROCESSING=1
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:
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SetEnvIf ^TS* ^[a-z].* HAVE_TS
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</PRE>
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<P>
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The first three will set the environment variable <SAMP>object_is_image</SAMP> if the
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request was for an image file, and the fourth sets
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<SAMP>intra_site_referral</SAMP> if the referring page was somewhere
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on the <SAMP>www.mydomain.com</SAMP> Web site.
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</P>
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<P>
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The last example will set environment variable <SAMP>HAVE_TS</SAMP> if the request
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contains any headers that begin with "TS" whose values begins with any character
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in the set [a-z].
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</P>
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<HR> <!-- the HR is part of the directive description -->
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<H2>
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<A NAME="SetEnvIfNoCase">SetEnvIfNoCase directive
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</A>
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</H2>
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<P>
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> SetEnvIfNoCase <EM> attribute regex
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env-variable</em>[=<em>value</em>] [<em>env-variable</em>[=<em>value</em>]] ...
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<BR>
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<A
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HREF="directive-dict.html#Default"
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REL="Help"
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><STRONG>Default:</STRONG></A> <EM>none</EM>
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<BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> server config, virtual host, directory,
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.htaccess
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<BR>
|
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> FileInfo
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<BR>
|
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<A
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HREF="directive-dict.html#Status"
|
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REL="Help"
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><STRONG>Status:</STRONG></A> Base
|
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<BR>
|
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_setenvif
|
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<BR>
|
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<A
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HREF="directive-dict.html#Compatibility"
|
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REL="Help"
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><STRONG>Compatibility:</STRONG></A> Apache 1.3 and above
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</P>
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<P>
|
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The <SAMP>SetEnvIfNoCase</SAMP> is semantically identical to the
|
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<A
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HREF="#SetEnvIf"
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><SAMP>SetEnvIf</SAMP></A>
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directive, and differs only in that the regular expression matching is
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performed in a case-insensitive manner. For example:
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</P>
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<PRE>
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SetEnvIfNoCase Host Apache\.Org site=apache
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</PRE>
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<P>
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This will cause the <SAMP>site</SAMP> environment variable to be set to
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"<SAMP>apache</SAMP>" if the HTTP request header field
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<SAMP>Host:</SAMP> was included and contained <SAMP>Apache.Org</SAMP>,
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<SAMP>apache.org</SAMP>, or any other combination.
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</P>
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<!--#include virtual="footer.html" -->
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</BODY>
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</HTML>
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