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+<title>Expressions in Apache - Apache HTTP Server</title>
+<link href="./style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
+<link href="./style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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+<body id="manual-page"><div id="page-header">
+<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>
+<p class="apache">Apache HTTP Server Version 2.3</p>
+<img alt="" src="./images/feather.gif" /></div>
+<div class="up"><a href="./"><img title="<-" alt="<-" src="./images/left.gif" /></a></div>
+<div id="path">
+<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="./">Version 2.3</a></div><div id="page-content"><div id="preamble"><h1>Expressions in Apache</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="./en/expr.html" title="English"> en </a></p>
+</div>
+
+ <p>Historically, there are several syntax variants for expressions used to express
+ a condition in the different modules of the Apache HTTP Server.
+ There is some ongoing effort to only use a single variant, called <em>ap_expr</em>,
+ for all configuration directives.
+ This document describes the <em>ap_expr</em> expression parser.
+ </p>
+ </div>
+<div id="quickview"><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#grammar">Grammar in BNF notation</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#vars">Variables</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#binop">Binary operators</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#unnop">Unary operators</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#functions">Functions</a></li>
+</ul></div>
+<div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="grammar" id="grammar">Grammar in BNF notation</a></h2>
+
+<blockquote>
+<pre>
+expr ::= "<strong>true</strong>" | "<strong>false</strong>"
+ | "<strong>!</strong>" expr
+ | expr "<strong>&&</strong>" expr
+ | expr "<strong>||</strong>" expr
+ | "<strong>(</strong>" expr "<strong>)</strong>"
+ | comp
+
+comp ::= stringcomp
+ | integercomp
+ | unaryop word
+ | word binaryop word
+ | word "<strong>in</strong>" "<strong>{</strong>" wordlist "<strong>}</strong>"
+ | word "<strong>in</strong>" listfunction
+ | word "<strong>=~</strong>" regex
+ | word "<strong>!~</strong>" regex
+
+
+stringcomp ::= word "<strong>==</strong>" word | word "<strong>eq</strong>" word
+ | word "<strong>!=</strong>" word | word "<strong>ne</strong>" word
+ | word "<strong><</strong>" word | word "<strong>lt</strong>" word
+ | word "<strong><=</strong>" word | word "<strong>le</strong>" word
+ | word "<strong>></strong>" word | word "<strong>gt</strong>" word
+ | word "<strong>>=</strong>" word | word "<strong>ge</strong>" word
+
+integercomp ::= word "<strong>-eq</strong>" word | word "<strong>eq</strong>" word
+ | word "<strong>-ne</strong>" word | word "<strong>ne</strong>" word
+ | word "<strong>-lt</strong>" word | word "<strong>lt</strong>" word
+ | word "<strong>-le</strong>" word | word "<strong>le</strong>" word
+ | word "<strong>-gt</strong>" word | word "<strong>gt</strong>" word
+ | word "<strong>-ge</strong>" word | word "<strong>ge</strong>" word
+
+wordlist ::= word
+ | wordlist "<strong>,</strong>" word
+
+word ::= word "<strong>.</strong>" word
+ | digit
+ | "<strong>'</strong>" string "<strong>'</strong>"
+ | "<strong>"</strong>" string "<strong>"</strong>"
+ | variable
+ | function
+
+string ::= stringpart
+ | string stringpart
+
+stringpart ::= cstring
+ | variable
+
+cstring ::= ...
+digit ::= [0-9]+
+
+variable ::= "<strong>%{</strong>" varname "<strong>}</strong>"
+ | "<strong>%{</strong>" funcname "<strong>:</strong>" funcargs "<strong>}</strong>"
+
+function ::= funcname "<strong>(</strong>" word "<strong>)</strong>"
+
+listfunction ::= listfuncname "<strong>(</strong>" word "<strong>)</strong>"
+</pre>
+</blockquote>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="vars" id="vars">Variables</a></h2>
+
+<p>XXX: not all vars are available in all request phases</p>
+
+ <p>Request headers (XXX:see req function)</p>
+
+ <table class="bordered"><tr class="header"><th>Name</th></tr>
+<tr><td><code>HTTP_ACCEPT</code></td></tr>
+<tr class="odd"><td><code>HTTP_FORWARDED</code></td></tr>
+<tr><td><code>HTTP_HOST</code></td></tr>
+<tr class="odd"><td><code>HTTP_PROXY_CONNECTION</code></td></tr>
+<tr><td><code>HTTP_REFERER</code></td></tr>
+<tr class="odd"><td><code>HTTP_USER_AGENT</code></td></tr>
+</table>
+
+ <p>Other request related variables</p>
+
+ <table class="bordered"><tr class="header"><th>Name</th><th>Description</th></tr>
+<tr><td><code>REQUEST_METHOD</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>REQUEST_SCHEME</code></td>
+ <td /></tr>
+<tr><td><code>REQUEST_URI</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>REQUEST_FILENAME</code></td>
+ <td /></tr>
+<tr><td><code>REMOTE_HOST</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>REMOTE_IDENT</code></td>
+ <td /></tr>
+<tr><td><code>REMOTE_USER</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>SERVER_ADMIN</code></td>
+ <td /></tr>
+<tr><td><code>SERVER_NAME</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>SERVER_PORT</code></td>
+ <td /></tr>
+<tr><td><code>SERVER_PROTOCOL</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>SCRIPT_FILENAME</code></td>
+ <td /></tr>
+<tr><td><code>PATH_INFO</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>QUERY_STRING</code></td>
+ <td /></tr>
+<tr><td><code>IS_SUBREQ</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>DOCUMENT_ROOT</code></td>
+ <td /></tr>
+<tr><td><code>AUTH_TYPE</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>THE_REQUEST</code></td>
+ <td /></tr>
+<tr><td><code>CONTENT_TYPE</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>REMOTE_ADDR</code></td>
+ <td /></tr>
+<tr><td><code>HTTPS</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>IPV6</code></td>
+ <td /></tr>
+</table>
+
+ <p>Misc variables</p>
+
+ <table class="bordered"><tr class="header"><th>Name</th><th>Description</th></tr>
+<tr><td><code>TIME_YEAR</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>TIME_MON</code></td>
+ <td /></tr>
+<tr><td><code>TIME_DAY</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>TIME_HOUR</code></td>
+ <td /></tr>
+<tr><td><code>TIME_MIN</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>TIME_SEC</code></td>
+ <td /></tr>
+<tr><td><code>TIME_WDAY</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>TIME</code></td>
+ <td /></tr>
+<tr><td><code>SERVER_SOFTWARE</code></td>
+ <td /></tr>
+<tr class="odd"><td><code>API_VERSION</code></td>
+ <td /></tr>
+</table>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="binop" id="binop">Binary operators</a></h2>
+
+
+ <p>With the exception of some built-in comparison operators, binary
+ operators have the form "<code>-[a-zA-Z][a-zA-Z0-9_]+</code>", i.e. a
+ minus and at least two characters. The name is not case sensitive.
+ Modules may register additional binary operators.</p>
+
+ <table class="bordered"><tr class="header"><th>Name</th><th>Alternative</th> <th>Description</th></tr>
+<tr><td><code>==</code></td>
+ <td><code>=</code></td>
+ <td>String equality</td></tr>
+<tr class="odd"><td><code>!=</code></td>
+ <td />
+ <td>String inequality</td></tr>
+<tr><td><code><</code></td>
+ <td />
+ <td>String less than</td></tr>
+<tr class="odd"><td><code><=</code></td>
+ <td />
+ <td>String less than or equal</td></tr>
+<tr><td><code>></code></td>
+ <td />
+ <td>String greater than</td></tr>
+<tr class="odd"><td><code>>=</code></td>
+ <td />
+ <td>String greater than or equal</td></tr>
+<tr><td><code>-eq</code></td>
+ <td><code>eq</code></td>
+ <td>Integer equality</td></tr>
+<tr class="odd"><td><code>-ne</code></td>
+ <td><code>ne</code></td>
+ <td>Integer inequality</td></tr>
+<tr><td><code>-lt</code></td>
+ <td><code>lt</code></td>
+ <td>Integer less than</td></tr>
+<tr class="odd"><td><code>-le</code></td>
+ <td><code>le</code></td>
+ <td>Integer less than or equal</td></tr>
+<tr><td><code>-gt</code></td>
+ <td><code>gt</code></td>
+ <td>Integer greater than</td></tr>
+<tr class="odd"><td><code>-ge</code></td>
+ <td><code>ge</code></td>
+ <td>Integer greater than or equal</td></tr>
+</table>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="unnop" id="unnop">Unary operators</a></h2>
+
+
+ <p>Unary operators have the form "<code>-[a-zA-Z]</code>", i.e. a
+ minus and one character. The name <em>is</em> case sensitive.
+ Modules may register additional unary operators.</p>
+
+ <table class="bordered"><tr class="header"><th>Name</th><th>Description</th></tr>
+<tr><td><code>-n</code></td>
+ <td>String is not empty (XXX: not yet implemented)</td></tr>
+<tr class="odd"><td><code>-z</code></td>
+ <td>String is empty (XXX: not yet implemented)</td></tr>
+</table>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="functions" id="functions">Functions</a></h2>
+
+
+ <p>Normal string-valued functions take one string as argument and return
+ a string. Functions names are not case sensitive.
+ Modules may register additional functions.</p>
+
+ <table class="bordered"><tr class="header"><th>Name</th><th>Description</th></tr>
+<tr><td><code>req</code>, <code>http</code></td>
+ <td>Get HTTP request header</td></tr>
+<tr class="odd"><td><code>resp</code></td>
+ <td>Get HTTP response header</td></tr>
+<tr><td><code>osenv</code></td>
+ <td>Lookup operating system environment variable</td></tr>
+<tr class="odd"><td><code>env</code></td>
+ <td>Lookup request environment variable (XXX: will need to be changed for better ssl_expr compat)</td></tr>
+<tr><td><code>lolower</code></td>
+ <td>Convert string to lower case</td></tr>
+<tr class="odd"><td><code>toupper</code></td>
+ <td>Convert string to uppser case</td></tr>
+<tr><td><code>escape</code></td>
+ <td>Escape special characters in %hex encoding</td></tr>
+<tr class="odd"><td><code>unescape</code></td>
+ <td>Unescape %hex encoded string, leaving URL-special characters encoded (XXX: describe better)</td></tr>
+</table>
+
+ <p>In addition to string-valued functions, there are also list-valued functions which
+ take one string as argument and return a wordlist, i.e. a list of strings. The wordlist
+ can be used with the special <code>-in</code> operator.
+ Functions names are not case sensitive.
+ Modules may register additional functions.</p>
+
+ <p>There are no built-in list-valued functions. mod_ssl provides
+ <code>PeerExtList</code> (XXX: link)</p>
+
+</div></div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="./en/expr.html" title="English"> en </a></p>
+</div><div id="footer">
+<p class="apache">Copyright 2010 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>
+</body></html>
\ No newline at end of file
--- /dev/null
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE manualpage SYSTEM "./style/manualpage.dtd">
+<?xml-stylesheet type="text/xsl" href="./style/manual.en.xsl"?>
+<!-- $LastChangedRevision$ -->
+
+<!--
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+
+<manualpage metafile="expr.xml.meta">
+
+ <title>Expressions in Apache</title>
+
+ <summary>
+ <p>Historically, there are several syntax variants for expressions used to express
+ a condition in the different modules of the Apache HTTP Server.
+ There is some ongoing effort to only use a single variant, called <em>ap_expr</em>,
+ for all configuration directives.
+ This document describes the <em>ap_expr</em> expression parser.
+ </p>
+ </summary>
+
+ <section id="grammar">
+ <title>Grammar in BNF notation</title>
+<blockquote>
+<pre>
+expr ::= "<strong>true</strong>" | "<strong>false</strong>"
+ | "<strong>!</strong>" expr
+ | expr "<strong>&&</strong>" expr
+ | expr "<strong>||</strong>" expr
+ | "<strong>(</strong>" expr "<strong>)</strong>"
+ | comp
+
+comp ::= stringcomp
+ | integercomp
+ | unaryop word
+ | word binaryop word
+ | word "<strong>in</strong>" "<strong>{</strong>" wordlist "<strong>}</strong>"
+ | word "<strong>in</strong>" listfunction
+ | word "<strong>=~</strong>" regex
+ | word "<strong>!~</strong>" regex
+
+
+stringcomp ::= word "<strong>==</strong>" word | word "<strong>eq</strong>" word
+ | word "<strong>!=</strong>" word | word "<strong>ne</strong>" word
+ | word "<strong><</strong>" word | word "<strong>lt</strong>" word
+ | word "<strong><=</strong>" word | word "<strong>le</strong>" word
+ | word "<strong>></strong>" word | word "<strong>gt</strong>" word
+ | word "<strong>>=</strong>" word | word "<strong>ge</strong>" word
+
+integercomp ::= word "<strong>-eq</strong>" word | word "<strong>eq</strong>" word
+ | word "<strong>-ne</strong>" word | word "<strong>ne</strong>" word
+ | word "<strong>-lt</strong>" word | word "<strong>lt</strong>" word
+ | word "<strong>-le</strong>" word | word "<strong>le</strong>" word
+ | word "<strong>-gt</strong>" word | word "<strong>gt</strong>" word
+ | word "<strong>-ge</strong>" word | word "<strong>ge</strong>" word
+
+wordlist ::= word
+ | wordlist "<strong>,</strong>" word
+
+word ::= word "<strong>.</strong>" word
+ | digit
+ | "<strong>'</strong>" string "<strong>'</strong>"
+ | "<strong>"</strong>" string "<strong>"</strong>"
+ | variable
+ | function
+
+string ::= stringpart
+ | string stringpart
+
+stringpart ::= cstring
+ | variable
+
+cstring ::= ...
+digit ::= [0-9]+
+
+variable ::= "<strong>%{</strong>" varname "<strong>}</strong>"
+ | "<strong>%{</strong>" funcname "<strong>:</strong>" funcargs "<strong>}</strong>"
+
+function ::= funcname "<strong>(</strong>" word "<strong>)</strong>"
+
+listfunction ::= listfuncname "<strong>(</strong>" word "<strong>)</strong>"
+</pre>
+</blockquote>
+
+</section>
+
+<section id="vars">
+ <title>Variables</title>
+<p>XXX: not all vars are available in all request phases</p>
+
+ <p>Request headers (XXX:see req function)</p>
+
+ <table border="1" style="zebra">
+ <columnspec><column width="1"/></columnspec>
+
+ <tr><th>Name</th></tr>
+ <tr><td><code>HTTP_ACCEPT</code></td></tr>
+ <tr><td><code>HTTP_FORWARDED</code></td></tr>
+ <tr><td><code>HTTP_HOST</code></td></tr>
+ <tr><td><code>HTTP_PROXY_CONNECTION</code></td></tr>
+ <tr><td><code>HTTP_REFERER</code></td></tr>
+ <tr><td><code>HTTP_USER_AGENT</code></td></tr>
+
+ </table>
+
+ <p>Other request related variables</p>
+
+ <table border="1" style="zebra">
+ <columnspec><column width=".4"/><column width=".6"/></columnspec>
+
+ <tr><th>Name</th><th>Description</th></tr>
+ <tr><td><code>REQUEST_METHOD</code></td>
+ <td></td></tr>
+ <tr><td><code>REQUEST_SCHEME</code></td>
+ <td></td></tr>
+ <tr><td><code>REQUEST_URI</code></td>
+ <td></td></tr>
+ <tr><td><code>REQUEST_FILENAME</code></td>
+ <td></td></tr>
+ <tr><td><code>REMOTE_HOST</code></td>
+ <td></td></tr>
+ <tr><td><code>REMOTE_IDENT</code></td>
+ <td></td></tr>
+ <tr><td><code>REMOTE_USER</code></td>
+ <td></td></tr>
+ <tr><td><code>SERVER_ADMIN</code></td>
+ <td></td></tr>
+ <tr><td><code>SERVER_NAME</code></td>
+ <td></td></tr>
+ <tr><td><code>SERVER_PORT</code></td>
+ <td></td></tr>
+ <tr><td><code>SERVER_PROTOCOL</code></td>
+ <td></td></tr>
+ <tr><td><code>SCRIPT_FILENAME</code></td>
+ <td></td></tr>
+ <tr><td><code>PATH_INFO</code></td>
+ <td></td></tr>
+ <tr><td><code>QUERY_STRING</code></td>
+ <td></td></tr>
+ <tr><td><code>IS_SUBREQ</code></td>
+ <td></td></tr>
+ <tr><td><code>DOCUMENT_ROOT</code></td>
+ <td></td></tr>
+ <tr><td><code>AUTH_TYPE</code></td>
+ <td></td></tr>
+ <tr><td><code>THE_REQUEST</code></td>
+ <td></td></tr>
+ <tr><td><code>CONTENT_TYPE</code></td>
+ <td></td></tr>
+ <tr><td><code>REMOTE_ADDR</code></td>
+ <td></td></tr>
+ <tr><td><code>HTTPS</code></td>
+ <td></td></tr>
+ <tr><td><code>IPV6</code></td>
+ <td></td></tr>
+
+ </table>
+
+ <p>Misc variables</p>
+
+ <table border="1" style="zebra">
+ <columnspec><column width=".4"/><column width=".6"/></columnspec>
+
+ <tr><th>Name</th><th>Description</th></tr>
+ <tr><td><code>TIME_YEAR</code></td>
+ <td></td></tr>
+ <tr><td><code>TIME_MON</code></td>
+ <td></td></tr>
+ <tr><td><code>TIME_DAY</code></td>
+ <td></td></tr>
+ <tr><td><code>TIME_HOUR</code></td>
+ <td></td></tr>
+ <tr><td><code>TIME_MIN</code></td>
+ <td></td></tr>
+ <tr><td><code>TIME_SEC</code></td>
+ <td></td></tr>
+ <tr><td><code>TIME_WDAY</code></td>
+ <td></td></tr>
+ <tr><td><code>TIME</code></td>
+ <td></td></tr>
+ <tr><td><code>SERVER_SOFTWARE</code></td>
+ <td></td></tr>
+ <tr><td><code>API_VERSION</code></td>
+ <td></td></tr>
+ </table>
+
+</section>
+
+<section id="binop">
+ <title>Binary operators</title>
+
+ <p>With the exception of some built-in comparison operators, binary
+ operators have the form "<code>-[a-zA-Z][a-zA-Z0-9_]+</code>", i.e. a
+ minus and at least two characters. The name is not case sensitive.
+ Modules may register additional binary operators.</p>
+
+ <table border="1" style="zebra">
+ <columnspec><column width=".2"/><column width=".2"/><column width=".6"/></columnspec>
+
+ <tr><th>Name</th><th>Alternative</th> <th>Description</th></tr>
+ <tr><td><code>==</code></td>
+ <td><code>=</code></td>
+ <td>String equality</td></tr>
+ <tr><td><code>!=</code></td>
+ <td></td>
+ <td>String inequality</td></tr>
+ <tr><td><code><</code></td>
+ <td></td>
+ <td>String less than</td></tr>
+ <tr><td><code><=</code></td>
+ <td></td>
+ <td>String less than or equal</td></tr>
+ <tr><td><code>></code></td>
+ <td></td>
+ <td>String greater than</td></tr>
+ <tr><td><code>>=</code></td>
+ <td></td>
+ <td>String greater than or equal</td></tr>
+ <tr><td><code>-eq</code></td>
+ <td><code>eq</code></td>
+ <td>Integer equality</td></tr>
+ <tr><td><code>-ne</code></td>
+ <td><code>ne</code></td>
+ <td>Integer inequality</td></tr>
+ <tr><td><code>-lt</code></td>
+ <td><code>lt</code></td>
+ <td>Integer less than</td></tr>
+ <tr><td><code>-le</code></td>
+ <td><code>le</code></td>
+ <td>Integer less than or equal</td></tr>
+ <tr><td><code>-gt</code></td>
+ <td><code>gt</code></td>
+ <td>Integer greater than</td></tr>
+ <tr><td><code>-ge</code></td>
+ <td><code>ge</code></td>
+ <td>Integer greater than or equal</td></tr>
+ </table>
+
+</section>
+
+<section id="unnop">
+ <title>Unary operators</title>
+
+ <p>Unary operators have the form "<code>-[a-zA-Z]</code>", i.e. a
+ minus and one character. The name <em>is</em> case sensitive.
+ Modules may register additional unary operators.</p>
+
+ <table border="1" style="zebra">
+ <columnspec><column width=".2"/><column width=".2"/><column width=".6"/></columnspec>
+
+ <tr><th>Name</th><th>Description</th></tr>
+ <tr><td><code>-n</code></td>
+ <td>String is not empty (XXX: not yet implemented)</td></tr>
+ <tr><td><code>-z</code></td>
+ <td>String is empty (XXX: not yet implemented)</td></tr>
+ </table>
+
+</section>
+
+<section id="functions">
+ <title>Functions</title>
+
+ <p>Normal string-valued functions take one string as argument and return
+ a string. Functions names are not case sensitive.
+ Modules may register additional functions.</p>
+
+ <table border="1" style="zebra">
+ <columnspec><column width=".2"/><column width=".8"/></columnspec>
+
+ <tr><th>Name</th><th>Description</th></tr>
+ <tr><td><code>req</code>, <code>http</code></td>
+ <td>Get HTTP request header</td></tr>
+ <tr><td><code>resp</code></td>
+ <td>Get HTTP response header</td></tr>
+ <tr><td><code>osenv</code></td>
+ <td>Lookup operating system environment variable</td></tr>
+ <tr><td><code>env</code></td>
+ <td>Lookup request environment variable (XXX: will need to be changed for better ssl_expr compat)</td></tr>
+ <tr><td><code>lolower</code></td>
+ <td>Convert string to lower case</td></tr>
+ <tr><td><code>toupper</code></td>
+ <td>Convert string to uppser case</td></tr>
+ <tr><td><code>escape</code></td>
+ <td>Escape special characters in %hex encoding</td></tr>
+ <tr><td><code>unescape</code></td>
+ <td>Unescape %hex encoded string, leaving URL-special characters encoded (XXX: describe better)</td></tr>
+ </table>
+
+ <p>In addition to string-valued functions, there are also list-valued functions which
+ take one string as argument and return a wordlist, i.e. a list of strings. The wordlist
+ can be used with the special <code>-in</code> operator.
+ Functions names are not case sensitive.
+ Modules may register additional functions.</p>
+
+ <p>There are no built-in list-valued functions. mod_ssl provides
+ <code>PeerExtList</code> (XXX: link)</p>
+
+</section>
+
+</manualpage>
projects / thirdparty / apache / httpd.git / commitdiff
