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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 2.4</a></div><div id="page-content"><div id="preamble"><h1>Expressions in Apache HTTP Server</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="./en/expr.html" title="English"> en </a> |
<a href="./fr/expr.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
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<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>
<p>The <em>ap_expr</em> expression is intended to replace most other
expression variants in HTTPD. For example, the deprecated <code class="directive"><a href="./mod/mod_ssl.html#sslrequire">SSLRequire</a></code> expressions can be replaced
by <a href="mod/mod_authz_core.html#reqexpr">Require expr</a>. </p>
</div>
<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#grammar">Grammar in Backus-Naur Form 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>
<li><img alt="" src="./images/down.gif" /> <a href="#examples">Example expressions</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#other">Other</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#sslrequire">Comparison with SSLRequire</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#compatibility">Version History</a></li>
</ul><h3>See also</h3><ul class="seealso"><li><code class="directive"><a href="./mod/core.html#if"><If></a></code></li><li><code class="directive"><a href="./mod/core.html#elseif"><ElseIf></a></code></li><li><code class="directive"><a href="./mod/core.html#else"><Else></a></code></li><li><code class="directive"><a href="./mod/core.html#errordocument">ErrorDocument</a></code></li><li><code class="directive"><a href="./mod/mod_alias.html#alias">Alias</a></code></li><li><code class="directive"><a href="./mod/mod_alias.html#scriptalias">ScriptAlias</a></code></li><li><code class="directive"><a href="./mod/mod_alias.html#redirect">Redirect</a></code></li><li><code class="directive"><a href="./mod/mod_auth_basic.html#authbasicfake">AuthBasicFake</a></code></li><li><code class="directive"><a href="./mod/mod_auth_form.html#authformloginrequiredlocation">AuthFormLoginRequiredLocation</a></code></li><li><code class="directive"><a href="./mod/mod_auth_form.html#authformloginsuccesslocation">AuthFormLoginSuccessLocation</a></code></li><li><code class="directive"><a href="./mod/mod_auth_form.html#authformlogoutlocation">AuthFormLogoutLocation</a></code></li><li><code class="directive"><a href="./mod/mod_rewrite.html#rewritecond">RewriteCond</a></code></li><li><code class="directive"><a href="./mod/mod_setenvif.html#setenvifexpr">SetEnvIfExpr</a></code></li><li><code class="directive"><a href="./mod/mod_headers.html#header">Header</a></code></li><li><code class="directive"><a href="./mod/mod_headers.html#requestheader">RequestHeader</a></code></li><li><code class="directive"><a href="./mod/mod_filter.html#filterprovider">FilterProvider</a></code></li><li><a href="mod/mod_authz_core.html#reqexpr">Require expr</a></li><li><a href="mod/mod_authnz_ldap.html#requser">Require ldap-user</a></li><li><a href="mod/mod_authnz_ldap.html#reqgroup">Require ldap-group</a></li><li><a href="mod/mod_authnz_ldap.html#reqdn">Require ldap-dn</a></li><li><a href="mod/mod_authnz_ldap.html#reqattribute">Require ldap-attribute</a></li><li><a href="mod/mod_authnz_ldap.html#reqfilter">Require ldap-filter</a></li><li><a href="mod/mod_authz_dbd.html#reqgroup">Require dbd-group</a></li><li><a href="mod/mod_authz_dbm.html#reqgroup">Require dbm-group</a></li><li><a href="mod/mod_authz_groupfile.html#reqgroup">Require group</a></li><li><a href="mod/mod_authz_host.html#reqhost">Require host</a></li><li><code class="directive"><a href="./mod/mod_ssl.html#sslrequire">SSLRequire</a></code></li><li><code class="directive"><a href="./mod/mod_log_debug.html#logmessage">LogMessage</a></code></li><li><code class="module"><a href="./mod/mod_include.html">mod_include</a></code></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="section">
<h2><a name="grammar" id="grammar">Grammar in Backus-Naur Form notation</a></h2>
<p><a href="http://en.wikipedia.org/wiki/Backus%E2%80%93Naur_Form">Backus-Naur
Form</a> (BNF) is a notation technique for context-free grammars,
often used to describe the syntax of languages used in computing.
In most cases, expressions are used to express boolean values.
For these, the starting point in the BNF is <code>expr</code>.
However, a few directives like <code class="directive"><a href="./mod/mod_log_debug.html#logmessage">LogMessage</a></code> accept expressions
that evaluate to a string value. For those, the starting point in
the BNF is <code>string</code>.
</p>
<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>!=</strong>" word
| word "<strong><</strong>" word
| word "<strong><=</strong>" word
| word "<strong>></strong>" word
| word "<strong>>=</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
| rebackref
| function
string ::= stringpart
| string stringpart
stringpart ::= cstring
| variable
| rebackref
cstring ::= ...
digit ::= [0-9]+
variable ::= "<strong>%{</strong>" varname "<strong>}</strong>"
| "<strong>%{</strong>" funcname "<strong>:</strong>" funcargs "<strong>}</strong>"
rebackref ::= "<strong>$</strong>" [0-9]
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>The expression parser provides a number of variables of the form
<code>%{HTTP_HOST}</code>. Note that the value of a variable may depend
on the phase of the request processing in which it is evaluated. For
example, an expression used in an <code class="directive"><If ></code>
directive is evaluated before authentication is done. Therefore,
<code>%{REMOTE_USER}</code> will not be set in this case.</p>
<p>The following variables provide the values of the named HTTP request
headers. The values of other headers can be obtained with the
<code>req</code> <a href="#functions">function</a>. Using these
variables may cause the header name to be added to the Vary
header of the HTTP response, except where otherwise noted for the
directive accepting the expression. The <code>req_novary</code>
<a href="#functions">function</a> may be used to circumvent this
behavior.</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_COOKIE</code></td></tr>
<tr><td><code>HTTP_FORWARDED</code></td></tr>
<tr class="odd"><td><code>HTTP_HOST</code></td></tr>
<tr><td><code>HTTP_PROXY_CONNECTION</code></td></tr>
<tr class="odd"><td><code>HTTP_REFERER</code></td></tr>
<tr><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>The HTTP method of the incoming request (e.g.
<code>GET</code>)</td></tr>
<tr class="odd"><td><code>REQUEST_SCHEME</code></td>
<td>The scheme part of the request's URI</td></tr>
<tr><td><code>REQUEST_URI</code></td>
<td>The path part of the request's URI</td></tr>
<tr class="odd"><td><code>DOCUMENT_URI</code></td>
<td>Same as <code>REQUEST_URI</code></td></tr>
<tr><td><code>REQUEST_FILENAME</code></td>
<td>The full local filesystem path to the file or script matching the
request, if this has already been determined by the server at the
time <code>REQUEST_FILENAME</code> is referenced. Otherwise, such
as when used in virtual host context, the same value as
<code>REQUEST_URI</code> </td></tr>
<tr class="odd"><td><code>SCRIPT_FILENAME</code></td>
<td>Same as <code>REQUEST_FILENAME</code></td></tr>
<tr><td><code>LAST_MODIFIED</code></td>
<td>The date and time of last modification of the file in the format
<code>20101231235959</code>, if this has already been determined by
the server at the time <code>LAST_MODIFIED</code> is referenced.
</td></tr>
<tr class="odd"><td><code>SCRIPT_USER</code></td>
<td>The user name of the owner of the script.</td></tr>
<tr><td><code>SCRIPT_GROUP</code></td>
<td>The group name of the group of the script.</td></tr>
<tr class="odd"><td><code>PATH_INFO</code></td>
<td>The trailing path name information, see
<code class="directive"><a href="./mod/core.html#acceptpathinfo">AcceptPathInfo</a></code></td></tr>
<tr><td><code>QUERY_STRING</code></td>
<td>The query string of the current request</td></tr>
<tr class="odd"><td><code>IS_SUBREQ</code></td>
<td>"<code>true</code>" if the current request is a subrequest,
"<code>false</code>" otherwise</td></tr>
<tr><td><code>THE_REQUEST</code></td>
<td>The complete request line (e.g.,
"<code>GET /index.html HTTP/1.1</code>")</td></tr>
<tr class="odd"><td><code>REMOTE_ADDR</code></td>
<td>The IP address of the remote host</td></tr>
<tr><td><code>REMOTE_PORT</code></td>
<td>The port of the remote host (2.4.26 and later)</td></tr>
<tr class="odd"><td><code>REMOTE_HOST</code></td>
<td>The host name of the remote host</td></tr>
<tr><td><code>REMOTE_USER</code></td>
<td>The name of the authenticated user, if any (not available during <code class="directive"><If></code>)</td></tr>
<tr class="odd"><td><code>REMOTE_IDENT</code></td>
<td>The user name set by <code class="module"><a href="./mod/mod_ident.html">mod_ident</a></code></td></tr>
<tr><td><code>SERVER_NAME</code></td>
<td>The <code class="directive"><a href="./mod/core.html#servername">ServerName</a></code> of
the current vhost</td></tr>
<tr class="odd"><td><code>SERVER_PORT</code></td>
<td>The server port of the current vhost, see
<code class="directive"><a href="./mod/core.html#servername">ServerName</a></code></td></tr>
<tr><td><code>SERVER_ADMIN</code></td>
<td>The <code class="directive"><a href="./mod/core.html#serveradmin">ServerAdmin</a></code> of
the current vhost</td></tr>
<tr class="odd"><td><code>SERVER_PROTOCOL</code></td>
<td>The protocol used by the request</td></tr>
<tr><td><code>DOCUMENT_ROOT</code></td>
<td>The <code class="directive"><a href="./mod/core.html#documentroot">DocumentRoot</a></code> of
the current vhost</td></tr>
<tr class="odd"><td><code>AUTH_TYPE</code></td>
<td>The configured <code class="directive"><a href="./mod/mod_authn_core.html#authtype">AuthType</a></code> (e.g.
"<code>basic</code>")</td></tr>
<tr><td><code>CONTENT_TYPE</code></td>
<td>The content type of the response (not available during <code class="directive"><If></code>)</td></tr>
<tr class="odd"><td><code>HANDLER</code></td>
<td>The name of the <a href="handler.html">handler</a> creating
the response</td></tr>
<tr><td><code>HTTP2</code></td>
<td>"<code>on</code>" if the request uses http/2,
"<code>off</code>" otherwise</td></tr>
<tr class="odd"><td><code>HTTPS</code></td>
<td>"<code>on</code>" if the request uses https,
"<code>off</code>" otherwise</td></tr>
<tr><td><code>IPV6</code></td>
<td>"<code>on</code>" if the connection uses IPv6,
"<code>off</code>" otherwise</td></tr>
<tr class="odd"><td><code>REQUEST_STATUS</code></td>
<td>The HTTP error status of the request (not available during <code class="directive"><If></code>)</td></tr>
<tr><td><code>REQUEST_LOG_ID</code></td>
<td>The error log id of the request (see
<code class="directive"><a href="./mod/core.html#errorlogformat">ErrorLogFormat</a></code>)</td></tr>
<tr class="odd"><td><code>CONN_LOG_ID</code></td>
<td>The error log id of the connection (see
<code class="directive"><a href="./mod/core.html#errorlogformat">ErrorLogFormat</a></code>)</td></tr>
<tr><td><code>CONN_REMOTE_ADDR</code></td>
<td>The peer IP address of the connection (see the
<code class="module"><a href="./mod/mod_remoteip.html">mod_remoteip</a></code> module)</td></tr>
<tr class="odd"><td><code>CONTEXT_PREFIX</code></td>
<td /></tr>
<tr><td><code>CONTEXT_DOCUMENT_ROOT</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>The current year (e.g. <code>2010</code>)</td></tr>
<tr class="odd"><td><code>TIME_MON</code></td>
<td>The current month (<code>01</code>, ..., <code>12</code>)</td></tr>
<tr><td><code>TIME_DAY</code></td>
<td>The current day of the month (<code>01</code>, ...)</td></tr>
<tr class="odd"><td><code>TIME_HOUR</code></td>
<td>The hour part of the current time
(<code>00</code>, ..., <code>23</code>)</td></tr>
<tr><td><code>TIME_MIN</code></td>
<td>The minute part of the current time </td></tr>
<tr class="odd"><td><code>TIME_SEC</code></td>
<td>The second part of the current time </td></tr>
<tr><td><code>TIME_WDAY</code></td>
<td>The day of the week (starting with <code>0</code>
for Sunday)</td></tr>
<tr class="odd"><td><code>TIME</code></td>
<td>The date and time in the format
<code>20101231235959</code></td></tr>
<tr><td><code>SERVER_SOFTWARE</code></td>
<td>The server version string</td></tr>
<tr class="odd"><td><code>API_VERSION</code></td>
<td>The date of the API version (module magic number)</td></tr>
</table>
<p>Some modules register additional variables, see e.g.
<code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code>.</p>
</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>
<h3><a name="comp" id="comp">Comparison operators</a></h3>
<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>=~</code></td>
<td />
<td>String matches the regular expression</td></tr>
<tr class="odd"><td><code>!~</code></td>
<td />
<td>String does not match the regular expression</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>
<h3><a name="binaryother" id="binaryother">Other binary operators</a></h3>
<table class="bordered"><tr class="header"><th>Name</th><th>Description</th></tr>
<tr><td><code>-ipmatch</code></td>
<td>IP address matches address/netmask</td></tr>
<tr class="odd"><td><code>-strmatch</code></td>
<td>left string matches pattern given by right string (containing
wildcards *, ?, [])</td></tr>
<tr><td><code>-strcmatch</code></td>
<td>same as <code>-strmatch</code>, but case insensitive</td></tr>
<tr class="odd"><td><code>-fnmatch</code></td>
<td>same as <code>-strmatch</code>, but slashes are not matched by
wildcards</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 take one argument and 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><th>Restricted</th></tr>
<tr><td><code>-d</code></td>
<td>The argument is treated as a filename.
True if the file exists and is a directory</td><td>yes</td></tr>
<tr class="odd"><td><code>-e</code></td>
<td>The argument is treated as a filename.
True if the file (or dir or special) exists</td><td>yes</td></tr>
<tr><td><code>-f</code></td>
<td>The argument is treated as a filename.
True if the file exists and is regular file</td><td>yes</td></tr>
<tr class="odd"><td><code>-s</code></td>
<td>The argument is treated as a filename.
True if the file exists and is not empty</td><td>yes</td></tr>
<tr><td><code>-L</code></td>
<td>The argument is treated as a filename.
True if the file exists and is symlink</td><td>yes</td></tr>
<tr class="odd"><td><code>-h</code></td>
<td>The argument is treated as a filename.
True if the file exists and is symlink
(same as <code>-L</code>)</td><td>yes</td></tr>
<tr><td><code>-F</code></td>
<td>True if string is a valid file, accessible via all the server's
currently-configured access controls for that path. This uses an
internal subrequest to do the check, so use it with care - it can
impact your server's performance!</td><td /></tr>
<tr class="odd"><td><code>-U</code></td>
<td>True if string is a valid URL, accessible via all the server's
currently-configured access controls for that path. This uses an
internal subrequest to do the check, so use it with care - it can
impact your server's performance!</td><td /></tr>
<tr><td><code>-A</code></td>
<td>Alias for <code>-U</code></td><td /></tr>
<tr class="odd"><td><code>-n</code></td>
<td>True if string is not empty</td><td /></tr>
<tr><td><code>-z</code></td>
<td>True if string is empty</td><td /></tr>
<tr class="odd"><td><code>-T</code></td>
<td>False if string is empty, "<code>0</code>", "<code>off</code>",
"<code>false</code>", or "<code>no</code>" (case insensitive).
True otherwise.</td><td /></tr>
<tr><td><code>-R</code></td>
<td>Same as "<code>%{REMOTE_ADDR} -ipmatch ...</code>", but more
efficient
</td><td /></tr>
</table>
<p>The operators marked as "restricted" are not available in some modules
like <code class="module"><a href="./mod/mod_include.html">mod_include</a></code>.</p>
</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><th>Special notes</th></tr>
<tr><td><code>req</code>, <code>http</code></td>
<td>Get HTTP request header; header names may be added to the Vary
header, see below</td><td /></tr>
<tr class="odd"><td><code>req_novary</code></td>
<td>Same as <code>req</code>, but header names will not be added to the
Vary header</td><td /></tr>
<tr><td><code>resp</code></td>
<td>Get HTTP response header (most response headers will not yet be set
during <code class="directive"><If></code>)</td><td /></tr>
<tr class="odd"><td><code>reqenv</code></td>
<td>Lookup request environment variable (as a shortcut,
<code>v</code> can also be used to access variables).
</td>
<td>ordering</td></tr>
<tr><td><code>osenv</code></td>
<td>Lookup operating system environment variable</td><td /></tr>
<tr class="odd"><td><code>note</code></td>
<td>Lookup request note</td><td>ordering</td></tr>
<tr><td><code>env</code></td>
<td>Return first match of <code>note</code>, <code>reqenv</code>,
<code>osenv</code></td><td>ordering</td></tr>
<tr class="odd"><td><code>tolower</code></td>
<td>Convert string to lower case</td><td /></tr>
<tr><td><code>toupper</code></td>
<td>Convert string to upper case</td><td /></tr>
<tr class="odd"><td><code>escape</code></td>
<td>Escape special characters in %hex encoding</td><td /></tr>
<tr><td><code>unescape</code></td>
<td>Unescape %hex encoded string, leaving encoded slashes alone;
return empty string if %00 is found</td><td /></tr>
<tr class="odd"><td><code>base64</code></td>
<td>Encode the string using base64 encoding</td><td /></tr>
<tr><td><code>unbase64</code></td>
<td>Decode base64 encoded string, return truncated string if 0x00 is
found</td><td /></tr>
<tr class="odd"><td><code>md5</code></td>
<td>Hash the string using MD5, then encode the hash with hexadecimal
encoding</td><td /></tr>
<tr><td><code>sha1</code></td>
<td>Hash the string using SHA1, then encode the hash with hexadecimal
encoding</td><td /></tr>
<tr class="odd"><td><code>file</code></td>
<td>Read contents from a file (including line endings, when present)
</td><td>restricted</td></tr>
<tr><td><code>filemod</code></td>
<td>Return last modification time of a file (or 0 if file does not exist
or is not regular file)</td><td>restricted</td></tr>
<tr class="odd"><td><code>filesize</code></td>
<td>Return size of a file (or 0 if file does not exist or is not
regular file)</td><td>restricted</td></tr>
</table>
<p>The functions marked as "restricted" in the final column are not
available in some modules like <code class="module"><a href="./mod/mod_include.html">mod_include</a></code>.</p>
<p>The functions marked as "ordering" in the final column require some
consideration for the ordering of different components of the server,
especially when the function is used within the
<<code class="directive"><a href="./mod/core.html#if">If</a></code>> directive which is
evaluated relatively early.</p>
<div class="note">
<h3>Environment variable ordering</h3>
When environment variables are looked up within an
<<code class="directive"><a href="./mod/core.html#if">If</a></code>> condition, it's important
to consider how extremely early in request processing that this
resolution occurs. As a guideline, any directive defined outside of virtual host
context (directory, location, htaccess) is not likely to have yet had a
chance to execute. <code class="directive"><a href="./mod/mod_setenvif.html#setenvif">SetEnvIf</a></code>
in virtual host scope is one directive that runs prior to this resolution
<br />
<br />
When <code>reqenv</code> is used outside of <<code class="directive"><a href="./mod/core.html#if">If</a></code>>, the resolution will generally occur later, but the
exact timing depends on the directive the expression has been used within.
</div>
<p>When the functions <code>req</code> or <code>http</code> are used,
the header name will automatically be added to the Vary header of the
HTTP response, except where otherwise noted for the directive accepting
the expression. The <code>req_novary</code> function can be used to
prevent names from being added to the Vary header.</p>
<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. <code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code>
provides <code>PeerExtList</code>. See the description of
<code class="directive"><a href="./mod/mod_ssl.html#sslrequire">SSLRequire</a></code> for details
(but <code>PeerExtList</code> is also usable outside
of <code class="directive"><a href="./mod/mod_ssl.html#sslrequire">SSLRequire</a></code>).</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="examples" id="examples">Example expressions</a></h2>
<p>The following examples show how expressions might be used to
evaluate requests:</p>
<pre class="prettyprint lang-config"># Compare the host name to example.com and redirect to www.example.com if it matches
<If "%{HTTP_HOST} == 'example.com'">
Redirect permanent "/" "http://www.example.com/"
</If>
# Force text/plain if requesting a file with the query string contains 'forcetext'
<If "%{QUERY_STRING} =~ /forcetext/">
ForceType text/plain
</If>
# Only allow access to this content during business hours
<Directory "/foo/bar/business">
Require expr %{TIME_HOUR} -gt 9 && %{TIME_HOUR} -lt 17
</Directory>
# Check a HTTP header for a list of values
<If "%{HTTP:X-example-header} in { 'foo', 'bar', 'baz' }">
Header set matched true
</If>
# Check an environment variable for a regular expression, negated.
<If "! reqenv('REDIRECT_FOO') =~ /bar/">
Header set matched true
</If>
# Check result of URI mapping by running in Directory context with -f
<Directory "/var/www">
AddEncoding x-gzip gz
<If "-f '%{REQUEST_FILENAME}.unzipme' && ! %{HTTP:Accept-Encoding} =~ /gzip/">
SetOutputFilter INFLATE
</If>
</Directory>
# Check against the client IP
<If "-R '192.168.1.0/24'">
Header set matched true
</If>
# Function example in boolean context
<If "md5('foo') == 'acbd18db4cc2f85cedef654fccc4a4d8'">
Header set checksum-matched true
</If>
# Function example in string context
Header set foo-checksum "expr=%{md5:foo}"
# This delays the evaluation of the condition clause compared to <If>
Header always set CustomHeader my-value "expr=%{REQUEST_URI} =~ m#^/special_path\.php$#"
# Conditional logging
CustomLog logs/access-errors.log common "expr=%{REQUEST_STATUS} >= 400"
CustomLog logs/access-errors-specific.log common "expr=%{REQUEST_STATUS} -in {'405','410'}"</pre>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="other" id="other">Other</a></h2>
<table class="bordered"><tr class="header"><th>Name</th><th>Alternative</th> <th>Description</th></tr>
<tr><td><code>-in</code></td>
<td><code>in</code></td>
<td>string contained in wordlist</td></tr>
<tr class="odd"><td><code>/regexp/</code></td>
<td><code>m#regexp#</code></td>
<td>Regular expression (the second form allows different
delimiters than /)</td></tr>
<tr><td><code>/regexp/i</code></td>
<td><code>m#regexp#i</code></td>
<td>Case insensitive regular expression</td></tr>
<tr class="odd"><td><code>$0 ... $9</code></td>
<td />
<td>Regular expression backreferences</td></tr>
</table>
<h3><a name="rebackref" id="rebackref">Regular expression backreferences</a></h3>
<p>The strings <code>$0</code> ... <code>$9</code> allow to reference
the capture groups from a previously executed, successfully
matching regular expressions. They can normally only be used in the
same expression as the matching regex, but some modules allow special
uses.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="sslrequire" id="sslrequire">Comparison with SSLRequire</a></h2>
<p>The <em>ap_expr</em> syntax is mostly a superset of the syntax of the
deprecated <code class="directive"><a href="./mod/mod_ssl.html#sslrequire">SSLRequire</a></code> directive.
The differences are described in <code class="directive"><a href="./mod/mod_ssl.html#sslrequire">SSLRequire</a></code>'s documentation.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="compatibility" id="compatibility">Version History</a></h2>
<p>The <code>req_novary</code> <a href="#functions">function</a>
is available for versions 2.4.4 and later.</p>
</div></div>
<div class="bottomlang">
<p><span>Available Languages: </span><a href="./en/expr.html" title="English"> en </a> |
<a href="./fr/expr.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
</div><div class="top"><a href="#page-header"><img src="./images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div>
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