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Apache HTTP Server Version 2.4

Apache > HTTP Server > Documentation > Version 2.4 > Modules

Apache Module mod_version

Description:	Version dependent configuration
Status:	Extension
Module Identifier:	version_module
Source File:	mod_version.c

Summary

This module is designed for the use in test suites and large networks which have to deal with different httpd versions and different configurations. It provides a new container -- <IfVersion>, which allows a flexible version checking including numeric comparisons and regular expressions.

Examples

<IfVersion 2.4.2>
    # current httpd version is exactly 2.4.2
</IfVersion>

<IfVersion >= 2.5>
    # use really new features :-)
</IfVersion>

See below for further possibilities.

Directives

• <IfVersion>

Bugfix checklist

• httpd changelog
• Known issues
• Report a bug

See also

• Comments

<IfVersion> Directive

Description:	contains version dependent configuration
Syntax:	<IfVersion [[!]operator] version> ... </IfVersion>
Context:	server config, virtual host, directory, .htaccess
Override:	All
Status:	Extension
Module:	mod_version

The <IfVersion> section encloses configuration directives which are executed only if the httpd version matches the desired criteria. For normal (numeric) comparisons the version argument has the format major[.minor[.patch]], e.g. 2.1.0 or 2.2. minor and patch are optional. If these numbers are omitted, they are assumed to be zero. The following numerical operators are possible:

operator	description
= or ==	httpd version is equal
>	httpd version is greater than
>=	httpd version is greater or equal
<	httpd version is less than
<=	httpd version is less or equal

Example

<IfVersion >= 2.3>
    # this happens only in versions greater or
    # equal 2.3.0.
</IfVersion>

Besides the numerical comparison it is possible to match a regular expression against the httpd version. There are two ways to write it:

operator	description
= or ==	version has the form /regex/
~	version has the form regex

Example

<IfVersion = /^2.4.[01234]$/>
    # e.g. workaround for buggy versions
</IfVersion>

In order to reverse the meaning, all operators can be preceded by an exclamation mark (!):

<IfVersion !~ ^2.4.[01234]$>
    # not for those versions
</IfVersion>

If the operator is omitted, it is assumed to be =.