mod_version
Version dependent configuration
Extension
mod_version.c
version_module
Available in version 2.0.56 and later

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 2.1.0>
# current httpd version is exactly 2.1.0
</IfVersion>
<IfVersion >= 2.2>
# use really new features :-)
</IfVersion>

See below for further possibilities.

IfVersion
contains version dependent configuration
<IfVersion [[!]operator] version> ... </IfVersion>
server config
virtual host
directory
.htaccess
All

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 >= 2.1>
# this happens only in versions greater or
# equal 2.1.0.
</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 = /^2.1.[01234]$/>
# e.g. workaround for buggy versions
</IfVersion>

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

<IfVersion !~ ^2.1.[01234]$>
# not for those versions
</IfVersion>

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