Apache模块 mod_version

概述

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.

例子

      <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> 指令

<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或2.2. minor和patch are optional. If these numbers are omitted, they are assumed to be zero. The following numerical operators are possible:

示例

      <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:

示例

      <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 =.