Webmaster in a Nutshell, Third Edition

Name

SetEnvIf

Synopsis

                     SetEnvIf 
                     attribute 
                     regex 
                     var[=value] var[=value]

[server config]

Sets environment variables based on the attributes of an HTTP request. Some of the more common attributes are:

Remote_Host

The hostname of the client, if known

Remote_Addr

The IP address of the client

Remote_User

The user which is making the request, if known

Request_Method

The name of the HTTP method being used to request information

Request_URI

The latter portion of the URL, after the host information

Referer

The URI of the referring page, if known

For example, the following sets the environment variable SOMEONE_FROM_OREILLY if the remote host resolves to the domain oreilly.com:

SetEnvIf Remote_Host oreilly.com SOMEONE_FROM_OREILLY