Apache Reference: mod_setenvif, BrowserMatch

BrowserMatch

Define Environment Variables Based on User-Agent
Syntax: BrowserMatch pattern [!]var[=val] [...]
Example: BrowserMatch "^Mozilla/[2-4]" ns=24
Since: Apache 1.2

This directive defines environment variables based on the HTTP User-==Agent header field. The ``BrowserMatch'' is equivalent to ``SetEnvIf User-==Agent'' and hence is a deprecated directive name.