### Apache HTTP Server Version 1.3

# Module mod_browser

This module is contained in the `mod_browser.c` file, and is compiled in by default. It provides for setting environment variables based on the browser. This module is part of Apache 1.2.* only. From Apache 1.3 onwards `mod_setenvif` provides the functionality of this module.

## Summary

This module allows you to set environment variables based on the name of the browser accessing your document, based on the `User-Agent` header field. This is especially useful when combined with a conditional HTML language such as XSSI or PHP, and can provide for simple browser-based negotiation of HTML features.

## Directives

- BrowserMatch
- BrowserMatchNoCase

## BrowserMatch

Syntax: BrowserMatch regex attr1 attr2...
Context: server config
Status: base
Module: mod_browser
Compatibility: Apache 1.2 and above

The BrowserMatch directive defines environment variables based on the User-Agent header. The first argument should be a POSIX.2 extended regular expression (similar to an egrep-style regex). The rest of the arguments give names of variables to set. These take the form of either "`varname`", "`!varname`" or "`varname=value`". In the first form, the value will be set to "1". The second will remove the given variable if already defined, and the third will set the variable to the value given by `value`. If a User-Agent string matches more than one entry, they will be merged. Entries are processed in the order they appear, and later entries can override earlier ones.

For example:

        BrowserMatch ^Mozilla forms jpeg=yes browser=netscape
        BrowserMatch "^Mozilla/[2-3]" tables agif frames javascript
        BrowserMatch MSIE !javascript

## BrowserMatchNoCase

Syntax: BrowserMatchNoCase regex attr1 attr2...
Context: server config
Status: base
Module: mod_browser
Compatibility: Apache 1.2 and above

The `BrowserMatchNoCase` directive is semantically identical to the `BrowserMatch` directive. However, it provides for case-insensitive matching. For example:

        BrowserMatchNoCase mac platform=macintosh
        BrowserMatchNoCase win platform=windows

### Apache HTTP Server Version 1.3