WebServer Compare Descriptions: Documents Selected Based on Accept Header/User-Agent Header

Selects Documents Based on Accept Header
The server enables the Web administrator to specify a set of responses that all may be returned for the same URL, and the rules for how the server chooses between them based on the Accept, Accept-Charset, Accept-Encoding, and Accept-Language headers. These rules must be implemented without CGI scripts. Accept headers are not part of the HTTP/1.0 spec. Selects Documents Based on Accept Header The server enables the Web administrator to specify a set of responses that all may be returned for the same URL, and the rules for how the server chooses between them based on the Accept, Accept-Charset, Accept-Encoding, and Accept-Language headers. These rules must be implemented without CGI scripts.

Selects Documents Based on User-Agent Header
The server allows the Web administrator to specify a set of responses that may all be returned for the same URL depending on the value in the User-Agent header. This must be implemented without CGI scripts.