[APACHE DOCUMENTATION]

Apache HTTP Server

Custom error responses

Purpose
Additional functionality. Allows webmasters to configure the response of Apache to some error or problem.

Customizable responses can be defined to be activated in the event of a server detected error or problem.

e.g. if a script crashes and produces a "500 Seludes the encodings x-compress for compress'd files, and x-gzip for gzip'd files. The x- prefix is ignored for encoding comparisons.

Content-Length:
The size of the file. Specifying content lengths in the type-map allows the server to compare file sizes without checking the actual files.
Description:
A human-readable textual description of the variant