Documentation is available for current, development, and historical versions of Apache httpd. Downloadable zip files of the documentation, for your offline use, are available in various languages on our distribution siite.
Trunk (Development / Draft)
Version 2.2 (Historical)
Version 2.0 (Historical)
There is also a Documentation Wiki for user-contributed recipes, tips, and tricks.
The documentation is maintained by the documentation project. We'd love to have your help to improve the docs.