Modules | ... Apache HTTP Server Version 2.4 . ... In order to assist folks upgrading, we maintain a document describing information critical to existing Apache HTTP Server users. ... This document describes changes in server behavior that might require you to change your configuration or how you use the server in order to continue using 2.4 as you are currently using 2.2. ... Many third-party modules designed for version 2.2 will otherwise work unchanged with the Apache HTTP Server version 2.4. ...