Modules | ... Apache HTTP Server Version 2.2 . ... Several changes in 2.0 and above affect the internal request processing mechanics. ... The Request Processing Cycle . The Request Parsing Phase . ... If a module doesn't pass generated requests through this code, the author is cautioned that the module may be broken by future changes to request processing. ... After the core, or a module calls ap_process_request_internal() it then calls ap_invoke_handler() to generate the request. ...