Disable some specific protocols when they are not enabled in server

If server doesn't support rtmp, redis, etc., we want to skip the request parsing process using these protocols.

Start by locating the server request-parsing entry points and the code that determines which protocols are enabled. Trace how unsupported RTMP, Redis, and similar protocols are currently handled. Done means requests using disabled protocols bypass their parsing process, with the behavior verified by appropriate tests.

Written by the indexing model from the issue text.