Negative result is sent to the client immediately.
Answered by sending the content of preloaded into the memory file. Request is placed into the requests queue of some application. Module process sends responses to the main process, and main process either places the returned data into the output queue of the socket, connected to the client or finishes the request processing and deletes the request descriptor. Module processes also can send other messages as described in the protocol specification. Process then can send data back either using that file descriptor or the main process.