Earlier, I was trying to ask a question related to Internet protocols, as the question was related to networking, I tried to ask the question on Network Engineering, but the site does not contain the appropriate tags like ftp, sftp, http, etc. Though, I was able to ask the question on server fault, but shouldn't network engineering be supporting question about Internet protocols?
Network Engineering supports questions about network protocols which are not above OSI layer-4. The protocols you mention about are applications or application-layer protocols.
If you ask about those protocols on NE, you will be redirected to Server Fault for a business network, or Super User for a personal network.
You can always check What topics can I ask about here? for this type of information.