If somebody is going to ask those questions in an interview, at the bare minimum this person must know deeply about the subject, so they can recognize a correct answer and judge their quality. Instead, from how people talk about this (I've personally stopped interviewing for a while) it looks like everybody asking those has no idea what a correct answer looks like, and just expects candidates to follow a script.

There are two things to note. First, it is incredibly unlikely that your interviewer knows deeply about both the HTTP protocol and databases implementation. Thus, anybody asking both is already full of bullshit. Second, it may be valuable to get a hold of the interviewer script and study it. People full of bullshit are not normally very creative, so the scripted answer should be easy to find at Google.