Status code is useless, back in 80s where error codes were used to indicate error and you had look up errors in table with matching description. We live in world of exceptions where we need to know error message and stacktrace !! We no longer simply display an error message either, we display relevant useful help links to user to troubleshoot further.
Again, authorization is independent of logic and authorization is transport specific. In HTTP you authorize every request, in WebSockets or traditional sockets you only authorize only first request. Also authorization may change based on form of authentication, still it isn't part of logic of individual operation. Transport will either execute logic if it is authorize or it will not at all execute the logic.
And see where users are moving, GraphQL, Firebase, all are additional abstraction over HTTP because HTTP wasn't sufficient. For end user it is more important to open a session, query, get results or exception irrespective of inspecting further headers and trying to investigate underlying implementation. Problem comes when you go mobile and you have very limited control over underlying transport.
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