Is is possible to receive multiple gun_response messages for a single request?

[erlend-axelsson]

Probably dumb question, but is possible to receive multiple {gun_response, ConnPid, StreamRef, IsFin, Status, Headers} messages for a single request?(*) Or is the IsFin argument there to notify that the response does not contain a body?

Reason for asking is whether I need to implement code to merge multiple Header lists together when I collect the response, or if I can simply assume that this message will only arrive once per StreamRef.

(*) For "standard Http verbs" GET/POST/DELETE etc, I'm not handling Server Push, Tunnels or WS at the moment.

[essen]

You may get 0..N gun_inform followed by gun_response, where IsFin indicates whether the response is complete. After that the body may follow, and optionally gun_trailers.

Typically informational response headers shouldn't be merged as they can be completely ignored.

Trailer headers on the other hand are roughly the same as the response headers, only they arrive after the body. But since they arrive after the body, which may be very large, they are not normally merged. They are handled the same but separately (two sets of header fields). https://www.rfc-editor.org/rfc/rfc9110.html#name-processing-trailer-fields

So I don't think you need to merge headers together except if you always need to add some headers to HTTP requests.

I recommend reading https://www.rfc-editor.org/rfc/rfc9110.html if you need more info on how to process HTTP messages.

[erlend-axelsson]

Thank you :).

This will simplify the code I have to write as I don't need to account for the edge case of multiple {gun_response ...} messages.