In section 6.2.3.1, the error response have numeric code, an "reason phrase" which is a text string that for any given number code SHOULD have it value set to a specific string. There is also an extra error_info string that can contain extra information to help debut the problem. From my point of view, I see absolutely zero value in the extra "reason_phrase" string and am wondering if we can just get rid of it. The protocol for historic reasons also mapped the error codes onto http error and error classes (i.e. 3xx, 4xx errors etc). However, the protocol does not use any of this anywhere and I worry it causes more confusion that it solves. We should consider moving the error codes just to be sequentially allocated numbers.
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