If you make up HTTP error codes #cloudflare please add a text reason
HTTP/2 522
gets translated by Firefox to
Error code: 522 No Reason Phrase
Needing a google search to find out that this is a cloudflare-specific code that looks an awful lot like a duplication of HTTP error status 504 Gateway Timeout is not very helpful
@KHoos I shared this with folks internally (at Cloudflare).
Learned that https://cloudflare.com/cdn-cgi/error/{error code} provides additional information on error codes. Sharing as an FYI.
@KHoos @dbelson FWIW neither HTTP/2 or HTTP/3 define any means to emit a reason phrase. See e.g. https://datatracker.ietf.org/doc/html/rfc9114#section-4.3.2
The screenshot demonstrates the user-agent attempting to be helpful by mapping well known codes back to human-readable reason phrases. Any code they don't support, even standardized ones yet implemented, could not be mapped
The QUIC transport protocol has several features that are desirable in a transport for HTTP, such as stream multiplexing, per-stream flow control, and low-latency connection establishment. This document describes a mapping of HTTP semantics over QUIC. This document also identifies HTTP/2 features that are subsumed by QUIC and describes how HTTP/2 extensions can be ported to HTTP/3.
Koos van den Hout
David Belson
Lucas Pardue