https://tools.ietf.org/html/rfc8297 defines this new HTTP status that can be used by the server to give clients "early hints" that certain resources will be required by the eventual response. The GoDoc for the ResponseWriter.WriteHeader method currently states:"Only one header may be written. Go does not currently support sending user-defined 1xx informational headers, with the exception of 100-continue response header". Presumably this precludes the use of the new 103 status. Has the Go team given any thought to adding support for it?
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