net/http: add 421 status codes into status.go

[ryysud]

The following HTTP status codes are registered in the HTTP Status Code Registry, but they are not defined in the net/http package (status.go) .

• 103 Early Hints [RFC8297]
• 421 Misdirected Request [RFC7540, Section 9.1.2]

Is there a reason not to define them?

[gopherbot]

Change https://golang.org/cl/93296 mentions this issue: net/http: add missing HTTP status codes

[odeke-em]

Hello there @ryysud, thank you for raising this issue and welcome to Go!

Interesting, TIL. So from what I can quickly examine:

• 103 just got added in December 2017 and seems experimental https://tools.ietf.org/html/rfc8297

• 421 Misdirected request, perhaps that's a complex interaction with crypto/tls and x/net/http2 so I'll page the wizards @tombergan @bradfitz @agl @rs

[bradfitz]

I'm fine adding 421. Let's wait on 103 until it's finalized.

[ryysud]

@odeke-em
Thank you for your investigation.

@bradfitz
Thank you for the review.
Should I remove 103 from the CL?

[meirf]

FWIW there is some discussion of 421 in #18341, including some comments authored by a definite muggle (me).

[bradfitz]

Should I remove 103 from the CL?

Yes.

[ryysud]

@bradfitz I removed 103 from the CL.