Document Digest Fields per rfc9530 and redirect `Digest` and `Want-Digest` header pages

[Elchi3]

MDN URL

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Digest

What specific section or headline is this issue about?

No response

What information was incorrect, unhelpful, or incomplete?

The https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Digest and https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Want-Digest HTTP header reference pages are outdated.

RFC9530 is new https://www.rfc-editor.org/rfc/rfc9530:

This document defines HTTP fields that support integrity digests. The Content-Digest field can be used for the integrity of HTTP message content. The Repr-Digest field can be used for the integrity of HTTP representations. Want-Content-Digest and Want-Repr-Digest can be used to indicate a sender's interest and preferences for receiving the respective Integrity fields.

This document obsoletes RFC 3230 and the Digest and Want-Digest HTTP fields.

What did you expect to see?

HTTP header reference docs for:

• Content-Digest
• Repr-Digest
• Want-Content-Digest
• Want-Repr-Digest

And probably a supporting guide page, integration into the rest of the HTTP docs, etc.

Do you have any supporting links, references, or citations?

https://www.rfc-editor.org/rfc/rfc9530

Do you have anything more you want to share?

In BCD we removed the obsolete rfc urls already: https://github.com/mdn/browser-compat-data/pull/22263

[bsmth]

The following PR adds the missing pages:

• [x] https://github.com/mdn/content/pull/26885

It looks like we still need BCD for this, and "a supporting guide page" as you mentioned.