update signature headers to point to rfc9421 #41530
                
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Description
Update the
Signature,Accept-Signature, andSignature-Inputheaders to point to the RFC9421 rather than a WICG draft. AlsoSigned-Headersseems to to not be used, so changing in favor ofSignature-Inputwhich is defined. Based on this issue, the WICG http message signatures seems somewhat obsoleted?Motivation
Points to the adopted RFC rather than draft documents
Additional details
n/a
Related issues and pull requests
(WICG/webpackage#713)
(#37701)