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RFC 7838, "HTTP Alternative Services", April 2016

Source of RFC: httpbis (art)

Errata ID: 6481
Status: Rejected
Type: Editorial
Publication Format(s) : TEXT

Reported By: Lucas Pardue
Date Reported: 2021-03-13
Rejected by: Francesca Palombini
Date Rejected: 2021-03-15

Section 2.4 says:

   Furthermore, if the connection to the alternative service fails or is
   unresponsive, the client MAY fall back to using the origin or another
   alternative service.  Note, however, that this could be the basis of
   a downgrade attack, thus losing any enhanced security properties of
   the alternative service.

It should say:

 ¯\_(ツ)_/¯

Notes:

Alt-Svc fall back is described in section 2.4 and mentions security properties, so I was expecting to see something about fall back in the security considerations. This might be implicitly covered by Section 9.3 but it could potentially be made more clear.
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