Re: [quicwg/base-drafts] Don't store or retransmit PATH_RESPONSE frames, avoid buffering (#2729)

[MikkelFJ <[e-mail]>]

mikkelfj commented on this pull request.



> @@ -1721,7 +1721,12 @@ it can associate the peer's response with the corresponding PATH_CHALLENGE.
 ## Path Validation Responses
 
 On receiving a PATH_CHALLENGE frame, an endpoint MUST respond immediately by
-echoing the data contained in the PATH_CHALLENGE frame in a PATH_RESPONSE frame.
+echoing the data contained in the PATH_CHALLENGE frame in a PATH_RESPONSE frame,
+unless it has PATH_RESPONSE frames buffered for the same destination connection
+ID and wishes to limit memory consumption.
+
+An endpoint MUST NOT store or retransmit a PATH_RESPONSE frame, as a new
+PATH_CHALLENGE frame will be sent if another PATH_RESPONSE frame is needed.
 

I rather prefer the principle where you can process a frame without knowing the rest of the packet content. Since challenges are not retransmitted with the complexity that could entail, it is simpler to send at most one challenge per packet.

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