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webtransport: add message framing to allow graceful stream closing #606
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Not sure if this is an issue, but the
flag
field is optional and the0
value starts closing the stream.If you were to write a data message following
proto3
semantics which let you omit theflag
field, then read the message usingproto2
semantics, theflag
field would get initialised to it's default value of0
and the receiver would think the sender wanted to close the stream.We can work around this by having a
NIL
flag as the0
value, which would be ignored by any receiver when read by aproto2
orproto3
decoder.Or we expect implementations to apply
proto3
semantics because that's what the definition here says.