Re: [quicwg/base-drafts] PING is reliably delivered (#2068)

[MikkelFJ <[e-mail]>]

@kazuho It is not an API issue: you cannot design an application layer protocol around PING without knowing about retransmission. For one thing it won't work if you app is too tightly coupled to one implementation, and second, you cannot make assumptions about receiving pings because you don't know if it was a retransmission.

I think some things are fine to leave to the API, such as very special things like partial delivery of streams with gaps, but you couldn't make H3 based on such assumptions, as an example. Having PING unspecified makes it unusable for general application design.

Also, it makes keep alive very error prone since you might incorrectly assume that sending ping will ensure keep alive, but in fact it only work that way for some implementations.

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