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[quicwg/base-drafts] Should QUIC provides PING interface for upper layer? (#3567)

stormlin <notifications@github.com> Wed, 08 April 2020 03:09 UTC

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Subject: [quicwg/base-drafts] Should QUIC provides PING interface for upper layer? (#3567)
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As we know, HTTP/2 provides PING frame and corresponding PING acks, to fetch the application-layer delay. But HTTP/3 states "PING frames do not exist, since QUIC provides equivalent functionality", while QUIC only sends a PING frame to check the reachability of its peer without delay calculation.

The other way of fetching QUIC-layer delay is extracting from the congestion control module. But the application can only read dealy info when there is some data to send. It can not send a probe proactively. 

Should QUIC provides a similar interface to fetch such a application-delay?

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