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Re: [quicwg/base-drafts] Why are there two ways of associating push with requests? (#3275)

ianswett <notifications@github.com> Wed, 04 December 2019 13:54 UTC

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Date: Wed, 04 Dec 2019 05:54:22 -0800
From: ianswett <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Why are there two ways of associating push with requests? (#3275)
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I'd suggest removing DUPLICATE_PUSH and allowing duplicate PUSH_PROMISE frames on different response streams.  I'd be hesitant to make larger changes at this point and I think Push IDs are an improvement over HTTP/2.

DUPLICATE_PUSH saves a few bytes over an equivalent PUSH_PROMISE, but I believe has no value.  Think of the two cases:
1) No loss or reordering, the client has already received the PUSH_PROMISE.  DUPLICATE_PUSH should not change the client response.
2) DUPLICATE_PUSH arrives before PUSH_PROMISE.  But the client doesn't know what was pushed.  It has the choice of indefinitely delaying all requests on the page, which is almost certainly a performance degradation in most cases or ignoring it.

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