Re: HTTP/2 GREASE, Results, and Implications
Willy Tarreau <w@1wt.eu> Thu, 31 October 2019 20:37 UTC
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Date: Thu, 31 Oct 2019 21:34:58 +0100
From: Willy Tarreau <w@1wt.eu>
To: Bence Béky <bnc@chromium.org>
Cc: Mike Bishop <mbishop@evequefou.be>, HTTP Working Group <ietf-http-wg@w3.org>
Message-ID: <20191031203458.GA31017@1wt.eu>
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Subject: Re: HTTP/2 GREASE, Results, and Implications
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On Thu, Oct 31, 2019 at 01:08:53PM -0400, Bence Béky wrote: > Thanks, Willy, for pointing out the different sections of RFC7540 > concerning unknown frame types. It seems to me that for the past few days > Chrome (on certain channels) has been sending frames on half-closed > (remote) streams. Bence, I saw that you updated the issue regarding this point. If you're going to be stricter on the states to respect the (confusing) wording of the spec, then you need to be very careful about other states for completeness: - closed: An endpoint MUST NOT send frames other than PRIORITY on a closed stream. - reserved (remote): An endpoint MUST NOT send any type of frame other than RST_STREAM, WINDOW_UPDATE, or PRIORITY in this state. - idle: Receiving any frame other than HEADERS or PRIORITY on a stream in this state MUST be treated as a connection error. I think it's reasonable to assume that only these transitions (in addition to the already mentioned half-closed) face such restrictions. This means that any new non-negociated frame type will still be allowed for the connection (stream 0) and open streams. This sounds quite reasonable and should not risk to trigger the consistency issues in the spec's wording. And at first glance if that's the case I don't need to patch my code, so we can expect that other implementations faced similar issues and that the limitations above remain acceptable (but an errata will have to be filed to keep track of this). Hoping this helps, Willy
- HTTP/2 GREASE, Results, and Implications Mike Bishop
- Re: HTTP/2 GREASE, Results, and Implications Lucas Pardue
- Re: HTTP/2 GREASE, Results, and Implications Willy Tarreau
- RE: HTTP/2 GREASE, Results, and Implications Mike Bishop
- Re: HTTP/2 GREASE, Results, and Implications Ian Swett
- Re: HTTP/2 GREASE, Results, and Implications Bence Béky
- Re: HTTP/2 GREASE, Results, and Implications Willy Tarreau
- RE: HTTP/2 GREASE, Results, and Implications Mike Bishop
- Re: HTTP/2 GREASE, Results, and Implications Lucas Pardue
- Re: HTTP/2 GREASE, Results, and Implications Willy Tarreau
- Re: HTTP/2 GREASE, Results, and Implications David Benjamin
- Re: HTTP/2 GREASE, Results, and Implications Willy Tarreau
- Re: HTTP/2 GREASE, Results, and Implications David Benjamin
- Re: HTTP/2 GREASE, Results, and Implications Willy Tarreau
- Re: HTTP/2 GREASE, Results, and Implications Willy Tarreau
- Re: HTTP/2 GREASE, Results, and Implications Bence Béky
- Re: HTTP/2 GREASE, Results, and Implications Willy Tarreau
- Re: HTTP/2 GREASE, Results, and Implications Stefan Eissing
- Re: HTTP/2 GREASE, Results, and Implications Bence Béky
- Re: HTTP/2 GREASE, Results, and Implications Willy Tarreau
- Re: HTTP/2 GREASE, Results, and Implications Tom Bergan
- Re: HTTP/2 GREASE, Results, and Implications Bence Béky
- Re: HTTP/2 GREASE, Results, and Implications Willy Tarreau
- Re: HTTP/2 GREASE, Results, and Implications Willy Tarreau
- Re: HTTP/2 GREASE, Results, and Implications Tom Bergan
- Re: HTTP/2 GREASE, Results, and Implications Willy Tarreau
- Re: HTTP/2 GREASE, Results, and Implications Dmitri Tikhonov
- Re: HTTP/2 GREASE, Results, and Implications Stefan Eissing