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http://http2.github.io/http2-spec/#FrameHeader section on Flags being unset

From: (wrong string) 陈智昌 <willchan@google.com>
Date: Wed, 8 May 2013 15:26:47 -0300
Message-ID: <CAA4WUYgewyw-N2vjTinaQkarL0brveCam2XKKBSrMzz4HMiT8A@mail.gmail.com>
To: HTTP Working Group <ietf-http-wg@w3.org>
The remaining flags can be assigned semantics specific to the indicated
frame type. Flags that have no defined semantics for a particular frame
type MUST be ignored, and MUST be left unset (0) when sending.

Is there a reason that it MUST be left unset? Why not allow extensibility
like we do for unknown frames? I actually don't think there's much value to
specifying behavior for unused bits.
Received on Wednesday, 8 May 2013 18:27:15 UTC

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