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Re: HPACK: Invalid Maximum Table Size

From: Martin Thomson <martin.thomson@gmail.com>
Date: Sun, 18 Jan 2015 13:04:36 -0800
Message-ID: <CABkgnnUk2hKyT9xyhPGo5b2_rXThSnEyHO1xM-ZFM-ESnqw_yg@mail.gmail.com>
To: "Simpson, Robby (GE Energy Management)" <robby.simpson@ge.com>
Cc: "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>
Opened as https://github.com/http2/http2-spec/issues/676

On 12 January 2015 at 07:14, Simpson, Robby (GE Energy Management)
<robby.simpson@ge.com> wrote:
> Section 4.2 of draft-ietf-httpbis-header-compression-10 states:
>> Protocols that use HPACK determine the maximum size that the encoder
>> is permitted to use for the dynamic table.  In HTTP/2, this value is
>> determined by the SETTINGS_HEADER_TABLE_SIZE setting (see
>> Section 6.5.2 of [HTTP2]).
>> An encoder can choose to use less capacity than this maximum size
>> (see Section 6.3), but the chosen size MUST stay lower than or equal
>> to the maximum set by the protocol.
> I could not find any text stating what should occur if the requirement
> (MUST) is violated.
> In other words, if an encoder specifies a maximum table size larger than
> the decoder's SETTINGS_HEADER_TABLE_SIZE setting, what should occur?
> I'm guessing this would be a connection error of type COMPRESSION_ERROR,
> as the compression state is likely ruined at that point.
> Given this can result in compression state mismatch, I think we need
> explicit text stating the handling.  Should said text go in
> draft-ietf-httpbis-header-compression or draft-ietf-httpbis-http2, as it
> appears that draft-ietf-httpbis-header-compression attempts to be
> protocol-agnostic?
> Thanks,
> Robby
Received on Sunday, 18 January 2015 21:05:08 UTC

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