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[hybi] WS ABNF

"Thomson, Martin" <Martin.Thomson@andrew.com> Mon, 15 February 2010 01:10 UTC

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From: "Thomson, Martin" <Martin.Thomson@andrew.com>
To: Hybi <hybi@ietf.org>
Date: Mon, 15 Feb 2010 09:12:53 +0800
Thread-Topic: WS ABNF
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Subject: [hybi] WS ABNF
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Hi Ian,

A few ABNF comments for WS (-75 draft).

1. The ABNF for "the wire protocol as allowed by this specification" does not permit binary frames.

     frame         = text-frame / binary-frame
     binary-frame  = %x80 length *%x00-FF
     length        = %x00 / %x01-7f / ( %x81-FF *%x80-FF %x00-7F )

This is a canonical length encoding in that it doesn't allow for leading zeroes.

2. Value range alternatives (Section 3.4 of RFC 5234) should not include a second "%x".

3. The definition for text-frame in the "the wire protocol including error-handling and forward-compatible parsing rules" could be readily simplified to

    text-frame   = %x00-7F *%x00-FE %xFF

I assume that %x80-7E, as included, is in error and %xFE was the intended end of this range.

--Martin

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