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Re: [hybi] Dave's Framing Proposal

Dave Cridland <dave@cridland.net> Thu, 05 August 2010 22:21 UTC

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Date: Thu, 05 Aug 2010 23:22:26 +0100
From: Dave Cridland <dave@cridland.net>
To: Greg Wilkins <gregw@webtide.com>, Server-Initiated HTTP <hybi@ietf.org>
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Subject: Re: [hybi] Dave's Framing Proposal
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On Thu Aug  5 23:14:11 2010, Greg Wilkins wrote:
> I think the main essence of  what you are saying is that all frames  
> should be:
> 
>  opcode + meta-length + total-length + meta data + data
> 
> 
I'm saying that all frames have a fixed-size header, which includes a  
fixed-size length field denoting the size of the payload.

This is:

magic[1] + stream[1] + meta-length[2] + total-length[2] +  
meta[meta-length] + payload[total-length - meta-length]

> But we could also negotiate an extension to add a channel ID to  
> every
> frame (for example 0x1234)
> 
>   0x40 0x08 0x02 0x12 0x34 'hello '
>   0x00 0x07 0x02 0x12 0x34 'world'

Also no extensions change the header size, so intermediaries can be  
as dumb, and rarely upgraded, as they want.

Dave.
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