Re: Straw Poll: Restore Header Table and Static Table Indices

[Willy Tarreau <[e-mail]>]

Hi Poul-Henning,

On Tue, Oct 21, 2014 at 09:32:55AM +0000, Poul-Henning Kamp wrote:
> --------
> In message <[e-mail]>, Willy Tarreau writes:
> 
> >I would guess they should appear in the order above, though that's not
> >obvious to me. And I'm still sad at the idea of leaving many encoding
> >values unused (eg: static header values above 16). Thus, we'll typically
> >have 48 possible values out of 256 for the first byte that will never be
> >emitted just for the indexed headers alone, that's a 20% waste, 
> 
> If you are that worried about wasted compression opportunities, you
> should spend your time to get timestamps compressed to integers since
> that will save more bytes than you can ever do by tweaking the current
> HPACK in any way.

I know, and you remember, that was one of the basic points of our
proposal 2 years ago. I think we'll hardly propose this here since
it changes the ability to pass certain invalid values. However, I
think we could do it by writing a proposal for a few header names
and their binary representation that could be used as an alternative
to Date/IMS/LM. A settings frame could indicate whether each side
supports this extension and would only emit these ones instead of
the regular ones. What do you think ?

Willy