[Mod_gzip] "mod_gzip_send_vary=Yes" disables caching on IE? (1.3.26.1a)

[Robert Collins]

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On Fri, 2002-12-06 at 19:14, Jordan Russell wrote:


> This seems like a significant 'gotcha' to me, as it can defeat the purpos=
e
> of using gzip compression in the first place. If you have a site with sta=
tic
> pages and a lot of repeat visitors using IE, the total bandwidth consumed=
 by
> "mod_gzip + no caching" could end up being higher than "no mod_gzip +
> caching".

Ouch. And let me say again, Ouch. Vary is core part of HTTP/1.1 design,
if IE is refusing to cache Vary: objects, it will cause huge issues,
given the user base. I'd file this as a severe fault with Microsoft - it
sounds like it is a regression from IE 5.5.

> Am I the first to notice this? Can anything be done about it? (Maybe
> mod_gzip should avoid sending Vary headers unless it detects signs of a
> proxy server?)

This is unreliable at best. It's a tough thing to consider though.

Rob


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