Re: [load balancing] F5 3400 with 9.0.4, compression issues

From: Computer Guy <ethersecIZZATyahoo.com>
Date: Tue Apr 05 2005 - 00:39:46 EDT

I see 9.0.5 was recently released, but it doesn't
indicate any fixes to the compression engine.

I'm curious to know, was this issue resolved; and if
so what's the solution.

Thanks.

--- William Bivens <wjbivens@digitalme.com> wrote:

> Brian,
>
> The purpose of the Vary header regarding compression
> is primarily to prevent
> intermediate caches from storing compressed content
> because it could be
> served up to browsers/proxies that don't support
> compressed content. The
> goal is to tell the cache that the content could
> vary from
> user-agent/accept-encoding.
>
> I believe the reason that the page/back button
> breaks is because IE has a
> bug that doesn't allow it to render "cached" pages
> with the Vary header.
>
> Maybe what Shayne was pointing out is that most
> compression devices are
> looking for the "Accept-Encoding: gzip,deflate"
> before trying to compress
> content since it the device wants to see if the
> browser supports it. So
> turning off "Accept-Encoding" would indicate that
> the F5 device isn't
> inspecting client headers and either isn't
> compressing content at all or
> compressing everything depending on how the F5
> behavior works.
>
> Sincerely,
>
> Jay Bivens
>
> On 3/21/05 11:49 AM, "Brian Ott"
> <bott@rapattoni.com> wrote:
>
> > I fixed this by turning off Accept-Encoding, and
> Vary Header. Once
> > *both* were off, everything seemed to work fine.
> >
> > -Brian.
> >
> > -----Original Message-----
> > From: owner-lb-l@vegan.net
> [mailto:owner-lb-l@vegan.net] On Behalf Of
> > Hamie
> > Sent: Saturday, March 19, 2005 3:25 AM
> > To: lb-l@vegan.net
> > Subject: Re: [load balancing] F5 3400 with 9.0.4,
> compression issues
> >
> > Brian Ott wrote:
> >
> >>
> >> We are having compression issues with our 3400.
> Bascially we host about
> >
> >> 50 websites and when we turn on compression we
> find that customers
> >> can't hit the back button on their browser to
> return to the previous
> >> page. Nor can they use javascript calls to go
> back either(as links).
> >> Once we turn off compression everything works
> fine.
> >>
> >> Any ideas? Suggestions as to where to start?
> (Besides F5 support, I am
> >> working with them too)
> >>
> >> The pages are html, some javascript, etc.
> >>
> >>
> >>
> >
> > First thing I'd try is to grab the page (Via
> tcpdump) before & after the
> > compression step & then compare the
> pre-compression page with an
> > uncompressed (But post compression) page.
> >
> > Or simply view source from the browser & see what
> it doesn't like of
> > course... Or wget & save the results & look at
> them.
> >
> >
> > H
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Received on Tue Apr 5 01:45:40 2005

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