[PLUG] Content Encoding Error

Derek Loree drl at drloree.com
Thu Apr 30 03:26:05 UTC 2009


On Wed, 2009-04-29 at 01:33 -0700, drew wymore wrote:
> On Wed, Apr 29, 2009 at 1:09 AM, Derek Loree <drl at drloree.com> wrote:
> 
> > On Wed, 2009-04-29 at 01:04 -0700, drew wymore wrote:
> > > On Wed, Apr 29, 2009 at 12:58 AM, Derek Loree <drl at drloree.com> wrote:
> > >
> > > > Hi All,
> > > >
> > > > I've got a problem that I hope you all can help me with.
> > > >
> > > > The goal: A content filtering proxy server for a small number of users
> > > > that don't need to pay for the service, no need for a captive portal.
> > > > Log file display or conveyance has been requested.
> > > >
> > > > Current setup:  Puppy Linux setup with the devx pup, manual installs of
> > > > dualserver (for DHCP and DNS), tinyproxy and dansguardian.  A firewall
> > > > rule to redirect port 80 to 8080 (where dansguardian is listening) to
> > > > make it a transparent proxy.  Another to block the port that tinyproxy
> > > > is listening on.
> > > >
> > > > Using my laptop as a test client, everything works as advertised until
> > I
> > > > point my browser at the Awstats home page (looking for a log display
> > > > solution).  The error that I get with Firefox in Windows and most
> > > > browsers in linux is "Content Encoding Error" and some verbage about an
> > > > incompatible compression scheme.  IE, of course, only gives the usual
> > > > "Page cannot be displayed" error.  If I by-pass dansguardian by turning
> > > > on the proxy setting in the browser and pointing it at tinyproxy, I can
> > > > see the awstat web site.  So, the cause of the error is dansguardian,
> > > > however, the error is not generated by dansguardian.  It is generated
> > by
> > > > the browser.  The log files do not say anything about any problems, all
> > > > is normal according to them.
> > > >
> > > > The only clue I found had to do with zlib encoding, so I rebuilt
> > > > dansguardian with the --with-zlib-static switch so that the zlib
> > library
> > > > would be statically linked.  No change.  I tried changing all kinds of
> > > > configuration options.  No change.  I downloaded the source code for
> > > > zlib and installed it.  No change.  I rebuilt dansguardian, again.  No
> > > > change.
> > > >
> > > > I feel like I'm missing something, mainly because this does not seem to
> > > > have stumped very many people, and dansguardian is not the only cause.
> > > > The disheartening part is that the pleas for help went unanswered.
> > > >
> > > > Now I am crying for help, please help with any clues you might have.
> > > >
> > > > Thank you sincerely,
> > > >
> > > > --
> > > > Derek Loree <drl at drloree.com>
> > > >
> > > > _______________________________________________
> > > > PLUG mailing list
> > > > PLUG at lists.pdxlinux.org
> > > > http://lists.pdxlinux.org/mailman/listinfo/plug
> > > >
> > >
> > > I assume awstats is hosted on a local webserver? Perhaps disabling
> > content
> > > compression support in Apache might do the trick.
> > >
> > No, I meant the real website: http://awstats.sourceforge.net/
> >
> > > Drew-
> > > _______________________________________________
> > > PLUG mailing list
> > > PLUG at lists.pdxlinux.org
> > > http://lists.pdxlinux.org/mailman/listinfo/plug
> > --
> > Derek Loree <drl at drloree.com>
> > Loree Consulting
> >
> > _______________________________________________
> > PLUG mailing list
> > PLUG at lists.pdxlinux.org
> > http://lists.pdxlinux.org/mailman/listinfo/plug
> >
> 
> Ah my bad, thanks for the clarification.
> 
> Maybe try turning off encoding support on your test client assuming Firefox
> and see what happens.
> 
> http://kb.mozillazine.org/Network.http.accept-encoding#Possible_values_and_their_effects
> 
> According to www.netcraft.com sourceforge.net is running a F5 Big-IP:
> http://www.f5.com/products/big-ip/ which has its own built in webserver.
> I've found some config files floating around for the webserver running on it
> and maybe it's sending some weird content compression encoding that doesn't
> involve gzip || deflate which seem to be the default accepted values in
> Firefox. Maybe they're sending compress instead and it needs to be added.
> The Firebug add-on for Firefox will show you the headers being sent by the
> server.

Is it possible that dansguardian is changing this, because I don't have
to modify Firefox to render the page when it doesn't go through
dansguardian?
> 
> Hope that helps,
> Drew-
> _______________________________________________
> PLUG mailing list
> PLUG at lists.pdxlinux.org
> http://lists.pdxlinux.org/mailman/listinfo/plug
-- 
Derek Loree <drl at drloree.com>
Loree Consulting




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