Re: http custom Gzip header being stripped on outbound request.
- From: "Michael K. O'Neill" <mikeathon2000@xxxxxxxxxxxxxxxxxx>
- Date: Sun, 18 Sep 2005 10:43:37 -0700
"sameer" <sameer@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:144C9A7C-9A87-4305-8EF3-E06884B3F6E6@xxxxxxxxxxxxxxxx
> Hi All,
> I am adding a custom header (Gzip header for compression) to the request
> when calling a webservice( sitting on a webserver) over the internet from
my
> application ( If interested in the details of the application , it is a
> vb.net winfom application ). The web server receives this request
recognizes
> this custom header, does what it has to do and sends back the data with
the
> custome Gzip header attached. But on some machines while the request is
sent
> from the client to the webserver, this customized header is being stripped
> before reaching the web server.
> Does any body out there know why the outbound request is being stripped
of
> this customized header and how can I make it not do this? I am guess it
might
> be something to do with on of the following
>
> The firewall,
> IE security setting,
> Antivirus
> Popup blockers
>
> Client machines are using IE6 with OS windows 2000, XP.
> Machine which is having this issue is with IE 6.0.2800.1106IC SP1 ,
windows
> 2000 SP4.
>
> Please suggest!
>
The affected machines might be running Norton/Symantec personal firewall or
Symantec Client Firewall (SCF).
Remarkably, the Norton/Symantec firewall changes HTTP headers so it can see
and analyze the response more readily. Reportedly, one change that it makes
(and there are several) is to replace "Accept-Encoding: gzip" in outbound
headers to "--------------: ---". I suppose this makes it easier for the
firewall to analyze the http response for the reason that it does not need
to uncompress a gzip'd response.
See
http://www.newestindustry.org/index.php/2005/03/10/symantec_firewall_problems_with_accept_e
for one report of this behavior. Apparently, the "Internet Security"
component of the firewall makes this change (as well as other changes), so
there's a strong possibility that a wider range of Norton/Symantec products
will exhibit this behavior.
Tell your customers to disable the firewall as a temporary test to confirm
that the firewall is the source of the problem.
Mike
.
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