Re: Re: direct connection works, proxy does not.

OK, I used CGI to parse the form:

use CGI;
$query = new CGI;
$one = $query->param('one');
$two = $query->param('two');


if ($one) {&one; }
elsif ($two) {&two; }
else {&three; }
[download]

Again, it works fine with a direct connection to the Net (performing &one or &two as necessary), but branches to &three when accessed through a proxy as if $one and $two where none existant.

Any ideas?

Comment on Re: Re: direct connection works, proxy does not. Download Code

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Re: Re: Re: direct connection works, proxy does not. by BlueLines (Hermit) on Feb 03, 2001 at 03:45 UTC
I have several ideas. I work for a company that makes transparent proxy software. Microsoft's proxy products don't behave in the manner that other proxies do. When we have issues with our proxy breaking things, we sniff the network and watch the request come though. Some proxies are extremely sensitive to HTTP requests, and require special formatting of HTTP headers to work correctly. For instance, here's a typical HTTP request from an average program: `GET www.google.com/index.html HTTP/1.0` [download] This code will fail on most proxies because proxies require an additional header. So the following request will work on most proxies: `GET /index.html HTTP/1.0 Host: www.google.com` [download] Now this works on virtually every proxy. Except WinProxy. WinProxy requires an additional header, as well as browser identification, so the same request would look like this: `GET / HTTP/1.0 Host: www.google.com User-agent: Mozilla/4.7 Remote-Host-Wp: 10.0.3.82` [download] Aparently the session management part of WinProxy is severely lacking. So the point to all of this is that writing to WinProxy is extremely difficult (do a query for "WinProxy" in Mozilla's bug tracking database, and see how WinProxy breaks everything). My suggestion is to sniff the request, figure out where the proxy is dying, and use LWP::UserAgent to fake the headers WinProxy requires. Sorry for the rant :-) BlueLines Disclaimer: This post may contain inaccurate information, be habit forming, cause atomic warfare between peaceful countries, speed up male pattern baldness, interfere with your cable reception, exile you from certain third world countries, ruin your marriage, and generally spoil your day. No batteries included, no strings attached, your mileage may vary.	[reply] [d/l] [select]
OT: I'm glad you ranted by footpad (Abbot) on Feb 03, 2001 at 09:03 UTC
Since I'm playing with and trying to learn these type of things, do the extra headers have any side effects in the proxies that don't require them? Also, I notice that you're using HTTP 1.0, instead of 1.1. Is this significant? --f	[reply]