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Squid Proxy 400 Bad Request with client application using Web Services

Posted on 2006-11-01
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Last Modified: 2010-05-18
Hi There guys. Here's my problem. Our rich client java application uses web services to communicate to our web server. At one of our clients, they run a squid proxy on Linux. When a web service gets called, it seems that the squid proxy returns a error message 'Error 400 - Bad Request'. I did some digging around, and found that the squid proxy does not handle relative url's, but only absolute url's, and that's the reason for the apparent 'Error 400'. Seeing that we cannot change our application at this point, is there a way to configure squid to ignore this? Maybe some other work-around suggestion?

thanks alot,
Martin Coetzee
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Question by:DaBump
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Paracelsius earned 500 total points
ID: 17912912
Hi Martin

If squid is used at your clients site as forwarding proxy (like in most common cases) you would have no better option than to rewrite the java app.

Squid expects to have a full URL, so that it know where to connect. Using relative URLs in the html documents is another story, since the browsers will use them to build an absolute URL (not URI)  to connect to the service.

If have access to the clients squid config you could setup a rule to use squid as accelerator (reverse proxy) for your application. But I suppose this would be overkill if you have multiple client.

In my opinion, you cannot get around rewriting the app.

HTH,
pC
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Author Comment

by:DaBump
ID: 17913353
Hi Paracelsius, thanks for the comment. What we ended up doing was to change the firewall rules to forward all calls to our domain straight out, instead of passing through the proxy server. This worked. I will need to make changes to our application to handle proxy servers for future problems. Thanks for the help, here's 500 points for you ;)

Cheers
Martin
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Expert Comment

by:Paracelsius
ID: 17913584
Hi Martin

Thanks a lot.

Indeed instead of using an application layer gateway (squid) you can forward the packets using DNAT to the server.

Best regards,
pC
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