Should squid be choking on this?

I was trying to browse some software at www.pilotgear.com and got this:

While trying to retrieve the URL:
http://www.pilotgear.com/software/showsoftware.html?url_sku=199810270824192736&url_btitle=&url_bdescription=contact
manager&cart=3003638126441218

The following error was encountered:

     Invalid URL

Some aspect of the requested URL is incorrect. Possible problems:

     Missing or incorrect access protocol (should be `http://'' or similar)
     Missing hostname
     Illegal double-escape in the URL-Path
     Illegal character in hostname; underscores are not allowed

Generated Sun, 07 Mar 1999 23:05:23 GMT by squid.shreve.net (Squid/2.1.PATCH2)

Now If I don't go thru squid, I am ok, and retrieve the url. I don't
think my squid is out of date, does anyone know how I can fix this?

-----------------------------------------------------
Brian Feeny (BF304) signal@shreve.net
318-222-2638 x 109 http://www.shreve.net/~signal
Network Administrator ShreveNet Inc. (ASN 11881)
Received on Sun Mar 07 1999 - 15:43:55 MST