[squid-users] invalid request

I get this error acessing www.intellicast.com:

ERROR

The requested URL could not be retrieved

While trying to process the request:

GET http://ad.doubleclick.net/adj/intellicast.dart/intellicasthome;abr=!ie;seg=homepage;adpos=2;sz=125x125;tile=1;ord
=1131 HTTP/1.0
Proxy-Connection: Keep-Alive
User-Agent: Mozilla/4.72 [en] (Windows NT 5.0; U)
Pragma: no-cache
Host: ad.doubleclick.net
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png, */*
Accept-Encoding: gzip
Accept-Language: en
Accept-Charset: iso-8859-1,*,utf-8
Proxy-authorization: Basic Y2hhcGFuOm5ld3lvcms=
Cookie: id=8000000551148e2

The following error was encountered:

     Invalid Request

Some aspect of the HTTP Request is invalid. Possible problems:

     Missing or unknown request method
     Missing URL
     Missing HTTP Identifier (HTTP/1.0)
     Request is too large
     Content-Length missing for POST or PUT requests
     Illegal character in hostname; underscores are not allowed

Your cache administrator is chapan@ci.mil.wi.us.

Generated Thu, 12 Apr 2001 16:01:28 GMT by isdbsd1.ci.mil.wi.us (Squid/2.4.STABLE1)
Received on Thu Apr 12 2001 - 10:02:58 MDT