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Sure you can. You just need to start a proxy like Grinder's TCP Sniffer on your client machine and change the .NET client and Java client to use "http://localhost:xxxx/foo" instead of "http://codebump.com/services/zipcodelookup.asmx" where xxxx is the port number you configured your proxy to listen.
You'll be able to see exactly what your client is sending over the TCP connection and compare the requests sent by the different clients. [ August 04, 2004: Message edited by: Lasse Koskela ]