tshark is the command line version of wireshare. Because I do this a lot, here is an example of syntax. tshark -f "dst port 80" -R "http.request" -w request

This will capture all http requests on port 80 and save them to file ./request
The request that you are having problems with should be different, because if two browsers are generating the same request to a server, then they should receive the same result. (unless this is a contrived example)

You can run the test with IE to see the request it generates using IES4Linux (as a side note you can do some awesome stuff by exporting to PDML or libpcap and parsing with perl)