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Wireshark is good, but it doesn't allow you to change the content of the packet.

Is there a tool to do this job?

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This StackOverflow question may be helpful: stackoverflow.com/questions/260757/… –  Trey Hunner May 11 '10 at 5:04
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2 Answers

Try fiddler

From http://www.fiddler2.com/fiddler2/ - "Fiddler is a Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet. Fiddler allows you to inspect all HTTP(S) traffic, set breakpoints, and "fiddle" with incoming or outgoing data."

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Does it allows you to modify the data? –  fms May 11 '10 at 3:36
    
Yes, you can change the data. Here are some examples: fiddler2.com/Fiddler/Dev/ScriptSamples.asp –  dsolimano May 11 '10 at 12:15
    
It modified the data within a browser,how to do it without involving a browser? –  fms Sep 13 '10 at 13:25
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There's a Firefox addon called TamperData that can accomplish this.

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