I remember that there was a library/software you could use to manipulate packages, so When Server B has the text "hello world" on page index.html, it could be changed to "goodbye world" when client A requested the page. While the real index.html still contained the text "hello world" I just don't remember the name!
closed as not constructive by AviD♦ Oct 17 '12 at 15:20
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Is it Airpwn ? http://airpwn.sourceforge.net/Airpwn.html