"We've elected to have our port scan start at 80 (The
traditional http server port) and grab every other (higher)
listening port on the localhost and query all of them, as if they
were http servers, by sending a simple HTTP/1.0 GET request. As a
blanket request to any number of known, and unknown, ports, it's
not always the best way to interrogate, but it does get lots of
useful information from any sort of web server and a few other
sorts of servers as well. The only thing you have to settle down
and be comfortable with is the fact that, a lot of the time, you
can find out just as much about what's running on a particular port
by reading the error message you receive from a bogus query as you
can from reading the result of a successful one."
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