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bind('') does not do the same as bind('localhost')

This commit is contained in:
Georg Brandl 2013-04-14 10:59:04 +02:00
parent 5f4b4ac73e
commit a204636b91
1 changed files with 5 additions and 3 deletions
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8
Doc/howto/sockets.rst
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@ -84,9 +84,11 @@ creates a "server socket"::
serversocket.listen(5)
A couple things to notice: we used ``socket.gethostname()`` so that the socket
would be visible to the outside world. If we had used ``s.bind(('', 80))`` or
``s.bind(('localhost', 80))`` or ``s.bind(('127.0.0.1', 80))`` we would still
have a "server" socket, but one that was only visible within the same machine.
would be visible to the outside world. If we had used ``s.bind(('localhost',
80))`` or ``s.bind(('127.0.0.1', 80))`` we would still have a "server" socket,
but one that was only visible within the same machine. ``s.bind(('', 80))``
specifies that the socket is reachable by any address the machine happens to
have.
A second thing to note: low number ports are usually reserved for "well known"
services (HTTP, SNMP etc). If you're playing around, use a nice high number (4