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Asked: 2026-05-22T14:32:38+00:00

I’d like to use one resource hierarchy for localhost connections and another resource hierarchy

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I’d like to use one resource hierarchy for localhost connections and another resource hierarchy for all other connections. How would I go about this?

publicSite = Site(File("/var/www/"))
localhostSite = Site(File("/var/localhost/"))

publicServer = TCPServer(80, publicSite, interface="0.0.0.0")
localhostServer = TCPServer(80, localhostSite, interface="127.0.0.1")

It seems that you can’t listen to two different interfaces at the same time.

I get the following error:

Traceback (most recent call last):
File "/usr/bin/twistd", line 21, in <module>
  run()
File "/usr/lib/python2.5/site-packages/twisted/scripts/twistd.py", line 27, in run
  app.run(runApp, ServerOptions)
File "/usr/lib/python2.5/site-packages/twisted/application/app.py", line 379, in run
  runApp(config)
File "/usr/lib/python2.5/site-packages/twisted/scripts/twistd.py", line 23, in runApp
  _SomeApplicationRunner(config).run()
File "/usr/lib/python2.5/site-packages/twisted/application/app.py", line 158, in run
  self.postApplication()
File "/usr/lib/python2.5/site-packages/twisted/scripts/_twistd_unix.py", line 213, in postApplication
  startApplication(self.config, self.application)
File "/usr/lib/python2.5/site-packages/twisted/scripts/_twistd_unix.py", line 174, in startApplication
  service.IService(application).privilegedStartService()
File "/usr/lib/python2.5/site-packages/twisted/application/service.py", line 228, in privilegedStartService
  service.privilegedStartService()
File "/usr/lib/python2.5/site-packages/twisted/application/internet.py", line 68, in privilegedStartService
  self._port = self._getPort()
File "/usr/lib/python2.5/site-packages/twisted/application/internet.py", line 86, in _getPort
  return getattr(reactor, 'listen'+self.method)(*self.args, **self.kwargs)
File "/usr/lib/python2.5/site-packages/twisted/internet/posixbase.py", line 467, in listenTCP
  p.startListening()
File "/usr/lib/python2.5/site-packages/twisted/internet/tcp.py", line 733, in startListening
  raise CannotListenError, (self.interface, self.port, le)
twisted.internet.error.CannotListenError: Couldn't listen on 127.0.0.1:80: (98, 'Address already in use').

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1 Answer

  1. Editorial Team

    Instead of binding to 0.0.0.0 for the second server, bind to one or more public addresses on your server. Twisted doesn’t provide any APIs for enumerating the addresses on a host, nor for differentiating between public and private addresses (because perhaps your “public” address is a 10.x.x.x and a firewall is forwarding traffic from an ”’actually”’ public address).

    If you need to discover your addresses instead of letting them be supplied by configuration, then on POSIX, this ioctl example might help.

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