[Bug 1604608] Re: ipv6 client causes errors in twisted.web

[Alberto Donato]

This is still an issue in 17.9.0-2ubuntu0.1 in bionic

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Title:
  ipv6 client causes errors in twisted.web

Status in twisted package in Ubuntu:
  New

Bug description:
  If the client connecting to the twisted (16.0.0-1, still present in upstream 16.3.0), then twisted dies as follows:
  2016-07-18 15:40:21 [HTTPChannel,468,::ffff:127.0.0.1] Unhandled Error
          Traceback (most recent call last):
            File "/usr/lib/python3/dist-packages/twisted/web/http.py", line 1657, in lineReceived
              self.allContentReceived()
            File "/usr/lib/python3/dist-packages/twisted/web/http.py", line 1736, in allContentReceived
              req.requestReceived(command, path, version)
            File "/usr/lib/python3/dist-packages/maasserver/webapp.py", line 80, in requestReceived
              command, path, version)
            File "/usr/lib/python3/dist-packages/twisted/web/http.py", line 762, in requestReceived
              self.process()
          --- <exception caught here> ---
            File "/usr/lib/python3/dist-packages/twisted/web/server.py", line 183, in process
              self.render(resrc)
            File "/usr/lib/python3/dist-packages/twisted/web/server.py", line 234, in render
              body = resrc.render(self)
            File "/usr/lib/python3/dist-packages/twisted/web/wsgi.py", line 561, in render
              self._reactor, self._threadpool, self._application, request)
            File "/usr/lib/python3/dist-packages/twisted/web/wsgi.py", line 293, in __init__
              'REMOTE_ADDR': _wsgiString(request.getClientIP()),
            File "/usr/lib/python3/dist-packages/twisted/web/wsgi.py", line 85, in _wsgiString
              return string.decode("iso-8859-1")
          builtins.AttributeError: 'NoneType' object has no attribute 'decode'

  In the attached patch, the middle block addresses the above immediate
  issue, and the other two blocks are my best guess at what the code
  _should_ read for completeness.

  We'll want to get this SRUed into xenial, once it's fixed in wily, as
  it's required for MAAS 2.1 (which runs on "latest LTS release" ==
  xenial.)

  thanks

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