91ac1726730a breaks pull here
(because remote doesn't provide connection.sendall?):

pulling from http://selenic.com/repo/hg
** unknown exception encountered, details follow
** report bug details to http://www.selenic.com/mercurial/bts
** or mercurial@selenic.com
** Mercurial Distributed SCM (version 5f404dc8acd0)
Traceback (most recent call last):
  File "/usr/local/bin/hg", line 20, in <module>
    mercurial.dispatch.run()
  File "/usr/local/lib/python2.5/site-packages/mercurial/dispatch.py", line 20, in run
    sys.exit(dispatch(sys.argv[1:]))
  File "/usr/local/lib/python2.5/site-packages/mercurial/dispatch.py", line 29, in dispatch
    return _runcatch(u, args)
  File "/usr/local/lib/python2.5/site-packages/mercurial/dispatch.py", line 45, in _runcatch
    return _dispatch(ui, args)
  File "/usr/local/lib/python2.5/site-packages/mercurial/dispatch.py", line 364, in _dispatch
    ret = _runcommand(ui, options, cmd, d)
  File "/usr/local/lib/python2.5/site-packages/mercurial/dispatch.py", line 417, in _runcommand
    return checkargs()
  File "/usr/local/lib/python2.5/site-packages/mercurial/dispatch.py", line 373, in checkargs
    return cmdfunc()
  File "/usr/local/lib/python2.5/site-packages/mercurial/dispatch.py", line 356, in <lambda>
    d = lambda: func(ui, repo, *args, **cmdoptions)
  File "/usr/local/lib/python2.5/site-packages/mercurial/commands.py", line 2034, in pull
    modheads = repo.pull(other, heads=revs, force=opts['force'])
  File "/usr/local/lib/python2.5/site-packages/mercurial/localrepo.py", line 1455, in pull
    fetch = self.findincoming(remote, heads=heads, force=force)
  File "/usr/local/lib/python2.5/site-packages/mercurial/localrepo.py", line 1288, in findincoming
    heads = remote.heads()
  File "/usr/local/lib/python2.5/site-packages/mercurial/httprepo.py", line 367, in heads
    d = self.do_read("heads")
  File "/usr/local/lib/python2.5/site-packages/mercurial/httprepo.py", line 351, in do_read
    fp = self.do_cmd(cmd, **args)
  File "/usr/local/lib/python2.5/site-packages/mercurial/httprepo.py", line 305, in do_cmd
    resp = urllib2.urlopen(request(cu, data, headers))
  File "/usr/local/lib/python2.5/urllib2.py", line 121, in urlopen
    return _opener.open(url, data)
  File "/usr/local/lib/python2.5/urllib2.py", line 374, in open
    response = self._open(req, data)
  File "/usr/local/lib/python2.5/urllib2.py", line 392, in _open
    '_open', req)
  File "/usr/local/lib/python2.5/urllib2.py", line 353, in _call_chain
    result = func(*args)
  File "/usr/local/lib/python2.5/site-packages/mercurial/httprepo.py", line 108, in http_open
    return self.do_open(httpconnection, req)
  File "/usr/local/lib/python2.5/site-packages/mercurial/keepalive.py", line 241, in do_open
    self._start_transaction(h, req)
  File "/usr/local/lib/python2.5/site-packages/mercurial/keepalive.py", line 313, in _start_transaction
    h.request(req.get_method(), req.get_selector(), body, headers)
  File "/usr/local/lib/python2.5/httplib.py", line 862, in request
    self._send_request(method, url, body, headers)
  File "/usr/local/lib/python2.5/httplib.py", line 885, in _send_request
    self.endheaders()
  File "/usr/local/lib/python2.5/httplib.py", line 856, in endheaders
    self._send_output()
  File "/usr/local/lib/python2.5/httplib.py", line 728, in _send_output
    self.send(msg)
  File "/usr/local/lib/python2.5/site-packages/mercurial/httprepo.py", line 99, in _sendfile
    connection.sendall(self, data)
AttributeError: class HTTPConnection has no attribute 'sendall'