The web server apparently didn't return what was expected. A workaround -
and the solution - is to fix the web server, whatever is wrong.

But still, Mercurial shouldn't crash ... It should probably say something
like 'invalid response'.

I assume the web server can't be accessed from the internet?

Can you use wireshark and capture the request and the response (especially
the headers)?

The following error is produced when doing a clone

hg clone http://myserver/hgwebdir.cgi/media/


destination directory: mediabank
requesting all changes
** unknown exception encountered, details follow
** report bug details to http://mercurial.selenic.com/bts/
** or mercurial@selenic.com
** Mercurial Distributed SCM (version 1.4.2)
** Extensions loaded: win32text, rebase
Traceback (most recent call last):
  File "hg", line 27, in <module>
  File "mercurial\dispatch.pyc", line 16, in run
  File "mercurial\dispatch.pyc", line 30, in dispatch
  File "mercurial\dispatch.pyc", line 46, in _runcatch
  File "mercurial\dispatch.pyc", line 454, in _dispatch
  File "mercurial\dispatch.pyc", line 324, in runcommand
  File "mercurial\dispatch.pyc", line 505, in _runcommand
  File "mercurial\dispatch.pyc", line 459, in checkargs
  File "mercurial\dispatch.pyc", line 453, in <lambda>
  File "mercurial\util.pyc", line 386, in check
  File "mercurial\commands.pyc", line 649, in clone
  File "mercurial\hg.pyc", line 292, in clone
  File "mercurial\localrepo.pyc", line 2140, in clone
  File "mercurial\localrepo.pyc", line 1437, in pull
  File "mercurial\httprepo.pyc", line 200, in changegroupsubset
  File "mercurial\httprepo.pyc", line 102, in do_cmd
  File "rfc822.pyc", line 384, in __getitem__
KeyError: 'content-type'