[PATCH 3 of 4] Fix two small bugs that would've prevented the web interface and IPv6

[Alexis S. L. Carvalho]

Thus spake Eric Hopper:
> # HG changeset patch
> # User Eric Hopper <hopper at omnifarious.org>
> # Node ID 4c41db2ba43b72401a1de57f2499753dababc5bf
> # Parent  cebc99ef27f5918727d821cec2899c8f215481a3
> Fix two small bugs that would've prevented the web interface and IPv6
> from working.
> 
> diff -r cebc99ef27f5 -r 4c41db2ba43b mercurial/hgweb/request.py
> --- a/mercurial/hgweb/request.py	Fri Jun 23 13:03:34 2006 -0700
> +++ b/mercurial/hgweb/request.py	Mon Jun 26 09:21:04 2006 -0700
> @@ -59,7 +59,7 @@ class _wsgirequest(object):
>      def write(self, *things):
>          if self.server_write is None:
>              if not self.headers:
> -                raise RuntimeError("request.write called before headers sent.")
> +                self.header()
>              self.server_write = self.start_response('200 Script output follows',
>                                                      self.headers)
>              self.start_response = None

This change is not enough - self.header() will send a default
"Content-type: text/html" header, ignoring the headers that are embedded
in the template files.

In practice this means that you have a "Content-type: text/html" (from
the template file, not the default sent by header()) at the top of every
regular page (and something a bit worse if you ask for the raw version
of a file).

(BTW, it should be possible to fix issue 254 while fixing this)

Alexis