Use wsgi.url_scheme instead of ad-hoc CGI checks.
Instead of each place in hgweb_mod that needs to check for SSL or get
the protocol scheme (http vs. https) doing it ad-hoc, make them just
look at the wsgi.url_scheme which because of previous patches is now
always set correctly.
abort: error: Connection refused
255
copy: No such file or directory
abort: HTTP Error 404
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