hgweb: also set Content-Type header Our HTTP/WSGI server may convert the Content-Type HTTP request header to the CONTENT_TYPE WSGI environment key and not set HTTP_CONTENT_TYPE. Other WSGI server implementations do this, so I think the behavior is acceptable. So assuming this HTTP request header could get "lost" by the WSGI server, let's restore it on the request object like we do for Content-Length. FWIW, the WSGI server may also *invent* a Content-Type value. The default behavior of Python's RFC 822 message class returns a default media type if Content-Type isn't defined. This is kind of annoying. But RFC 7231 section 3.1.1.5 does say the recipient may assume a media type of application/octet-stream. Python's defaults are for text/plain (given we're using an RFC 822 parser). But whatever. Differential Revision: https://phab.mercurial-scm.org/D2849

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