Unicode filenames with X-Sendfile + Apache

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I struggled to get Unicode filenames to work when serving with X-Sendfile via Apache. (Where it worked in the development server.) This was with Python 2 (and Django 1.11). I haven't tested with later versions.

It turned out that when setting a header on a django.http.HttpResponse object to a Unicode string the value instead became a str object which didn't work well when the response object was later used. It works for me by just changing response['X-Sendfile'] = private_file.full_path (which was a unicode) by adding .encode('utf-8') to the end of it in serve in ApacheXSendFileServer in servers.py.

This is the quick fix for me (except it really wasn't quick :-) which might need embellishing to work with different versions and maybe to check what the actual encoding of filenames should be, but hopefully useful as a start or as something to copy for others with the same problem.