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if `request.META["HTTP_USER_AGENT"]` is not set the fallback value should an empty string instead of None
or else we get a `TypeError: argument of type 'NoneType' is not iterable` on `if 'WebKit' in user_agent:`

Now I raise a django builtin permission denied instead of writing a custom HttpResponse

otherwise the coverage env is missing these dependencies

This is not implemented using a `def head()` in the view, as the HEAD request
should return all headers that the GET request would send. Hence,
updated the server logic to provide a proper HEAD request.

Fix spelling error

 Support X-Accel-Redirect quoting in nginx >=1.5.9

This assumes most people are on nginx versions newer than 1.5.9

Newer versions of nginx require a properly encoded URI in the X-Accel-Redirected response. According to research done by people on the django-sendfile issue tracker, the specific version number seems to be 1.5.9.

The ``PRIVATE_STORAGE_NGINX_VERSION`` setting is used to determine the proper encoding (defaults to current behaviour of not quoting).

https://github.com/adnrs96/django-sendfile/commit/4488e520f04661136e88be38281e789ae50a260c

Renamed test paths for uniqueness.
Show which files do exist in the folder.