Noticed improper `Content-Type` header when accessing download url of private repository: ``` $ curl -i https://gitlab.com/glensc/private/repository/archive.tar.gz?ref=master HTTP/1.1 401 Unauthorized Server: nginx Date: Fri, 11 Nov 2016 16:24:07 GMT Content-Type: #<Mime::NullType:0x007f298a909510>; charset=utf-8 Content-Length: 49 Cache-Control: no-cache X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN X-Request-Id: 72b3e532-15cb-4e6e-a2f9-73d1456050e7 X-Runtime: 0.056089 X-Xss-Protection: 1; mode=block You need to sign in or sign up before continuing. ```