Currently the application that is passing the X-Accel-Redirect uri back to nginx must set the Content-type header otherwise it will automatically be set to the default_type setting. Is there a way to get nginx to automatically detect the mime settings and transmit it? I've tried: fastcgi_ignore_headers Content-Type, but that gave me the error (taken from http://serverfault.com/questions/195060/nginx-x-accel-redirect-and-mime-types):

[warn] 3988#1288: invalid value "Content-Type"

Note: I'm using the latest windows build to test on.