Rails 3 passenger nginx send_file with x accel redirect and x accel mapping

After a lot of searching as to why range headers were not working despite thinking that I had X-Accel-Redirect configured properly, I realized that I was missing something in my nginx config and so send_file was still sending via rails rather than nginx, causing range headers to fail.

In order to fix this, I had to add a bit more to my nginx config:

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server {
  listen 80;
  server_name example.com;
  root /home/keyvan/example_app/public;
  passenger_enabled on;
  passenger_set_cgi_param HTTP_X_ACCEL_MAPPING /=/sec/;
  passenger_pass_header X-Accel-Redirect;

  location /sec/ {
    alias /;
    internal;
  }
}

Now it works!

http://stackoverflow.com/questions/6237016/message-x-accel-mapping-header-missing-in-nginx-error-log http://airbladesoftware.com/notes/rails-nginx-x-accel-mapping