nginx alias redirect with trailing slash using different host name -

I have the following nginx config that is servering some static pages. It sits behind a load balancer and is not listening to the public host name. The problem with the bottom nginx sends back a 301 to add a previous slash, but it sets the location in the interior. Mysite.production / blog / not www.mysite.com/blog/

  server {80 says; Server_name internal.mysite.production location / blog {root / var / www / somewhere /; }}   
 Is there any alternative to change this?   
 
 
 You can specify:  
  server_name_in_redirect on; See also   
 in your NGN config: