nginx to gunicorn proxy.

appname.conf

upstream appname {
 #server unix:/tmp/gunicorn.sock fail_timeout=0;
 # For a TCP configuration:
 server 127.0.0.1:5000 fail_timeout=0;
}
server {
       listen 80;
       server_name www.appname.com;
       rewrite ^ https://$server_name$request_uri? permanent;
}
server {
 listen 443 ssl;

 client_max_body_size 4G;
 server_name www.appname.com;

 keepalive_timeout 300;

 ssl_certificate /opt/appname/appname.com.chained.crt;
 ssl_certificate_key /opt/appname/appname.com.key;
 ssl_protocols SSLv3 TLSv1 TLSv1.1 TLSv1.2;
 ssl_ciphers HIGH:!aNULL:!MD5;
 # path for static files
 root /opt/appname/nginx-static;

 location / {
     # checks for static file, if not found proxy to app
     try_files $uri @proxy_to_app;
 }
 location @proxy_to_app {
     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
     proxy_set_header Host $http_host;
     proxy_redirect off;

     proxy_pass http://appname;
 }

 error_page 500 502 503 504 /500.html;
 location = /500.html {
     root /opt/appname/nginx-static;
 }
}