My location block in nginx is below.

upstream unicorn_app {
server 192.111.111.111:8080 fail_timeout=0;
}

# https SSL SPDY vhost
server {
    listen 443 ssl spdy;
        server_name test.com www.test.com;


location / {
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_redirect off;
proxy_pass http://unicorn_app;
proxy_set_header X-Forwarded-Proto https;