Sample config to have a Nginx as reverse proxy with a fallback host included

gistfile1.nginxconf

upstream tracker {
    server localhost:81;
    server localhost:82 backup;
}

# HTTP server
server {
  listen 80 default;

	location / {
		proxy_pass http://tracker;
		proxy_set_header Host $http_host;
		proxy_set_header X-Forwarded-Host http_host;
		proxy_set_header X-Real-IP $remote_addr;
		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		proxy_set_header HTTPS "";
		proxy_hide_header Via;
	}
}

# HTTPS server
server {
       listen 443;

       ssl on;
       ssl_certificate cert.pem;
       ssl_certificate_key cert.key;

       ssl_session_timeout 5m;

       ssl_protocols SSLv3 TLSv1;
       ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv3:+EXP;
       ssl_prefer_server_ciphers on;
   
	location / {
		proxy_pass http://tracker;
		proxy_set_header Host $http_host;
		proxy_set_header X-Forwarded-Host $http_host;
		proxy_set_header X-Real-IP $remote_addr;
		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		proxy_set_header HTTPS "on";
		proxy_hide_header Via;
	}
}

# Backup host
server {
       listen 127.0.0.1:82;

       root /usr/share/nginx/www;
       index index.html index.htm;

       location / {
               try_files $uri $uri/ /index.html;
       }
}