upstream dillinger {
    server dillinger1:80;
    server dillinger2:80;
    server dillinger3:80;
    server dillinger4:80;
}

server {
    proxy_temp_path /var/tmp;
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;

    gzip on;
    gzip_comp_level 6;
    gzip_vary on;
    gzip_min_length  1000;
    gzip_proxied any;
    gzip_types text/plain text/html text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
    gzip_buffers 16 8k;

    listen 80;
    server_name www.dillinger.io dillinger.io;

    access_log  /var/log/nginx/nginx.access.dillinger.log;
    error_log  /var/log/nginx/nginx_error.dillinger.log debug;

    # Serve static assets with nginx, not N|Solid
    location ~ ^/(images/|img/|javascript/|js/|css/|stylesheets/|flash/|media/|static/|robots.txt|humans.txt|favicon.ico) {
        root /var/sites/dillinger/public;
        access_log off;
        expires max;
    }

    location / {
        proxy_redirect off;
        proxy_pass http://dillinger; # Load balance the URL location "/" to the upstream dillinger
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }

    error_page   500 502 503 504  /50x.html;

    location = /50x.html {
        root   /var/www/nginx-default;
    }

}