Nginx Node.js Proxy with caching, websockets, gzip

the-scratch.conf

proxy_cache_path  /var/cache/nginx/cache levels=1:2 keys_zone=cache:8m max_size=3000m inactive=600m;
proxy_temp_path /var/tmp;

# the IP(s) on which your node server is running. I chose port 3000.
upstream app_the_scratch {
    server 127.0.0.1:3000 weight=1 fail_timeout=60s;
}

# the nginx server instance
server {
    listen 0.0.0.0:80;
    server_name the-scratch.no-ip.org;
    access_log /var/log/nginx/the-scratch.no-ip.org.log;

    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;

    # pass the request to the node.js server with te correct headers and much more can be added, see nginx config options
    location / {
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header Host $http_host;
      proxy_set_header X-NginX-Proxy true;

      # socket.io stuff
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";

      # Pass to upstream
      proxy_pass http://app_the_scratch/;
      proxy_redirect off;

      proxy_cache cache;
      proxy_cache_valid 200 1d;
      proxy_cache_use_stale  error timeout invalid_header updating http_500 http_502 http_503 http_504;

      proxy_cache_bypass $http_upgrade;
    }
 }