node.js upstream nginx config

nginx.conf

 http {
    proxy_cache_path  /var/cache/nginx levels=1:2 keys_zone=one:8m max_size=3000m inactive=600m;
    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;
 
    ssl_certificate /some/location/sillyfacesociety.com.bundle.crt;
    ssl_certificate_key /some/location/sillyfacesociety.com.key;
    ssl_protocols        SSLv3 TLSv1;
    ssl_ciphers HIGH:!aNULL:!MD5;

    upstream silly_face_society_upstream {
      server 127.0.0.1:61337;
      server 127.0.0.1:61338;
      keepalive 64;
    }

    server {
      listen 80;
      listen 443 ssl;

      server_name sillyfacesociety.com;
      return 301 $scheme://www.sillyfacesociety.com$request_uri;
    }

    server {
        listen 80;
        listen 443 ssl;

        server_name www.sillyfacesociety.com;

        error_page 502  /errors/502.html;

        location ~ ^/(images/|img/|javascript/|js/|css/|stylesheets/|flash/|media/|static/|robots.txt|humans.txt|favicon.ico) {
          root /usr/local/silly_face_society/node/public;
          access_log off;
          expires max;
        }

        location /errors {
          internal;
          alias /usr/local/silly_face_society/node/public/errors;
        }

        location / {
          proxy_redirect off;
          proxy_set_header   X-Real-IP            $remote_addr;
          proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
          proxy_set_header   X-Forwarded-Proto $scheme;
          proxy_set_header   Host                   $http_host;
          proxy_set_header   X-NginX-Proxy    true;
          proxy_set_header   Connection "";
          proxy_http_version 1.1;
          proxy_cache one;
          proxy_cache_key sfs$request_uri$scheme;
          proxy_pass         http://silly_face_society_upstream;
        }
    }
}

Well, to answer my own question:
In the location / block in this example, you can add this line:

add_header X-Cache-Status $upstream_cache_status;

which will output if it's a HIT, MISS, or EXPIRED in the X-Cache-Status header. Source: http://serverfault.com/questions/434915/nginix-proxy-caching-how-to-check-if-it-is-working

Nginx's caching behavior seems to respect other caching configuration you have on that resource, for example, if you have a Cache-Control: no-cache header, Nginx won't cache it and that header's value will always be MISS.

gzip_types text/html

Will generally throw an error as its included by default.

I've just installed nginx, and am following your tutorial on how to use nginx to avoid node.js load

Is this gist meant to replace the entire default nginx.conf or just the sections of it that the gist includes?