gistfile1.txt

  location / {
    include /etc/nginx/common/proxy.conf;

    if (-f $document_root/system/cache$uri.html) {
      rewrite ^(.*)$ /system/cache$1.html;
      break;
    }

    if (-f $document_root/system/cache$uri/index.html) {
      rewrite ^(.*)$ /system/cache$1/index.html;
      break;
    }

    if (!-f $request_filename) {
      proxy_pass http://upstream;
      break;
    }
  }