nginx config (partial) caching reverse proxy example

nginx_partial.conf

# ----------------------------¬
# Proxy config/example
#   (optional config used inside server/location blocks)¬
# context - server, location¬
# link: http://wiki.nginx.org/HttpProxyModule#proxy_cache¬
# link: http://nginx.org/en/docs/http/ngx_http_proxy_module.html¬
# link: http://nginx.org/en/docs/http/ngx_http_upstream_module.html
# link: http://www.packtpub.com/article/using-nginx-reverse-proxy¬
# ----------------------------¬



upstream adappservers {
  # hash on IP for sticky sessions: or least_conn, least_time
  ip_hash;
  server 10.x.x.x max_fails=3 fail_timeout=30s;
  server 10.x.x.x max_fails=3 fail_timeout=30s;
  server 10.x.x.x backup;
}

location / {

  proxy_pass https://adappservers;

  proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
  proxy_redirect off;
  #proxy_buffering off;
  ¬
  proxy_set_header        Host             $host;
  proxy_set_header        X-Real-IP        $remote_addr;
  proxy_set_header        X-Forwarded-For  $proxy_add_x_forwarded_for;
  proxy_set_header        X-Remote-Port    $remote_port;
  proxy_set_header        QUERY_STRING     $query_string;
  ¬
  client_max_body_size    10m;
  client_body_buffer_size 128k;
  proxy_connect_timeout   90;
  proxy_send_timeout      90;
  proxy_read_timeout      90;
  proxy_buffers           32 4k;

  proxy_cache_valid 200 302 90m;
  proxy_cache_valid 404 1m;
  #can include whatever to make cache keys unique (cookie?)¬
  proxy_cache_key $scheme$proxy_host$request_uri;

  # must be hit X times before cached¬
  #proxy_cache_min_uses 1;

  # use cache even if stall, if we get back a timeout, error, etc.
  proxy_cache_use_stale error timeout invalid_header updating http_500 http_502 http_503 http_504 http_404; 

  proxy_ignore_headers X-Accel-Expires Expires Cache-Control Set-Cookie;

}