nginx config for reverse proxying Wordpress & WP Super Cache and keeping the load off Apache2

server {
  listen 80;
  server_name **DOMAIN_HERE**;
  access_log /var/log/nginx/access.**DOMAIN_HERE**.log;

  gzip on;
  gzip_disable msie6; # disable gzip for IE6
  gzip_static on;
  gzip_comp_level 9; # highest level of compression
  gzip_proxied any;
  gzip_types text/plain text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript;

  proxy_redirect 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_pass_header Set-Cookie;root **/PATH/TO/WORDPRESS**;

  # default location, used for the basic proxying
  location / {
    # if we're requesting a file and it exists, return it and bail out
    if (-f $request_filename) {
      break;
    }

    client_max_body_size 2m; # increase this to increase file upload size
    proxy_pass https://localhost:**APACHE_PORT**;
  }

  # handle uploaded files
  location ~* files/ {
    root **/PATH/TO/WORDPRESS**/blogs.dir/**BLOG_ID**/;
  }

  # handle static files
  location ~* \.(jpg|png|gif|jpeg|js|css|mp3|wav|swf|mov|doc|pdf|xls|ppt|docx|pptx|xlsx|txt|htm|html)$ {
    # if the static file doesn't exist, handle it with Apache
    if (!-f $request_filename) {
    break;
    proxy_pass https://localhost:**APACHE_PORT**;
  }

  }

  set $supercache_file "";
  set $supercache_uri $request_uri;

  # reset cache URI if POSTing - bypass cache
  if ($request_method = POST) {
    set $supercache_uri "";
  }

  # bypass cache if there's a query string
  if ($query_string) {
    set $supercache_uri "";
  }

  # bypass cache if one of the cookies below is set
  if ($http_cookie ~* "comment_author_|wordpress|wp-postpass_") {
    set $supercache_uri "";
  }

  # if the URI is still set (rules above don't trigger) then set our file location!
  if ($supercache_uri ~ ^(.+)$) {
    set $supercache_file /wp-content/cache/supercache/$http_host$1index.html;
  }

  # rewrite the request to the cached HTML file
  if (-f $document_root$supercache_file) {
    rewrite ^(.*)$ $supercache_file break;
  }

  # if file exists, return it - will bypass back to Apache if not
  if (-f $request_filename) {
    break;
  }
}