user www-data;
worker_processes 4;

error_log  /var/log/nginx/error.log;
pid        /var/run/nginx.pid;

events {
  worker_connections  1024;
}

http {
  server_names_hash_max_size 512;
  server_names_hash_bucket_size 128;

  index index.php index.html index.htm;

  include       mime.types;
  default_type  application/octet-stream;

  fastcgi_cache_path  /var/cache/nginx  levels=1:2 keys_zone=WORDPRESS:10m inactive=5m;

  access_log /var/log/nginx/access.log;
  sendfile   on;

  keepalive_timeout  65;

  gzip  on;
  gzip_disable "MSIE [1-6]\.(?!.*SV1)";

  include /etc/nginx/conf.d/*.conf;
  include /etc/nginx/sites-enabled/*;
}

server {
  listen      1.2.3.4:80 default;
  server_name www.mysite.com;

  error_log  /var/log/nginx/www.mysite.com-error.log;
  access_log /var/log/nginx/www.mysite.com-access.log;

  root  /home/graq/sites/www.mysite.com;

 
  location / {
    try_files $uri $uri/ /index.php?q=$uri&$args;
  }

  location ~ \.php$ {
    set $wordpress_logged_in  "";
    set $comment_author_email "";
    set $comment_author       "";

    if ($http_cookie ~* "wordpress_logged_in_[^=]*=([^%]+)%7C") {
      set $wordpress_logged_in wordpress_logged_in_$1;
    }

    if ($http_cookie ~* "comment_author_email_[^=]*=([^;]+)(;|$)") {
      set $comment_author_email comment_author_email_$1;
    }

    if ($http_cookie ~* "comment_author_[^=]*=([^;]+)(;|$)") {
      set $comment_author comment_author_$1;
    }

    set $my_cache_key "$scheme://$host$uri$is_args$args$wordpress_logged_in$comment_author_email$comment_author";

    fastcgi_pass_header     Set-Cookie;
    fastcgi_cache_use_stale error timeout invalid_header http_500;
    fastcgi_cache_key       $my_cache_key;
    fastcgi_cache           WORDPRESS;
    fastcgi_cache_valid     200 1m;

    fastcgi_pass  unix:/usr/local/var/run/php-fpm.sock;
    fastcgi_index index.php;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    fastcgi_param PATH_INFO       $fastcgi_script_name;
    include fastcgi_params;
  }
}

nginx version: nginx/0.8.53
built by gcc 4.4.3 (Ubuntu 4.4.3-4ubuntu5)
TLS SNI support enabled
configure arguments: --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --pid-path=/var/run/nginx.pid --lock-path=/var/lock/nginx.lock --http-log-path=/var/log/nginx/access.log --http-client-body-temp-path=/var/lib/nginx/body --http-proxy-temp-path=/var/lib/nginx/proxy --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --with-debug --with-http_stub_status_module --with-http_flv_module --with-http_ssl_module --with-http_dav_module --with-http_gzip_static_module --with-http_realip_module --with-mail --with-mail_ssl_module --with-ipv6 --add-module=/root/SERVER_BUILD/nginx-0.8.53/gnosek-nginx-upstream-fair-2131c73

server { 
  listen      1.2.3.4:80; 
  server_name www.mysite.com; 

  error_log  /var/log/nginx/www.mysite.com-error.log; 
  access_log /var/log/nginx/www.mysite.com-access.log; 

  root  /home/graq/sites/www.mysite.com; 
  
  location / { 
    try_files $uri $uri/ /index.php?q=$uri&$args; 
  } 

  location ~ \.php$ { 
    fastcgi_pass  unix:/usr/local/var/run/php-fpm.sock; 
    fastcgi_index index.php; 
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; 
    fastcgi_param PATH_INFO       $fastcgi_script_name; 
    include fastcgi_params; 
  } 
} 

phpinfo()
PHP Version => 5.3.3

System => Linux paprika 2.6.32.16-linode28 #1 SMP Sun Jul 25 21:32:42 UTC 2010 i686
Build Date => Nov 16 2010 12:48:36
Configure Command =>  './configure'  '--with-config-file-path=/usr/local/lib/php' '--with-curl' '--enable-exif' '--with-gd' '--with-jpeg-dir' '--with-png-dir' '--with-zlib' '--with-xpm-dir' '--with-freetype-dir' '--with-t1lib' '--with-mcrypt' '--with-mhash' '--with-mysql=mysqlnd' '--with-mysqli=mysqlnd' '--with-pdo-mysql=mysqlnd' '--with-openssl' '--enable-sysvmsg' '--enable-wddx' '--with-xsl' '--enable-zip' '--with-bz2' '--enable-bcmath' '--enable-calendar' '--enable-ftp' '--enable-mbstring' '--enable-soap' '--enable-sockets' '--enable-sqlite-utf8' '--with-gettext' '--enable-shmop' '--with-xmlrpc' '--enable-dba' '--enable-sysvsem' '--enable-sysvshm' '--enable-fpm' '--with-fpm-user=www-data' '--with-fpm-group=www-data'

  location ~ \.php$ {

    set $nocache "";
    if ($http_cookie ~ (comment_author_.*|wordpress_logged_in.*|wp-postpass_.*)) {
      set $nocache "Y";
    }

    fastcgi_pass  unix:/usr/local/var/run/php-fpm.sock;
    fastcgi_index index.php;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    include fastcgi_params;

    fastcgi_cache_use_stale error timeout invalid_header http_500;
    fastcgi_cache_key $host$request_uri;
    fastcgi_cache  WORDPRESS;
    fastcgi_cache_valid 200 1m;
    fastcgi_cache_bypass $nocache;
    fastcgi_no_cache $nocache;
  } 

server{
  .. as above..
  
  ## MU settings - starts
  server_name_in_redirect off;
  port_in_redirect off;

  rewrite ^.*/files/(.*) /wp-includes/ms-files.php?file=$1;
  if (!-e $request_filename) {
   rewrite ^.+?(/wp-.*) $1 last;
   rewrite ^.+?(/.*\.php)$ $1 last;
   rewrite ^ /index.php last;
  }
  ## MU settings - ends

  location / {
    try_files $uri $uri/ /index.php?q=$uri&$args;
  }

  location ~ \.php$ {
    set $nocache "";
    if ($http_cookie ~ (comment_author_.*|wordpress_logged_in.*|wp-postpass_.*)) {
      set $nocache "Y";
    }

    fastcgi_pass  unix:/usr/local/var/run/php-fpm.sock;
    fastcgi_index index.php;
    fastcgi_param CONTENT-LENGTH  $content_length;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    fastcgi_param PATH_INFO       $fastcgi_script_name;
    include fastcgi_params;

    fastcgi_cache_use_stale error timeout invalid_header http_500;
    fastcgi_cache_key       $host$request_uri;
    fastcgi_cache           WORDPRESS;
    fastcgi_cache_valid     200 2m;
    fastcgi_cache_bypass    $nocache;
    fastcgi_no_cache        $nocache;
  }
}

function wp_get_nocache_headers() {
        $headers = array(
                'Expires' => 'Wed, 11 Jan 1984 05:00:00 GMT',
                'Last-Modified' => gmdate( 'D, d M Y H:i:s' ) . ' GMT',
                'Cache-Control' => 'no-cache, must-revalidate, max-age=0',
                'Pragma' => 'no-cache',
        );

        if ( function_exists('apply_filters') ) {
                $headers = apply_filters('nocache_headers', $headers);
        }
        return $headers;
}

fastcgi_ignore_headers Expires Pragma Cache-Control

fastcgi_ignore_headers Expires Pragma Cache-Control

fastcgi_ignore_headers
syntax: fastcgi_ignore_headers name [name...]

context: http, server, location

This directive forbids processing of the named headers from the FastCGI-server reply. It is possible to specify headers like "X-Accel-Redirect", "X-Accel-Expires", "Expires" or "Cache-Control".

fastcgi_ignore_headers Expires Cache-Control;

  location ~ /purge(/.*) {
    access_log off;
    allow               127.0.0.1;
    deny                all;
    fastcgi_cache_purge WORDPRESS $host$1;
  }