WP multisite server block nginx with fastcgi cache and backend bypass

FastCGI caching directives
fastcgi_cache_path /etc/nginx/cache levels=1:2 keys_zone=WORDPRESS:30m inactive=30m;
fastcgi_cache_key "$scheme$request_method$host$request_uri";
fastcgi_cache_lock on;
fastcgi_cache_use_stale error timeout invalid_header http_500;
fastcgi_cache_valid 5m;
fastcgi_ignore_headers Cache-Control Expires Set-Cookie;

server {
        ##DM - uncomment following line for domain mapping      
        #listen 80 default_server;
        server_name example.com;
        ##DM - uncomment following line for domain mapping
        #server_name_in_redirect off;

        access_log   /var/log/nginx/example.com.access.log;
        error_log    /var/log/nginx/example.com.error.log;

        root /var/www/vhosts/example/production;
        index index.php;

        if (!-e $request_filename) {
                rewrite /wp-admin$ $scheme://$host$uri/ permanent;

                rewrite ^(/[^/]+)?(/wp-.*) /wp/$2 last;
                rewrite ^(/[^/]+)?(/.*\.php) /wp/$2 last;
        }

        set $no_cache 0;
        set $why 'huh';

        if ($request_method = POST)
        {
                set $no_cache 1;
                set $why $request_method;


        }
        if ($request_uri ~* "/(wp-admin/|wp-login.php)")
        {
                set $no_cache 1;
                set $why $request_uri;
        }
        if ($http_cookie ~* "wordpress_logged_in_")
        {
                set $no_cache 1;
                set $why $http_cookie;
        }

        if ($request_method !~ ^(GET|POST|HEAD)$ ) {
                return 444;
                set $why $request_method;
        }

        if ($query_string != "")
        {
                set $no_cache 1;

        }
        if ($request_uri ~* "(/wp-admin/|/xmlrpc.php|/wp-(app|cron|login|register|mail).php|wp-.*.php|/feed/|index.php|wp-comments-popup.php|wp-links-opml.php|wp-locations.php|sitemap(_index)?.xml|[a-z0-9_-]+-sitemap([0-9]+)?.xml)") {

                set $no_cache 1;
                set $why $request_uri;
        }

        include /etc/nginx/fastcgi_params;

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

        location ~ \.php$ {

                fastcgi_index index.php;
                try_files $uri =404;
                #fastcgi_pass 127.0.0.1:9000;
                fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_split_path_info ^(.+\.php)(/.+)$;

                add_header X-Cache $upstream_cache_status;
                add_header no-X-Cache $no_cache;
                add_header X-Cache-why $why;

                fastcgi_cache_bypass $no_cache;
                fastcgi_no_cache $no_cache;

                fastcgi_cache WORDPRESS;

        }

        location ~ /purge(/.*) {

                if ($no_cache != 1){
                        return 403;
                }

                fastcgi_cache_purge WORDPRESS "$scheme$request_method$host$1";

        }

        location ~* ^.+\.(ogg|ogv|svg|svgz|eot|otf|woff|mp4|ttf|rss|atom|jpg|jpeg|gif|png|ico|zip|tgz|gz|rar|bz2|doc|xls|exe|ppt|tar|mid|midi|wav|bmp|rtf)$ {
                access_log off; log_not_found off; expires max;
        }

        location = /robots.txt { access_log off; log_not_found off; }
        location ~ /\. { deny  all; access_log off; log_not_found off; }


        server_tokens off;
        server_name_in_redirect off;

}
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