woo-commerce fastcgi-cache session-conflict solution (attempt)

woo-nginx.conf

# WPSINGLE BASIC NGINX CONFIGURATION
server {

	server_name woo.rtcamp.net www.woo.rtcamp.net;

	access_log   /var/log/nginx/woo.rtcamp.net.access.log rt_cache;
	error_log    /var/log/nginx/woo.rtcamp.net.error.log debug;

	root /var/www/woo.rtcamp.net/htdocs;
	index index.php index.htm index.html;

	fastcgi_cache_use_stale error timeout invalid_header http_500;

	set $skip_cache 0;

	# POST requests and urls with a query string should always go to PHP
	if ($request_method = POST) {
		set $skip_cache 1;
	}   
	if ($query_string != "") {
		set $skip_cache 1;
	}   

	if ( $cookie_woocommerce_items_in_cart = "1" ){
		 set $skip_cache 1;
	}

	# Don't cache uris containing the following segments
	if ($request_uri ~* "(/shop.*|/loja.*|/cart.*|/carrinho.*|/my-account.*|/minha-conta.*|/checkout.*|/finalizar-compra.*|/addons.*|/wp-admin/|/xmlrpc.php|wp-.*.php|/feed/|index.php|sitemap(_index)?.xml|[a-z0-9_-]+-sitemap([0-9]+)?.xml)") {
		set $skip_cache 1;
	}   

	# Don't use the cache for logged in users or recent commenters
	if ($http_cookie ~* "comment_author|wordpress_[a-f0-9]+|wp-postpass|wordpress_no_cache|wordpress_logged_in") {
		set $skip_cache 1;
	}
	location / {
		try_files $uri $uri/ /index.php?$args;
	}   

	
 
	location ~ \.php$ {
	 	set $rt_session "";
	 	
		if ($http_cookie ~* "wp_woocommerce_session_[^=]*=([^%]+)%7C") {
               		set $rt_session wp_woocommerce_session_$1;
       		}	
	
		if ($skip_cache = 0 ) {
			more_clear_headers "Set-Cookie*";
			set $rt_session "";
		}
		
	        fastcgi_cache_key "$scheme$request_method$host$request_uri$rt_session";

		try_files $uri =404;
		include fastcgi_params;
		fastcgi_pass php;

		fastcgi_cache_bypass $skip_cache;
	        fastcgi_no_cache $skip_cache;

		fastcgi_cache WORDPRESS;
		fastcgi_cache_valid  60m;
	}

	include /etc/nginx/common/wpcommon.conf;
	include /etc/nginx/common/locations.conf;

}