кэширование в nginx

народ, почему не пашет кэширование:

# Virtual host ms.mysite.ru

	server {

        listen 80;

        server_name ms.mysite.ru www.ms.mysite.ru;

        access_log /var/log/nginx/ms.mysite.ru.access.log;

        error_log /var/log/nginx/ms.mysite.ru.error.log error;



		root /var/www/vhosts/mysite.ru/ms/;

	    index index.html index.php;		

        location / {           

		   try_files $uri $uri/ /index.php?$query_string;

        }



        error_page  404 /404.html;

        location = /404.html {

            root   /usr/share/nginx/html;

        }

        

        error_page   500 502 503 504 /50x.html;

        location = /50x.html {

            root   /usr/share/nginx/html;

        }

        

        location ~ \.php$ {

           fastcgi_pass   127.0.0.1:9000;

           fastcgi_index  index.php;

           fastcgi_param  SCRIPT_FILENAME /var/www/vhosts/mysite.ru/ms$fastcgi_script_name;

		   fastcgi_param  PATH_INFO $fastcgi_script_name;

           include        fastcgi_params;

        }

	   

	    location ~ /(protected|themes/classic/views)/ {

			deny all;

		}

		

		# caching of files 

        location ~* \.(ico|pdf|flv)$ {

                expires 1y;

        }



        location ~* \.(js|css|png|jpg|jpeg|gif|swf|xml|txt)$ {

                expires 14d;

        }



    }