Problem with ajp proxy module

[Orore Ma]

Hi,
No problem to make ajp module works but I have a problem with the ajp_cache directive.It stores only one file in the cache and always return this file.For example, if I call http://mon url/image.jpg, it will returns this file even when I will call http://mon url/style.css.
Here is my config file :
#user  nobody;worker_processes  1;
#error_log  logs/error.log;#error_log  logs/error.log  notice;#error_log  logs/error.log  info;
#pid        logs/nginx.pid;

events {    worker_connections  1024;}

http {    include       mime.types;    default_type  application/octet-stream;
    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '    #                  '$status $body_bytes_sent "$http_referer" '    #                  '"$http_user_agent" "$http_x_forwarded_for"';
    #access_log  logs/access.log  main;
    sendfile        on;    #tcp_nopush     on;
    #keepalive_timeout  0;    keepalive_timeout  65;
    #gzip  on;    upstream tomcat-preprod {        server pacaya.altima.fr:8012;        keepalive 10;    }    ajp_cache_path /var/www/cache levels=1:2 keys_zone=myzone:50m;        server {        listen       80;        server_name  erp-preprod;
	location ~ \.(js|css|png|gif|jpg|ico)$ {		ajp_pass tomcat-preprod;		ajp_cache_valid 60m;		ajp_cache myzone;	}
	location /sx-preprod {		ajp_keep_conn on;		ajp_pass tomcat-preprod;	}	location /sx {		rewrite /sx /sx-preprod;	}
	location  / {		rewrite / /sx-preprod;	}		        error_page   500 502 503 504  /50x.html;        location = /50x.html {            root   html;        }
    }
}
Any advice ? 		 	   		  
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