Nginx configruation with gzip and cache control

saas.conf

server {
    server_name saas.domain.com;
    access_log /www/logs/saas.domain.com_access.log;
    error_log /www/logs/saas.domain.com_error.log;
    root /www/sites/saaspos/public;

    index index.php index.html index.htm;
    # Begin to gzip config
    gzip on;
    gzip_min_length 1k;
    gzip_comp_level 2;
    gzip_types application/javascript application/x-javascript text/css application/xml text/javascript;
    gzip_vary on;
    gzip_disable "MSIE [1-6]\.";
    # End of gzip config
    try_files $uri $uri/ @rewrite;

    location @rewrite {
        rewrite ^/(.*)$ /index.php?_url=/$1;
    }
    location ~ \.php$ {
        try_files $uri =404;
        include /etc/nginx/fastcgi_params;
        fastcgi_pass  127.0.0.1:9000;
        fastcgi_index index.php;
	fastcgi_split_path_info       ^(.+\.php)(/.+)$;
        fastcgi_param PATH_INFO       $fastcgi_path_info;
        fastcgi_param PATH_TRANSLATED $document_root$fastcgi_path_info;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    }
    location ~* ^.+\.(css|js|txt|xml|swf|wav)$ {
    	access_log   off;
    	expires      24h;
    }
}