Nginx配置的问题，如何指向webapps目录？ ：报错

nginx.conf配置如下

upstream localhost {

server localhost:8080;

ip_hash; }

location / {
        index  index.html index.htm;
	proxy_pass  http://localhost; 
        proxy_redirect off;  
        proxy_set_header Host $host;  
        proxy_set_header X-Real-IP $remote_addr;  
        proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;  
        client_max_body_size   10m;   
        client_body_buffer_size  128k;  
        proxy_connect_timeout  100;  
        proxy_send_timeout   100;  
        proxy_read_timeout 100;  
        proxy_buffer_size 4k;  
        proxy_buffers  4 32k;  
        proxy_busy_buffers_size 64k;  
        proxy_temp_file_write_size  64k;
 }

问题是：这样只能指向一个tomcat,但是我想指向一个tomcat的webapps目录的某文件夹下，怎么破？