upstream java_api {    server 127.0.0.1:8080;}server {    listen  80;    server_name  www.heboan.com;    access_log /var/log/nginx/log/www_heboan_com.access.log    root /opt/app/code;    location ~ \.jsp$ {        proxy_pass  http://java_api;        index  index.html index.htn;    }    location ~ \.(jpg|png|gif)$ {        expires 1h;        gzip on;    }    error_page  500 502 503 504 404 /50x.html;}