Nginx 重写proxy_pass的URL代理到不同主机

需求背景，前端访问一个域名以URL区分代理到哪个后端服务，同时后端URL不包含这个匹配的URL

栗子：访问http://api.example.com/npt/users/info，其中 /npt 作为区分URL，后端user服务的URL只有/users/info，因此proxy_pass前就得先把URL的 /npt 给重写掉才能匹配到后端服务，下面是具体栗子代码

server {
        listen 80;
        server_name aa.com;

        location /npt {
                rewrite ^/npt/(.*) /$1 break;
                proxy_pass http://localhost:8080;
                access_log /home/npt.access.log json;
                error_log /home/npt.error.log;
        }

        location /apt {
				rewrite ^/apt/(.*) /$1 break;
                proxy_pass http://localhost:9090;
                access_log /home/apt.access.log json;
                error_log /home/apt.error.log;
        }
}

server {
        listen 8080;
        server_name _;
        location / {
                default_type text/html;
                return 200 'This is domain 8080 index text!';
        }
        location /abc {
                default_type text/html;
                return 200 'This is domain 8080 URL=/abc  text!';
        }
        location /qwe {
                default_type text/html;
                return 200 'This is domain 8080 URL=/qwe text!';
        }
}

server {
        listen 9090;
        server_name _;

        location / {
                default_type text/html;
                return 200 'This is domain 9090 index text!';
        }
        location /abc {
                default_type text/html;
                return 200 'This is domain 9090 URL=/abc text!';
        }
}