在设置 nginx 多 location 子路径反向代理时，必须设置 proxy_pass 也为子路径，名字不必相同

        location /admin/api {
            proxy_pass http://172.26.190.212:7001/api;
            proxy_set_header X_Real_IP $remote_addr;
            proxy_set_header X-Forwarded-For $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $host;
            proxy_connect_timeout       600;
            proxy_send_timeout          600;
            proxy_read_timeout          600;
            send_timeout                600;
        }

        location /student/api {
            proxy_pass http://172.26.190.212:7002/api;
            proxy_set_header X_Real_IP $remote_addr;
            proxy_set_header X-Forwarded-For $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $host;
            proxy_connect_timeout       600;
            proxy_send_timeout          600;
            proxy_read_timeout          600;
            send_timeout                600;
        }

        location /data/api {
            proxy_pass http://172.26.190.212:7003/api;
            proxy_set_header X_Real_IP $remote_addr;
            proxy_set_header X-Forwarded-For $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $host;
            proxy_connect_timeout       600;
            proxy_send_timeout          600;
            proxy_read_timeout          600;
            send_timeout                600;
        }