upstream myserver {

        server 127.0.0.1:5000 weight=3;
        server 192.168.1.2:5000 weight=1;
        server 192.168.1.3:5000 weight=1;
    }

server {
    listen       80;
    #listen  [::]:80;
    server_name  library.aixueshi.top;

    #access_log  /var/log/nginx/host.access.log  main;

       location / {
            proxy_pass http://myserver/API/;
        }

}