Why can't I access my WWW prefix domain with CDN?

Question

I know this kind of question have existing solutions , but none of them solve my problems

once I enter my web with prefix WWW , it displays such 403 error:

403 error demo

This is my Domain parse setting:

Domain parse setting screenshot

And this is my CDN setting screenshot, my server is Aliyun cloud. CDN setting screenshot

This is my Nginx configuration screenshot:

Nginx configuration screenshot

as you can see , I configure www.example.com and example.com in my Nginx , I also add CDN CNAME to www.example.com and example.com , I can access example.com but cant access www.example.com.

and I ping both of them , they can response normally with CDN domain address but different IP address, Here is the Ping screenshot

Ping screenshot

But I just can't access www.example.com in browser , it is so wired.

BTW,this is my whole Nginx configure

mysite_nginx.conf

 the upstream component nginx needs to connect to
upstream django_ {
    # server unix:///path/to/your/mysite/mysite.sock; # for a file socket

    server 127.0.0.1:8005; # for a web port socket (we'll use this first)
}

 configuration of the server
server {
    # the port your site will be served on
    listen      80;
    # the domain name it will serve for
    server_name www.labtine.com labtine.com # substitute your machine's IP address or FQDN
    charset     utf-8;

    # max upload size
    client_max_body_size 75M;   # adjust to taste
    # Django media
    location /media  {
        alias /home/cg_log/CG_log/media;  # your Django project's media files - amend as required
    }

    location /static {
        alias /home/cg_log/CG_log/static; # your Django project's static files - amend as required
    }

    # Finally, send all non-media requests to the Django server.
    location / {


        uwsgi_pass 127.0.0.1:8003;
        include     /etc/nginx/uwsgi_params; # the uwsgi_params file you installed
    }
}