cdn可以加速几个域名

http {
    upstream cdn_nodes {
        server cdn1.example.com;
        server cdn2.example.com;
        server cdn3.example.com;
    }

    server {
        listen 80;
        server_name example.com www.example.com;

        location / {
            proxy_pass http://cdn_nodes;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }
    }

    server {
        listen 80;
        server_name api.example.com;

        location / {
            proxy_pass http://cdn_nodes;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }
    }
}