我是非常新的django和nginx和尝试主机我的应用程序使用nginx作为服务器。我可以设置前端与域名和80作为端口，但我无法设置后端与域名服务端口8000。但当我使用的IP地址似乎工作正常，但不与域名。我一直在尝试，因为两天，似乎没有工作。任何帮助都将不胜感激。
前端配置

server{
listen 80;
listen [::]:80;
listen 443 ssl;

include snippets/snakeoil.conf;
server_name example.com;

location = /favicon.ico { access_log off; log_not_found off; }

location / {
            # reverse proxy for next server
            proxy_pass http://localhost:3000;
            proxy_http_version 1.1;
            proxy_headers_hash_max_size 512;
            proxy_headers_hash_bucket_size 128;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection 'upgrade';
            proxy_set_header Host $host;
            proxy_cache_bypass $http_upgrade;
    }

 }

后端配置

server {
    listen 8000;
    server_name example.com;
    location = /favicon.ico { access_log off; log_not_found off; }
    location /static/ {
            root /root/backend/lithexBackEnd;
    }
    location / {
            include proxy_params;
            proxy_pass http://unix:/run/gunicorn.sock;
    }
}