如何解决 nginx proxy_pass 使用变量 500？

Question

map $http_host $dip {

default '';
~/(?<sid>31)$ 10.0.0.10;

}

map $dip $game_port {

default '';
10.0.0.10 8080;

}

server {

listen 80;
server_name 10.0.0.5;
charset utf-8;
client_body_buffer_size 10M;
proxy_redirect     off;
proxy_set_header   Host             $host:$server_port;
proxy_set_header   X-Real-IP        $remote_addr;
proxy_set_header X-Forwarded-Host $host:$server_port;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_next_upstream error timeout invalid_header http_502 http_503 http_504;

location / {
   proxy_pass http://$dip:$port;
   proxy_read_timeout 300s;
   proxy_send_timeout 300s;
   proxy_set_header Host $host;
   proxy_set_header X-Real-IP $remote_addr;
   proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
   proxy_http_version 1.1;
   proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "Upgrade";
}

}

为什么proxy_pass http://$dip:$port; 这块调用不到上面map定义的变量呢！

Answer 1

listen 后加上 resolver 8.8.8.8;

8.8.8.8 是 DNS 地址。