# WebSocket Upgrade 헤더 동적 처리 (Connection: upgrade ↔ close)
map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}

server {
    listen       80;
    server_name  _;
    root         /usr/share/nginx/html;
    index        index.html;

    client_max_body_size 32m;

    resolver 127.0.0.11 8.8.8.8 8.8.4.4 valid=30s;
    resolver_timeout 5s;

    include /etc/nginx/gc-locations.inc;
}