server {
        listen 443 ssl;

        server_name whaletownend.xinghangee.icu;

        ssl_certificate /home/ubuntu/node_test/keys/whaletownend.xinghangee.icu_bundle.crt;
        ssl_certificate_key /home/ubuntu/node_test/keys/whaletownend.xinghangee.icu.key;
        client_max_body_size 500M;
        ssl_session_timeout 5m;

        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:HIGH:!aNULL:!MD5:!RC4:!DHE;
        ssl_prefer_server_ciphers on;
        add_header X-Content-Type-Options "nosniff" always;
        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
        add_header Referrer-Policy "strict-origin-when-cross-origin" always;
        add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;

        location /socket.io/ {
                proxy_pass http://127.0.0.1:3000/socket.io/;

                # 基础反向代理头
                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_set_header X-Forwarded-Proto $scheme;

                # Socket.IO/WebSocket 核心配置
                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection $connection_upgrade;

                # 关键：Socket.IO 需要长超时 + 关闭缓冲
                proxy_connect_timeout 75s;
                proxy_send_timeout 3600s;
                proxy_read_timeout 3600s;
                proxy_buffering off;
                proxy_cache off; # 关闭缓存，避免 Socket.IO 消息延迟
        }

        location / {
                proxy_pass         http://127.0.0.1:3000;
        # 必须加的 header
                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_set_header   X-Forwarded-Proto $scheme;

        # 避免第一次请求断开
                proxy_http_version 1.1;
                proxy_set_header Connection "";

        # 调大超时，避免初始化时被踢掉
                proxy_connect_timeout   60s;
                proxy_send_timeout      60s;
                proxy_read_timeout      60s;

        # 建议关闭缓冲，防止页面流式加载时被截断
                proxy_buffering off;
    }
}