worker_processes auto;
error_log /var/log/nginx/error.log warn;

events {
    worker_connections 1024;
    use epoll;
    multi_accept on;
}

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';
    access_log /var/log/nginx/access.log main;

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;

    client_max_body_size 20m;

    server {
        listen 80;
        server_name _;

        # Nginx 自身健康检查
        location /health {
            access_log off;
            return 200 'ok';
            add_header Content-Type text/plain;
        }

        # 默认代理到 blue，部署时通过 sed 切换
        location / {
            proxy_pass http://blue:8000;
            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;

            # WebSocket 支持（AI 流式输出）
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";

            # 流式输出，关闭缓冲
            proxy_buffering off;
            proxy_cache off;

            proxy_connect_timeout 300s;
            proxy_send_timeout 300s;
            proxy_read_timeout 300s;
        }
    }
}