events {
    worker_connections 1024;
}

http {
    # --- 基础 IO 优化 ---
    sendfile        on;
    tcp_nopush      on;
    tcp_nodelay     on;

    # --- Keepalive ---
    keepalive_timeout  65;
    keepalive_requests 1000;

    # --- 客户端超时（防慢连接拖死 worker）---
    client_max_body_size      16m;
    client_body_buffer_size   128k;
    client_header_buffer_size 1k;
    large_client_header_buffers 4 8k;
    client_body_timeout       30s;
    client_header_timeout     30s;
    send_timeout              30s;

    # --- 反代默认参数（各 conf.d 可按需覆盖）---
    proxy_http_version 1.1;
    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;
    proxy_set_header   Connection "";
    proxy_connect_timeout 3s;
    proxy_send_timeout    30s;
    proxy_read_timeout    30s;
    proxy_buffer_size          16k;
    proxy_buffers              8 16k;
    proxy_busy_buffers_size    32k;

    # --- Gzip 压缩 ---
    gzip on;
    gzip_min_length 1k;
    gzip_comp_level 5;
    gzip_types text/plain text/css application/json application/javascript application/xml image/svg+xml;
    gzip_proxied any;
    gzip_vary on;

    # --- SSL 安全配置 ---
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305;
    ssl_prefer_server_ciphers on;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 1d;
    ssl_session_tickets on;

    # --- 关闭版本号 ---
    server_tokens off;

    include /etc/nginx/conf.d/*.conf;

    # 所有 HTTP 自动跳 HTTPS
    server {
        listen 80 default_server;
        server_name _;

        location / {
            return 301 https://$host$request_uri;
        }

        # 让证书续期正常工作（必须留）
        location /.well-known/acme-challenge/ {
            root /var/www/html;
            try_files $uri =404;
        }
    }
}