worker_processes auto;
worker_rlimit_nofile 65535;

events {
    use epoll;
    worker_connections 65535;
    multi_accept on;
}

http {
    # 基础设置
    sendfile on;
    tcp_nodelay on;          # 开启 TCP_NODELAY
    tcp_nopush on;          # 开启 TCP_NOPUSH
    proxy_buffering off;     # 关闭代理缓冲
    chunked_transfer_encoding on;  # 启用分块传输编码

    # MIME类型
    include /etc/nginx/mime.types;
    
    # 客户端设置
    client_max_body_size 100M;
    client_body_buffer_size 128k;
    client_body_timeout 30s;
    client_header_timeout 30s;
    
    # 连接优化
    keepalive_timeout 120;   # 设置保持连接的超时时间
    keepalive_requests 100;   # 客户端保持连接请求的数量
    
    # 压缩设置
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types text/plain text/css text/xml application/json application/javascript application/rss+xml application/atom+xml image/svg+xml;
    
    # 缓存设置
    proxy_request_buffering off;
    
    # 日志配置
    access_log /tmp/nginx_access.log;
    error_log /tmp/nginx_error.log warn;
    
    # 上游服务器配置
    upstream backend {
        least_conn;
        server 127.0.0.1:3000 max_fails=3 fail_timeout=30s;
        keepalive 64;
    }
    
    server {
        listen 3001 http2;  # 监听端口并启用 HTTP/2

        server_name localhost;
        
        # OpenAI API 路由
        location /ai/v1/ {
            rewrite ^/ai/v1/(.*)$ /v1/$1 break;
            proxy_pass http://backend;
            
            # 请求头设置
            proxy_set_header Host $host;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            
            # 清除敏感头部
            proxy_set_header X-Forwarded-For "";
            proxy_set_header X-Real-IP "";
            proxy_set_header X-Direct-Url "";
            proxy_set_header X-Forwarded-Port "";
            proxy_set_header X-Ip-Token "";
            proxy_set_header X-Request-Id "";
            proxy_set_header X-Amzn-Trace-Id "";
            proxy_set_header X-Forwarded-Proto "";
            
            # 超时设置
            proxy_connect_timeout 60s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;
            
            error_page 503 =429 /429.html;
        }
        
        location / {
            proxy_pass http://backend;
            
            # 请求头设置
            proxy_set_header Host $host;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            
            # 清除敏感头部
            proxy_set_header X-Forwarded-For "";
            proxy_set_header X-Real-IP "";
            proxy_set_header X-Direct-Url "";
            proxy_set_header X-Forwarded-Port "";
            proxy_set_header X-Ip-Token "";
            proxy_set_header X-Request-Id "";
            proxy_set_header X-Amzn-Trace-Id "";
            proxy_set_header X-Forwarded-Proto "";
            
            # 超时设置
            proxy_connect_timeout 60s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;

            error_page 503 =429 /429.html;
        }
        
        # 429错误页面
        location = /429.html {
            return 429 'Too Many Requests';
        }
    }
}