Nginx Conf

server {
    listen 80;
    server_name your-domain.com; # 换成你的域名

    location / {
        # 允许跨域配置（可选，如果你是前端直接调）
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization,x-goog-api-key' always;

        if ($request_method = 'OPTIONS') {
            return 204;
        }

        # 设置后端目标地址
        proxy_pass https://generativelanguage.googleapis.com;
        
        # 必须设置的 Header
        proxy_set_header Host generativelanguage.googleapis.com;
        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;

        # 关键：禁用缓存，确保流式输出（Stream）正常工作
        proxy_buffering off;
        proxy_cache off;
        proxy_http_version 1.1;
        
        # 延长超时时间，防止长文本生成时连接断开
        proxy_read_timeout 300s;
    }
}

JavaScript

export default {
  async fetch(request, env) {
    const url = new URL(request.url);
    
    // 1. 将请求的目标替换为 Google 的 API 地址
    const targetUrl = 'https://generativelanguage.googleapis.com' + url.pathname + url.search;

    // 2. 复制原始请求的 Header，并进行必要修改
    const newHeaders = new Headers(request.headers);
    newHeaders.set('Host', 'generativelanguage.googleapis.com');
    
    // 如果你想在 Worker 中直接注入 API Key（可选）
    // newHeaders.set('x-goog-api-key', '你的_GEMINI_API_KEY');

    // 3. 构建新的请求
    const newRequest = new Request(targetUrl, {
      method: request.method,
      headers: newHeaders,
      body: request.body,
      redirect: 'follow'
    });

    // 4. 发送请求并返回响应
    // 默认支持流式传输 (Streaming)，无需额外配置
    return await fetch(newRequest);
  }
};