Edge Computing: Cloudflare Workers 与 AWS Lambda@Edge 对比

// Cloudflare Worker
export default {
  async fetch(request: Request, env: Env): Promise<Response> {
    const url = new URL(request.url)
    const cacheKey = `page:${url.pathname}`
    
    // 检查 KV 缓存
    const cached = await env.KV.get(cacheKey, 'json')
    if (cached) {
      return Response.json(cached, {
        headers: { 'X-Cache': 'KV' }
      })
    }
    
    // 从源站获取数据
    const response = await fetch(`https://origin.example.com${url.pathname}`)
    const data = await response.json()
    
    // 在 KV 中进行异步缓存
    env.KV.put(cacheKey, JSON.stringify(data), { expirationTtl: 300 })
    
    return Response.json(data)
  }
}

// AWS Lambda@Edge (源站请求)
exports.handler = async (event) => {
  const request = event.Records[0].cf.request
  const response = event.Records[0].cf.response
  
  // 添加安全请求头
  response.headers['strict-transport-security'] = [{
    key: 'Strict-Transport-Security',
    value: 'max-age=63072000; includeSubdomains; preload'
  }]
  
  response.headers['x-content-type-options'] = [{
    key: 'X-Content-Type-Options',
    value: 'nosniff'
  }]
  
  return response
}