AWS CloudFront向けデバイスインテリジェンス

// Lambda@Edge — origin-request function
exports.handler = async (event) => {
  const request = event.Records[0].cf.request
  if (!request.uri.startsWith('/tracio/')) {
    return request
  }
  // Rewrite the origin to your tracio.ai server
  request.uri = request.uri.replace(/^\/tracio/, '')
  request.origin = {
    custom: {
      domainName: process.env.TRACIO_ORIGIN || 'edge.tracio.ai',
      port: 443,
      protocol: 'https',
      sslProtocols: ['TLSv1.2'],
      path: '',
      readTimeout: 10,
      keepaliveTimeout: 5,
    },
  }
  // Forward client IP for accurate geolocation
  request.headers['x-forwarded-for'] = [{
    key: 'X-Forwarded-For',
    value: request.clientIp,
  }]
  // Set cache behavior: cache agent script, skip identification
  if (request.uri.includes('/agent')) {
    request.headers['cache-control'] = [{
      key: 'Cache-Control',
      value: 'public, max-age=3600',
    }]
  }
  return request
}