tencent cloud

async function handleEvent(event) {
  const { request } = event;
  
  // 获取客户端支持的图片类型
  const accept = request.headers.get('Accept');
  const option = { eo: { image: {} } };
  
  // 检查客户端是否支持 WebP 格式的图片,若不支持响应原图
  if (accept && accept.includes('image/webp')) {
    option.eo.image.format = 'webp';
  }
  
  const response = await fetch(request, option);
  return response;
}

addEventListener('fetch', event => {
  // 当函数代码抛出未处理的异常时，边缘函数会将此请求转发回源站 
  event.passThroughOnException();
  event.respondWith(handleEvent(event));
});