tencent cloud

async function handleEvent(event) {
  const { request } = event;
  
  // Get the image type supported by the client
  const accept = request.headers.get('Accept');
  const option = { eo: { image: {} } };
  
   // Check whether the client supports WebP format images, if not, respond with the original image
  if (accept && accept.includes('image/webp')) {
    option.eo.image.format = 'webp';
  }
  
  const response = await fetch(request, option);
  return response;
}

addEventListener('fetch', event => {
   // When the function code throws an unhandled exception, the Edge function transmits the request back to the origin
  event.passThroughOnException();
  event.respondWith(handleEvent(event));
});