This example determines whether the request header Accept
contains image/webp
. If so, the Edge function will automatically convert the image format to WebP
and cache it on the EdgeOne edge node. If your Web application displays a large amount of PNG
and JPEG
format images and you want to automatically optimize the images at the edge to reduce traffic bandwidth costs, you can use Edge functions to implement a smooth upgrade, automatically converting PNG
and JPEG
format images to WebP
format with 0 changes to the business code. For more image conversion formats, please refer to ImageProperties. async function handleEvent(event) {
const { request } = event;
const accept = request.headers.get('Accept');
const option = { eo: { image: {} } };
if (accept && accept.includes('image/webp')) {
option.eo.image.format = 'webp';
}
const response = await fetch(request, option);
return response;
}
addEventListener('fetch', event => {
event.passThroughOnException();
event.respondWith(handleEvent(event));
});
Example Preview
Enter the URL that matches the triggering rules of the Edge function in the address bar of the browser on the PC side and mobile side (e.g., https://example.com/images-format/ef-1.jpeg
), and the image will be automatically converted to Webp format.
Related References
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