Enables optimizations based on content negotiation.
The only negotiated optimization currently available is for WebP, an image compression format with limited browser support.
|If the browser's |
- Although the WebP format produces images at a higher compression ratio with a lower loss of quality, it is not supported in all browsers.
- When using Firefox version 66 or above, automatic content negotiation will not occur when opening the image in the browser. To view WebP images generated via
auto=webpyou must insert your image onto a web page.
Click the links to view the transformed image using a demo Fastly IO service.
|Deliver lossless (because input image is lossless) WebP where client support is available, otherwise deliver a PNG|
|Deliver lossy (because |
|Deliver lossless (because |