Safari do not send image/webp in accept headers

[hebrerillo]

I developed a server side script to check if the browser supports webp format images by checking the "image/webp" string in the accept request headers. The problem is that recent versions of Safari, even though they support Webp, they do not send the string "image/webp" in the headers. Why?? How can I check if the Safari browser supports webp??

[requinix]

You can't. Not from PHP. But Safari on any Mac that's been updated in the last couple years will support it.

There are client-side options, if you really need to know.

Or you could just, you know, not serve WEBPs to Safari.

[hebrerillo]

@requinix thank you so much for your answer!

I know a client-side solution like this one, but that would mean blocking JavaScript which will delay the page rendering.

I want to serve WEBP images to Safari if supported. Maybe I could detect in PHP if the request was performed using Safari and its version to serve Webp images.

Thank you anyway 🙂

Edited November 15, 2023 by hebrerillo

[maxxd]

According to https://caniuse.com/?search=webp safari has supported webp since November 2020 on Big Sur or above. I can't remember what OsX is on now, but again according to caniuse.com it's been completely supported since September 2022. You're probably OK to assume it's safe to use.