Safari 15.3 HTTP_ACCEPT header does not report webp support...

[glawrie]

Noticed today that Apple's Safari 15.3 browser does not report on its ability to render webp images via the HTTP_ACCEPT header.

Currently pretty much the only way for server side testing for webp support is to poll the HTTP_ACCEPT header and look to see if it mentions webp support: this much is acknowledged by Google - it is the only pure server side solution mentioned in its developer notes on webp.

Here is an HTTP_ACCEPT header from Firefox Developer 98 on macOS ...
"text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8"

Here is one from Opera 84
"text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9"

Here is one from Edge 98
"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9"

And here is what you get from Safari 15.3...
"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"

I mean really... would it be so hard for Apple to report image handling like the others do? Especially since it is mostly to avoid Apple browsers that don't support Webp that servers need to check for support ...

Sometimes Apple make it really hard to be supportive...

 

[Slartibart]

on MacOS it is actually only partly supported… Big Sur and later. It’s a pity.