Not displayed webp

Maybe it confuses you that the “file extension” isn’t changed from jpeg to webp?

Excerpt from the FAQ:
Note that when WebP Express is serving varied image responses, the image URLs still points to the jpg/png. If the URL is visited using a browser that supports webp, however, the response will be a webp image. So there is a mismatch between the file extension (the filename ends with “jpg” or “png”) and the file type. But luckily, the browser does not rely on the extension to determine the file type, it only looks at the Content-Type response header.

See also this FAQ item:
https://ww.wp.xz.cn/plugins/webp-express/#how%20can%20a%20webp%20image%20be%20served%20on%20an%20url%20ending%20with%20%22jpg%22%3F

• This reply was modified 4 years, 6 months ago by rosell.dk.

Yes. The jpeg request is redirected on the server. So in the HTML it looks like it is a jpeg, but it is not. The browser does not rely on the file extension to determine the image type, it relies on a HTTP header.

All is good!

To have “webp” extension in HTML as well, you can enable Alter HTML. It will make your page load slightly slower, as it needs to modify the HTML on every page request.

• This reply was modified 4 years, 6 months ago by rosell.dk.

You probably already enabled Alter HTML, then?

Alter HTML handles many images, but not all (it depends on how it is inserted and which option you selected in Alter HTML – click the “View comparison chart” link in the setting page to learn about that). Those not handled by Alter HTML are handled by the internal image redirection.

• This reply was modified 4 years, 6 months ago by rosell.dk.