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Please pay attention to random failures.
https://mstdn.maud.io/@omasanori"Not all browsers support WebP. You can use the <picture> element in your HTML to offer both WebP and traditional image formats, leaving the final choice to the user’s browser. You can also detect WebP support on the server-side and serve images as appropriate, as supported browsers send an Accept: image/webp header when requesting images."
Firefoxが実装したから良しじゃなくちゃんとこういうこと書くのえらい