Repost from Autosmush topic:      In regards to .webp if anyone should be interested:  If you're using Cloudflare free plan, it doesn't matter anyway. Cloudflare free plan doesn't support HTTP vary header so this :   – Will NOT do anything useful. Because Cloudflare will serve your webp version NO MATTER WHAT. Which means that Safari on Mac and all iOS devices will not show any pictures... 😢  Source: