Does CDN support HTTP/3?

Yes. is capable of serving requests via HTTP/3 to browsers that also support the protocol. But unlike other CDNs, is also capable of making backend HTTP/3 connections! If your site’s origin server supports HTTP/3 (it does if you are running on LiteSpeed Web Server) and your visitor’s browser supports HTTP/3, then will serve your content end-to-end via HTTP/3. If either the origin server or the client cannot handle an HTTP/3 connection, will connect via HTTP/2 or HTTP/1 as appropriate.