Cloudflare activated HTTP/3 (QUIC) on one of my domains.
I have enabled HTTP/3 (QUIC) for the domain
Downloaded Chrome Canary browser for Win 10 64 bit.
Added the following in the target field (by accessing Chrome Canary.exe properties)
“C:\Users\Name\AppData\Local\Google\Chrome SxS\Application\chrome.exe” --enable-quic --quic-version=h3-23
Enabled the support for HTTP/3 (QUIC) in Chrome://flags/
Visited the website and looked at the developer tools > network tap > protocol > it is mostly h2 or http/1.1 for all resources except Google resources which are http/2+quic/46
Note that due to how HTTP/3 is negotiated between the browser and the server, HTTP/3 might not be used for the first few connections to the domain, so you should try to reload the page a few times.
Wasn’t able to get it on Cloudflare.com, but got it on my own https://judge.sh first try (but not on the first request due to how H3 negotiates itself as said above)
Try canary browser with http/3 flags enabled --enable-quic --quic-version=h3-23 on other cloudflare http/3 enabled sites to verify it isn’t a problem with your browser/pc
The browser doesn’t seem to show http/2+quic/46 for all the websites listed above.
Both in Incognito mode and normal mode of Chrome Canary
(with “C:\Users\Name\AppData\Local\Google\Chrome SxS\Application\chrome.exe” --enable-quic --quic-version=h3-23) on target field of Chrome Canary.exe properties.