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Did you enable H3 on your site and not sure how to verify it?
HTTP3or H3 is the latest HTTP protocol developed by IETF.
Its still in a draft and expected to be supported by major net surf tool/clients soon.
H3 is based on theQUICtransport layer online grid protocol, which was originally designed by Google.
Its different than earlier versions likeH2, which was derived from the SPDY protocol.
Cloudflarepublished a great blog post explaining the technical implementation.
At the time of writing, very few server-side applications/webservers/data pipe devices/CDN support H3.
And, you’re able to guess Cloudflare is the first CDN to offer H3.
Lets talk about client-side support.
H3 is still in the draft, so not every internet tool support H3 yet.
At this time, you’re able to use the following to test it.
As usual,can I usewould be a go-to reference to check supported browsers?
Domsignal
HTTP/3 test byDomsignalquickly connects your site using cURL and reveals if it supports H3/QUIC protocol.
If the connection is successful, then it shows the advertised supported versions.
Interestingly, the free tier is a zero-risk way to try that for 3000 API calls per month.
HTTP/3 Check
A web tool by LightSpeed.
AccessHTTP/3 Checkand enter the URL to be tested.
You will get the results instantly.
Firefox
Firefox Nightlyhas recently announced H3 support.
Firefox Nightly now has early HTTP/3 support for public testing!
Google Chrome
You expected it, didnt you?
you’re able to useChrome Canaryto test.
You will not see H3 or HTTP/3 as a protocol in developer tools but http2+quic/99.
Geekflare API
Need to test it programmatically?
Interestingly, the free tier is a zero-risk way to try that for 3000 API calls per month.
cURL
Dont want to leave your terminal?
cURLis great, and the latest version lets you test using–http3flag.
DownloadcURL and build it from the source.
Another option would be to build the cURL client as below.
This would work on Linux.
Conclusion
I hope this gives you an idea about testing the site if HTTP/3 is enabled.
If you are a site owner, then take advantage of this latest protocol for better web performance.
