Did you enable H3 on your site and not sure how to verify it?
HTTP3 or H3 is the latest HTTP protocol developed by IETF. It’s still in a draft and expected to be supported by major browser/clients soon. H3 is based on the QUIC transport layer network protocol, which was originally designed by Google. It’s different than earlier versions like H2, which was derived from the SPDY protocol.
Cloudflare published a great blog post explaining the technical implementation. Worth reading it.
At the time of writing, very few server-side applications/webservers/network devices/CDN support H3. And, you can guess – Cloudflare is the first CDN to offer H3.
Let’s talk about client-side support.
H3 is still in the draft, so not every browser support H3 yet. At this time, you can use the following to test it. As usual, can I use would be a go-to reference to check supported browsers?
HTTP/3 test by Domsignal quickly 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.
Alternatively, you can check the same for all your web properties with the Geekflare HTTP Protocol API. This brings in much-needed speed if you have multiple subject websites for reporting.
Interestingly, the free tier is a zero-risk way to try that for 3000 API calls per month. However, there are upgrades starting with a monthly $5 that comes with 10K API requests with a much higher rate of 25 requests per second.
A web tool by LightSpeed.
Access HTTP/3 Check and enter the URL to be tested. You will get the results instantly.
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.
As the founder of Geekflare, I’ve helped millions to excel in the digital realm. Passionate about technology, I’m on a mission to explore the world and amplify growth for professionals and businesses alike.