Community Tip - HTTP/3 (with QUIC)

Known Issue
As of November 2020, we have temporarily disabled HTTP/3 on a set of zones while we investigate a degraded performance issue with some zones. As soon as that issue has been resolved we will re-enable HTTP/3 on these zones. You do not need to contact Support to report this issue.

Try the suggestions in this Community Tip to try out the the future of the internet, HTTP/3 (with QUIC).


According to Wikipedia, HTTP/3 is the upcoming third major version of the Hypertext Transfer Protocol used to exchange binary information on the World Wide Web. Further details on Wikipedia.

HTTP/3 (with QUIC)

  1. To enable HTTP/3 (with QUIC), navigate to your Network app on the Cloudflare dashboard and click Join the Waitlist:

    The option will change to Waitlist requested.
  2. Follow the instructions in the Lite Reading blog to to download and install the latest Canary build.
  3. Next, enable HTTP/3 support by starting Chrome Canary with the --enable-quic and --quic-version=h3-23 command-line arguments. Once Chrome is started with the required arguments, you can just type your domain in the address bar, and see it loaded over HTTP/3. Use the Network tab in Chrome’s Developer Tools to check what protocol version was used.

Lite Reading

Background Resources

If You Need More Help
This community of other Cloudflare users may be able to assist you, if not, follow the instructions in this Tip to report the issue with HTTP/3 (with QUIC) to our engineers. When you report the issue, make sure to include as much of this information as possible and help our engineers help you. The best way to reach Cloudflare Customer Support is to login to Cloudflare and then contact Cloudflare Support.

Expert Comments Appreciated
This Community Tip will remain open for input from Community experts and those familiar with HTTP/3 (with QUIC). We really appreciate comments like: “What are the three things to always try”, or “Do this first” or “In my experience”.

This is a Cloudflare Community Tip, to review other tips, click here.

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