HTTP2 health check fails in Data Center when configuring CDN
Platform Notice: Data Center Only - This article only applies to Atlassian products on the data center platform.
Problem
The CDN administration screen in your Data Center application displays one of the following failed warnings:
Can’t check HTTP/2 connection
This browser can’t check whether you have a HTTP/2 connection. Use a different browser to make sure you can reach your CDN over HTTP/2.
HTTP/2 required
Your network infrastructure (such as your load balancer, firewall, or proxy) must allow HTTP/2 traffic. Learn more
Cause
Your load balancer, reverse proxy, or web application firewall has not been configured to allow HTTP/2 traffic, or the browser you are using does not fully support HTTP/2, so we can't complete the check.
While not mandatory, using HTTP/2 is highly recommended, and will provide the best performance for your end users.
Resolution
You will need to update your load balancer, proxy, or firewall configuration to allow HTTP/2 traffic. Check the documentation for your particular infrastructure to find out how to do this.
Note: a small number of browsers, such as Internet Explorer, don't fully support HTTP/2, which means our health check won't be able to check your HTTP/2 connection. We recommend switching to another browser if you see this message.