Https://openqa.fedoraproject.org/nightlies.html failed to open by firefox

Under Fedora-34, from time to time, Firefox will failed to open Fedora nightly compose finder .

At this moment, Chrome and Vivaldi has no problem open that link, but Firefox failed with:

Service Unavailable

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
Apache Server at openqa.fedoraproject.org Port 443

It is the same as normal Firefox and Private Firefox.

Normally, sometimes later (hours or days) it will resume normal again.

Next time try to delete cached files for openqa.fedoraproject.org in Firefox. Can be that you once got this message for real and now when you have a poor connection it reads the cache again.

Alternatively you could also check session cookies.

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