These kinds of error messages are almost exclusively used for transient errors. You aren’t going to work around a transient error. The best thing you can do (the only thing you can do, really) is to try again later, hence, the message. It’s not helpful to show you a message like “cache-1234.example.com failed to respond within 300 milliseconds”. What are you going to do about that? By the time you submit a support ticket, that host has already been brought back up automatically. So now you’ve just wasted your time and the support staff’s time. The engineers already have a log of that error and a log of whatever error brought down that host, so you’re not telling them anything new by making a support ticket.