[5.x] Handle lock timeout in cache middleware #10607
Merged
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If you have static caching enabled, and you visit a page that is being generated in another process, your request will wait until the other request is done. If that takes longer than 30 seconds, you'll get an exception since #10370. Before that, I think the page would just time out.
This PR will now output a blank page that says unavailable and automatically refreshes. This is the same thing that happens in the Stache locking middleware.