Fix webview testapp jnius usage#2597
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AndreMiras merged 2 commits intokivy:developfrom May 20, 2022
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Current Flask throws an exception if a view function returns `None`: ``` python : TypeError: The view function for 'vibrate' did not return a valid response. The function either returned None or ended without a return statement. ``` Maybe that was different in the past, but instead a proper response can be returned. An empty 200 would be fine, but a 204 No Content response is used since it better represents what's happening.
When flask is run in threaded mode, it creates a new thread to handle each response. In that case, Java classes found with jnius will use the system class loader instead of the app class loader since the new thread has no stack frame back to the app. Normally you'd resolve the classes first, but the test app is explicitly trying to delay loading the classes until needed. That won't work from new native threads.
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Disable flask threading so that jnius works using the webview bootstrap. See #2533 for more details.