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add assert message for errorhandler exception type

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jackwardell 2020-04-16 17:01:51 +01:00 • committed by David Lord
parent 2062d984ab
commit 846ee2c62e
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2 changed files with 11 additions and 1 deletions
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4
src/flask/app.py
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@ -1270,7 +1270,9 @@ class Flask(_PackageBoundObject):
else:
exc_class = exc_class_or_code
assert issubclass(exc_class, Exception)
assert issubclass(
exc_class, Exception
), "Custom exceptions must be subclasses of Exception."
if issubclass(exc_class, HTTPException):
return exc_class, exc_class.code