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See pallets/flask#3249. The behavior introduced in 0.15.0 was to show the error unless
e.argswas empty. However, this makes it impossible for an error handler to know what the missing key was.Instead, add a
show_exceptionattribute to explicitly control the behavior. This defaults to false for a more secure default behavior. Now Flask can do:While this is technically not backwards compatible, it adds information overall and sets a more secure default, and it was a fairly obscure and recent change to begin with, so I'm comfortable adding this to 0.15.5.