Add all handlers to good names. #248
Description
C0103: Constant name "handler403" doesn't conform to UPPER_CASE naming style (invalid-name)
All handlers must be in good names. Handlers are handler400, handler403, handler404.
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C0103: Constant name "handler403" doesn't conform to UPPER_CASE naming style (invalid-name)
All handlers must be in good names. Handlers are handler400, handler403, handler404.