one canonical Flask debug config #4683
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jmcrawford45
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Nov 2, 2023
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Flask configuration variables are case sensitive. Therefore, DEBUG and debug would be two different configuration variables, if both were used.
However, by convention and per Flask's documentation, the correct configuration variable for activating debug mode is DEBUG, not debug.
In other words, Flask recognizes DEBUG as the configuration variable to control the activation of debug mode. Using debug would not have the desired effect unless you've added custom code in your application to also check for a debug configuration variable.