Flask Framework Cookbook - Second Edition

Creating custom 404 and 500 handlers

Every application throws errors to users at some point in time. These errors can be due to the user typing a non-existent URL (404), application overload (500), or something forbidden for a certain user to access (403). A good application handles these errors in a user-interactive way instead of showing an ugly white page, which makes no sense to most users. Flask provides an easy-to-use decorator to handle these errors. In this recipe, we will understand how we can leverage this decorator.