Web Reference: In addition to omitting a statement completely, another common error is to only return a response in some cases. If your view has different behavior based on an or a /, you need to ensure that every branch returns a response. By default if your application runs in production mode, and an exception is raised Flask will display a very simple page for you and log the exception to the logger. But there is more you can do, and we will cover some better setups to deal with errors including custom exceptions and 3rd party tools. Error Logging Tools ¶ Jul 25, 2025 · ANS: The error arises because Flask requires a specific format for view function outputs to generate an HTTP response. If your view function is returning something unexpected, such as the boolean True, you need to adjust it to one of the accepted types.
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