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I also don't understand why frameworks insist on returning debug data as part of the response. If you are working on something in a development cycle and need debug information, surely you have access to the server that's running in your console. I've always printed debug information there and then send the response. That prevents these kinds of leaks if the server is deployed with debug turned on.

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1. Pretty formatting of stack traces and other info, including making use of CSS and Javascript. For an extreme example, consider Werkzeug which allows stack frames to be inspected interactively in the tendered stack trace.

2. There are many situations where the person who we want to see the stack trace and debug output does not have access to the console output. E.g. hosting the service internally for a QA team.

In general, it is an error often made by people who focus on security to think that security considerations always trump convenience. In fact, it is a trade off like any other.

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