Catching a 500 server error in Flask

Question

I love Flask's error catching. It's beautifully simple:

@app.errorhandler(404) def pageNotFound(error):     return "page not found" 

works like charm. But it doesn't work for the 500 error code. I want to catch Python errors when something goes wrong an exception is raised in the code. Is that possible?

I should note that if I explicitly call return abort(500) in a view then the 500 errorhandler does work. So this is explicitly for when the Python code fails.

Is this possible?

Answer 1

What you have described is, by default, how Flask works. My assumption is that you are running in debug mode, and therefore exceptions are being shown to you in the debug screen. Make sure debug mode is off, then try again. Here is a comment directly from the code itself:

Default exception handling that kicks in when an exception occurs that is not caught. In debug mode the exception will be re-raised immediately, otherwise it is logged and the handler for a 500 internal server error is used. If no such handler exists, a default 500 internal server error message is displayed.