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Non-decorator version of the :meth:`errorhandler` error attach
function, akin to the :meth:`~flask.Flask.register_error_handler`
application-wide function of the :class:`~flask.Flask` object but
for error handlers limited to this blueprint.

.. versionadded:: 0.11

src/f/l/flask-HEAD/flask/testsuite/blueprints.py   flask(Download)
            self.assert_true(isinstance(e, MyFunctionException))
            return 'bam'
        blue.register_error_handler(MyFunctionException, my_function_exception_handler)
 
        @blue.route('/decorator')