Better example of JsonPayload use

        Method to call when an HTTP POST request is made. 

        Assumes request will include a JSON payload.

        """

        # Get payload JSON as a dictionary

        # Get payload JSON

        payload = JsonPayload(request)

        # Extract a value from the JSON key 'plugin_string'. If no value is given, default to None

        new_plugin_string = payload.param('plugin_string')

        # Extract a value from the JSON key 'plugin_string', and convert to a string. If no value is given, default to empty.

        new_plugin_string = payload.param('plugin_string', default='', convert=str)

        if new_plugin_string:  # If not None or empty

            # Set microscope attribute to the specified string