Changing default status message from pivot


I am trying to change the default status for invalid druid requests made through pivot (imply pivot). I am using a custom service that filters requests based on some conditions (for example, hyperUnique requests for interval greater than 7 days). I am trying to show a custom error message for each type of filter. Right now, it appears to me that pivot overwrites the default status message to ‘Bad Status Code’. Is it possible to set custom status/error messages in pivot to filter out large run time/invalid requests?