How do you use Sentry?

Sentry Saas (sentry.io)

Version

1.5.6

Steps to Reproduce

1. Attach a custom exception handler:

import marshmallow

def marshmallow_validation_error_handler(req, res, exc, params):
    """Transforms a marshmallow validation error into the appropriate HTTP response."""
    raise falcon.HTTPError(400)

api.add_error_handler(marshmallow.ValidationError, marshmallow_validation_error_handler)

2. Do an API request that leads to a validation error

Expected Result

The marshmallow exception should not have been reported to Sentry.

Actual Result

The custom exception leads to a 4xx, not a 5xx, yet it is still reported as an unhandled error on Sentry.