per review
@ -212,7 +212,7 @@ class IPythonHandler(AuthenticatedHandler):
"""render custom error pages"""
exception = kwargs.get('exception')
message = ''
status_message = responses.get(status_code, 'Unknown')
status_message = responses.get(status_code, 'Unknown HTTP Error')
if exception:
# get the custom message, if defined
try: