Regularly unhandled exceptions consistently reporting an HTTP Exception: "Cannot redirect after HTTP headers have been sent" warnings are being noted multiple times per day.
An error is seen regularly in the event viewer logs:
"Event code: 3005 Event message: An unhandled exception has occurred. Exception information: Exception type: HttpException Exception message: Cannot redirect after HTTP headers have been sent."
This issue is being investigated and reviewed for future release of the product: "K2Blackpearl Form WorklistControl - 'Cannot redirect after HTTP headers have been sent.'"
These warnings in Event Viewer is not something to be worried about - especially if K2 is functioning fine.
Referencing article: https://social.technet.microsoft.com/Forums/Azure/en-US/bd630981-49ff-4113-bb6a-173dcc6829e7/401-unauthorized-problem-fba?forum=sharepointadminlegacy