Check Http Context Status Processor

In between a HandleHttpRequest and HandleHttpResponse a lot can happen. If the flow is long running it would be nice to know if the HTTP Context is still valid, or if the user terminated the connection.  This is especially useful before starting a long running process, or if a FlowFile has been queued for a long period of time.

Suggest creating a "CheckHttpContext" Processor that will route FlowFile's to relationships such as "Valid" if the connection is still good, or "invalid"/"expired".