RequestFailureFlow is used as the failure flow in the default request flow of Access Gateway mediations.
As the figure shows, a typical RequestFailureFlow subflow includes an input node (in) followed by a sequence of TWSS mediation primitives and an output node (out). In TWSS default flows, if a failure occurs during the execution of a RequestCommonFlow or RequestCommonFlowWithGR subflow, then RequestFailureFlow is invoked to handle the fault condition.