XRootD implementation sends firefly only to central collector and not to the real destination using same network path as transferred data
useful to test collector and may be to start with some basic monitoring interface
not very useful when it comes to probes that capture passing firefly packets
very limited functionality - current implementation not really for wider deployment
passing experiment activity is tricky and needs to be implemented
for HTTP-TPC (HTTP COPY operation) it might be useful to use TransferHeader prefix, because these headers (with stripped TransferHeader prefix) are passed also to passive party
TransferFlowExp -> TransferHeaderFlowExp (passive party gets FlowExp header)
TransferFlowAct -> TransferHeaderFrowAct (passive party gets FlowAct header)
experiments should provides list of activities they consider useful for packet marking