Methods, systems and computer program products for tracking, encoding and decoding the code-location of runtime events. The system modifies a request packet to access a resource initiated by a source address to indicate the request packet was sent by an intermediary address. The system injects an identifier pre-allocated for the source address into the request packet. The system updates the modified request packet by replacing the intermediary address with a substitute address that corresponds with the source address' pre-allocated identifier. The system sends the updated request packet to the resource, the updated request packet indicating a response to the updated request packet is to be sent back to the substitute address.