Describe a scenario in which a client could receive a reply from an earlier call.
What will be an ideal response?
Client sends request message, times out and then retransmits the request message, expecting only one reply. The server which is operating under a heavy load, eventually receives both request messages and sends two replies.
When the client sends a subsequent request it will receive the reply from the earlier call as a result. If request identifiers are copied from request to reply messages, the client can reject the reply to the earlier message.
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