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please see the following pic:
the client initiate a half-close request and get acknowledged,if i dont misunderstand what half-close means,the client should not be able to send any data afterwards, then how can it send back an ACK later.
It’s not the client data that is being sent, it the acknowledgement for the server data received after client does
shutdown( fd, SHUT_WR ), which means client will not send anymore, but can still receive. TheACKitself is part of the transport protocol, not the application.