make server aware of data transfer complted

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hi..
i want to make the server aware of completion of data transfer to the client and wait to see whether client is making any new request or not (at same port).

like conversation:
CLIENT: hi //here i would like to tell the server that the client has sent the data and waiting for response and later again it can send to server
SERVER: hi
CLIENT: how are you?
SERVER: I am fine, thanks!
SERVER: What about you?
CLIENT: I am fine as well, thanks.