apache - Why http client responds to a [FIN, ACK] with a [ACK], (without responding a [FIN, ACK])? -

apache - Why http client responds to a [FIN, ACK] with a [ACK], (without responding a [FIN, ACK])? -

server sends [fin, ack] after connection timeout, client responds [fin, ack] , collection closed properly. client responds [ack] , seek send info server.

can please explain why sometime client responds [ack]?

apache http tcp httpconnection