client marks the bit flags to send syn = 1, the
server replies ack = 1 and syn = 1 after receiving the reply, and the
client sends ack = 1 to the server to complete the three-way handshake after receiving the reply.
then send the http request ack = 1 and psh = 1, and wrap the http request format in the data body and send it to the server
server after processing, reply ack = 1 and psh = 1, and attach the http response format.
it seems that Baidu encyclopedia has an explanation of "three-way handshake", which will be a little more detailed
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