(In the first two lectures, we learned the components of the request line in the HTTP message, including the request method and ur. Using the request line, add the following header fields to form the request header, which can be sent to the server through TCP / IP protocol.The server receives the request message and needs to process it after parsing. The specific business logic is varied, but in the end, you still have to spell out a response message and send it back to the client.The response message consists of the response header and the response body data. The response header consists of the status line and the header field.)
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