(This lecture is the first lecture of "advanced chapter". Starting today, I will use eight consecutive classes to analyze various header fields in HTTP protocol in detail, including definition, function, usage method, precautions, etc. After completing these courses, you will be able to fully master the HTTP protocol.In the previous "Basics", we learned about the structure of HTTP packets and knew that an HTTP packet isIt consists of "title + body". But at that time, we mainly studied the head, not the body. Therefore, the first lecture of advanced chapter starts from the text of HTTP.)
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