(Through the previous lectures in the basics, you should have understood the basic knowledge of HTTP protocol, its message structure, request header, response header, as well as its internal request method, URI and status code.Do you have any doubts: "HTTP protocol seems very simple, why can it rule the Internet for so many years?"In the next two classes, I will talk to you about the characteristics, advantages and disadvantages of HTTP protocol. It is necessary to see its good side and bad side. Only by understanding HTTP in an all-round and multi angle way can we "develop strengths and avoid weaknesses" and make better use of HTTP.Today's class mainly focuses on the characteristics of HTTP protocol, but it won't talk about their good or bad. These features may be advantages or disadvantages. You can listen and think.)