(In the previous lecture, I introduced five basic features of HTTP. In this lecture, I will talk about its advantages and disadvantages. In fact, these should also be regarded as HTTP features, but this lecture will focus more on evaluating their advantages and disadvantages.I also left two homework for the first class. I wonder if you have seriously considered it. Today, we can see if your answer is consistent with my views and ideas, and discuss it together.But before I begin, I would like to remind you that today's discussion is limited to http / 1.1, and the advantages and disadvantages mentioned are only for HTTP / 1.1. In fact, HTTPS and HTTP / 2, as will be mentioned later, are the advantages and disadvantages of HTTP / 1.1.)