(Last time, we did two experiments of HTTP protocol in the environment of machine minimization, captured packets with Wireshark, and figured out the basic workflow of HTTP protocol, that is, "request response", "one send and one receive" mode.HTTP works in a very simple way. Since the specific transmission work of the bottom layer is in the charge of TCP / IP protocol, HTTP protocol basically doesn't need to worry too much in this regard. From this point of view alone, the so-called "hypertext transmission protocol" doesn't care about "transmission" at all, which is a bit "untrue".So what is the core of HTTP protocol?The answer is the content of the message it transmits.HTTP protocol defines the message format in detail in the specification document, and specifies the components, parsing rules and processing strategies. Therefore, it can realize more flexible and rich functions in TCP / IP layer, such as connection control, cache management, data coding, content negotiation, etc)
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