(When we talked about the HTTP protocol earlier, we strictly followed the "request response" model of HTTP. In the protocol, only two roles communicate with each other, namely the "requester" browser (client) and the "responder" server.Today, we will introduce a new role for this model, HTTP proxy.After the introduction of HTTP proxy, the original simple two-party communication becomes more complex, adding one or more intermediaries, but on the whole, it is still a chain with sequential relationship, and the chain of two adjacent roles is still very simple. One to one communication, there will be no overstepping.)
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