HTTP(Hyper Text Transfer Protocol):-It is the communication protocol that is normally used by your browser to communicate with websites.
Port:-A port is a door through which data enters or leaves your computer.Ports are used to exchange data between different devices.There are two types of ports:
-Hardware ports:-All of us use hardware ports like USB ports,parallel ports,Ethernet port.These are normally used to exchange data between two devices.
-Virtual ports:-All web applications on your computer open something known as virtual ports on your computer to communicate with servers on the internet.Without virtual ports there would be no way for applications on your computer to communicate with remote servers on the internet.You can find a list of open virtual ports on your computer by simply going to the MSDOS prompt and typing the command netstat-n.
Proxy server:-A proxy server is a server or software that acts as an intermediary between a user and the internet.Whenever a user sends a request for a webpage to a proxy server,the proxy server will forward that request to the relevant server on the internet and then send back the response to the user.
step 1---USER-->sends request for a webpage-->PROXY
step 2---PROXY-->sends same request to relevant website-->WEBSITE
step 3---WEBSITE-->sends back requested page-->PROXY
step 4---PROXY-->sends back request page-->USER.
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