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HTTP

   HTTP:-
-Http stands for hypertext transfer   protocol.
-It is an application layer protocol.
-The http is a set of rules for exchanging  files(text, graphics,video, record,images  and other multimedia files) on the   Www(world wide web).
-It is an access method to access web   pages used on the internet .
-Http is a part of protocol framework   called the internet protocol suite ,which   includes TCP/IP .
-Http uses port number 80.
Components of Http based system:-
Http is a client server protocol , requests are send by one entity,the web user agent.Most of the time the user agent is a web browser. Generally 3 components are in http based based system.Like client, server and proxy .
Client and server:-
A server is a computing program or device that accepts and responds to requests made over a network.The device the sends request to the server and get response from the server,is called a client.Server sends the requested information to the client. 
Proxy:-
- Between the server and web browser, numerous computer and machines relay the http messages.Those operation at the application layers are called proxies.It could be Router,gateway, firewall etc.Proxies can perform numerous functions such as cashing, filtering, authentication etc.

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