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Http

 

HyperText Transport Protocol is the communications protocol used to connect to servers on the World Wide Web. Its primary function is to establish a connection with a Web server and transmit HTML pages to the client browser.

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Hypertext Transfer Protocol

Hypertext Transfer Protocol abbreviated as HTTP is a protocol which contains a set of rules and convention for transmitting and exchanging files via the internet. It is coordinated by WWW i.e. World Wide Web Consortium. A file can be any file like text file, image files, query results or anything else. HTTP is a request and response standard of a client and a server. The basic communication is followed by sending a request from the client side and getting a response from the client side. Here HTTP servers are the Web Servers.

How HTTP Works:
  • An HTTP client opens a connection and sends a request message to an HTTP server.
  • The server then returns a response message.
  • The server closes the connection (making HTTP a stateless protocol.
Basic Structure of HTTP

Request message contains:

  • Request line , example : GET /images/logo.gif HTTP/1.1, which requests a resource called /images/logo.gif from server
  • Headers , example : Accept-Language: en
  • An empty line
  • An optional message body

There are eight Request methods:

  • HEAD provide information about the request or response.
  • GET Requests a representation of the specified resource.
  • POST request is used to send data to the server to be processed.
  • PUT Uploads a representation.
  • DELETE deletes the resource.
  • TRACE Echoes back the received request such that a client can see what intermediate servers are adding or changing in the request.
  • OPTIONS Returns the HTTP methods that the server supports for specified URL.
  • CONNECT Converts the request connection to a transparent TCP/IP tunnel.
HTTP & HTTPS

HTTPS stands for Hyper Text Transfer Protocol Secure. A web site starting with https//: means that your computer is talking to the website in a secure code that no one can eavesdrop on. The primary difference between http and https is with the default port which is 80 for http and 443 for https.

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