What is HTTP

  Original Name of HTTP is HTTP/2,

HTTP

HTTP means Hyper Text Transfer Protocol. It's used to exchange text, graphic images, audio, video and other multimedia files over the World Wide Web (WWW). The latest version of HTTP is HTTP 1.1, 2 and default port no is 80. This protocol used in the application layer.

It is a connection-less protocol. HTTP is the protocol used to access resources, usually Web sites present on the Internet. HTTP uses TCP-Transmission Control Protocol, for transmission of data between the user's computer and the Website. When a keys in the URL -Uniform Resource Locator of a Website in the browser's address bar, an HTTP request is generated. The browser is an HTTP client, and requests of HTTP clients are handled by the HTTP daemon (here, a daemon is a software program that continuously runs on a computer server) that resides on the Web Server. A Web server is a computer on which the files pertaining  to a Web site are located. once the HTTP daemon accepts the client request, the user can view the Web page in the browser.

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For example,
if a user types the URL https://gpsacademy.blogspot.com/, the browser generates an HTTP request and contacts the Web server. The HTTP daemon processes the request and may or may not accept it. Usually, most Web site allow public access and therefore the requests are accepted. Certain Web sites, however contain private information and are not accessible to all users. Such Web sites may ask the user to enter a username and password (which would be pre-assigned by the Web site administrator) to access the website.

However, HTTP uses TCP/IP, for data transfer between the two connected Computers. In addition  HTTP is a stateless protocol. A stateless protocol means that the connection between the two Computers is terminated as soon as a data transfer ends. As a result, every time a user requests data from a Web site, a new connection is established. 

Hyper Text Transfer Protocol Secure (HTTPS)

HTTP is used to handle data transfers over the Internet. It is possible that confidential data, the security of which cannot be compromised, is being transmitted, for example, users may use credit cards to shop online.However , credit cards information is very sensitive and needs to be protected.To ensure secure transmission of data over the Internet, HTTPS (HTTP over Secure Socket Layer) was introduced. HTTPS encrypts all data that travels over the Internet so that the data is not read by unauthorized sources. The data is decrypted by the Web Server so that the information is read only by the Web server.

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Thanks a lot for reading!
Neel Kamal