http

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School

North Carolina State University *

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Course

401

Subject

Information Systems

Date

Oct 30, 2023

Type

pdf

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1

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HTTP (HyperText Transfer Protocol) HTTP, or HyperText Transfer Protocol, operates at the applicaƟon layer and serves as the foundaƟon for any data exchange on the Web. It is a request-response protocol used for transmiƫng hypertext over a network, most commonly used over TCP/IP. HTTP defines how messages are formaƩed and transmiƩed and how web servers and browsers should respond to various commands. When you access a web page, your browser iniƟates an HTTP request to a web server. The server then returns an HTTP response, typically consisƟng of the content of the web page, which is then rendered by your browser. HTTP operaƟons are stateless, meaning each request-response pair is independent and no state is stored between successive interacƟons. This is where concepts like cookies come into play, enabling stateful sessions. HTTP supports various methods for different operaƟons, the most common being GET (retrieve data), POST (send data), PUT (update data), and DELETE (remove data). The protocol also includes status codes in the response to indicate the outcome of the request, like 200 for success, 404 for not found, etc. The protocol has evolved over the years, with HTTP/2 and HTTP/3 introducing improvements like mulƟplexing, header compression, and the use of UDP in the case of HTTP/3, to improve speed and efficiency. Each of these protocols—TCP, UDP, and HTTP—serves unique roles within the networking landscape, offering a range of opƟons for different types of applicaƟons and services.
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