HyperText Transfer Protocol – HTTP

The HyperText Transfer Protocol (HTTP) is an application protocol used for transmitting and receiving information across the World Wide Web. It defines the rules and conventions for how web servers and clients (such as web browsers) communicate and exchange data.

Key aspects of the HyperText Transfer Protocol include:

1. Client-Server Communication: HTTP enables communication between a client (such as a web browser) and a server (where web content is hosted). A client initiates a request to the server, and the server responds with the requested data.
2. Stateless Protocol: HTTP is stateless, meaning it doesn’t retain information about previous interactions. Each request from the client to the server is independent and does not contain any knowledge of past requests, unless mechanisms like cookies or sessions are used to maintain state.
3. Request-Response Cycle: A typical HTTP transaction involves a request from the client and a response from the server. The client sends an HTTP request message to the server, specifying the desired action (e.g., retrieving a webpage, submitting form data). The server processes the request and sends back an HTTP response message containing the requested data or indicating an error.
4. Protocol Methods (HTTP Verbs): HTTP defines various methods or verbs that indicate the action to be performed on a resource. The most commonly used methods include:
   • GET: Requests data from a specified resource.
   • POST: Submits data to be processed to a specified resource.
   • PUT: Updates a resource or creates a new resource.
   • DELETE: Deletes a specified resource.
5. URL Structure: HTTP uses Uniform Resource Locators (URLs) to identify resources on the web. URLs consist of a protocol identifier (e.g., http://), a domain name or IP address, and a path to the specific resource on the server.
6. Security: HTTP alone does not provide encryption or secure data transmission. For secure communication, HTTPS (HTTP Secure or https://) utilises encryption through SSL/TLS protocols to protect data transmitted between the client and server.