HTTP (Hypertext Transfer Protocol)

HTTP (Hypertext Transfer Protocol) is the core communication protocol used for exchanging data across the web. It defines how browsers and servers request and deliver resources such as HTML pages, images, APIs, and other digital objects. HTTP is text-based, stateless, and built on a request–response model, making it highly adaptable for web applications and for integrating with enterprise systems.

The protocol includes several essential mechanisms:

• Methods: Actions such as GET, POST, PUT, and DELETE are used to interact with resources.

• Headers: Key–value pairs controlling metadata, authentication, and content format.

• Status codes: Indicators such as 200 (OK), 404 (Not Found,) and 500 (Server Error).

• Session handling: Cookies or tokens are used to maintain state due to HTTP’s stateless nature.

• Security: HTTPS adds SSL/TLS encryption to ensure confidentiality and integrity.

Developed in the early 1990s as part of the World Wide Web project, HTTP evolved from the simple HTTP/0.9 to the widely adopted HTTP/1.1. Newer versions—HTTP/2 and HTTP/3—provide major performance improvements through binary framing, multiplexing and the QUIC transport protocol.

Microsoft technologies such as Azure, Dynamics 365, and .NET rely heavily on HTTP for APIs, integrations, and web services. Azure API Management, Logic Apps, and Business Central APIs use HTTP-based calls as a foundation for secure and scalable communication.

HTTP remains the cornerstone of web communication and integration. With its standard methods, status codes and security extensions, the protocol provides a robust and flexible framework for data exchange across modern IT architectures.