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• Client-Server: a pull-based interaction style.

• Stateless: each request from client to server must contain all the information necessary to understand the request, and cannot take advantage of any stored context on the server.

• Cache: to improve network efficiency responses must be capable of being labeled as cacheable or non-cacheable.

• Uniform interface: all resources are accessed with a generic interface (e.g., HTTP GET, POST, PUT, DELETE).

• Named resources: the system is comprised of resources that are named using a URL.

• Interconnected resource representations: the representations of the resources are interconnected using URLs, thereby enabling a client to progress from one state to another.

• Layered components: intermediaries, such as proxy servers, cache servers, and gateways, can be inserted between clients and resources to support performance, security, and so on,.