Interactive: end-to-end between an active agent (e.g. a person) and a backend.
Separation between client and server. Communication between the two is synchronous in the form of request–response.
Statelessness communication: every request from client to server must contain all the information necessary for the server to serve the request. The server should not store context of ongoing interaction; session state is on the client.
Uniform interface: clients and servers handle resources, which have unique identifiers. Resources are operated on with a restrictive interface consisting of creation, modification, ...
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