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REST usesВ resource identifiersВ to identify each resource involved in the interactions between the client and the server components. This set of resources is known as the REST APIвЂ™s resource model. and the hypermedia linksВ that can help the clients in transition to the next desired state.ДЄ REST API consists of an assembly of interlinked resources.The resource representations are consist of: The state of the resource, at any particular time, is known as the resource representation. For example, a REST resource can be a document or image, a temporal service, a collection of other resources, or a non-virtual object (e.g., a person).

Any information that we can name can be a resource. The key abstraction of informationВ in REST is a resource. Servers can provide part of features delivered to the client in the form of code, and the client only needs to execute the code.

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The downloaded code simplifies clients by reducing the number of features required to be pre-implemented. REST also allows client functionality to extend by downloading and executing code in the form of applets or scripts. The layered system style allows an architecture to be composed of hierarchical layers by constraining component behavior.ДЇor example, in a layered system, each component cannot see beyond the immediate layer they are interacting with. If the response is cacheable, the client application gets the right to reuse the response data later for equivalent requests and a specified period. The cacheable constraintВ requires that a response should implicitly or explicitly label itself as cacheable or non-cacheable. The server cannot take advantage of any previously stored context information on the server.ДЇor this reason, the client application must entirely keep the session state. StatelessnessВ mandates that each request from the client to the server must contain all of the information necessary to understand and complete the request. While the client and the server evolve, we have to make sure that the interface/contract between the client and the server does not break. The client-server design pattern enforces the separation of concerns, which helps the client and the server components evolve independently.Д«y separating the user interface concerns (client) from the data storage concerns (server), we improve the portability of the user interface across multiple platforms and improve scalability by simplifying the server components. The client application should dynamically drive all other resources and interactions with the use of hyperlinks.

Hypermedia as the engine of application stateВ вЂ“ The client should have only the initial URI of the application.

It should also provide information of the additional actions that the client can perform on the resource.

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Self-descriptive messagesВ вЂ“ Each resource representation should carry enough information to describe how to process the message.

API consumers should use these representations to modify the resources state in the server.

Manipulation of resources through representationsВ вЂ“ The resources should have uniform representations in the server response.

Identification of resourcesВ вЂ“ The interface must uniquely identify each resource involved in the interaction between the client and the server.

The following four constraints can achieve a uniform REST interface: Multiple architectural constraints help in obtaining a uniform interface and guiding the behavior of components. Uniform InterfaceД«y applying the principle of generalityВ to the components interface, we can simplify the overall system architecture and improve the visibility of interactions. The six guiding principles or constraints of the RESTful architectureВ are: 1.1. These principles must be satisfied if a service interface needs to be referred to as RESTful.ДЄ Web API (or Web Service) conforming to the REST architectural style is a REST API. Like other architectural styles, REST has its guiding principles and constraints. Roy Fielding first presented it in 2000 in his famous dissertation. REST is an acronym for REpresentational State Transfer and an architectural style for distributed hypermedia systems.