Proper cache management streamlines client-server interactions by partially or totally eliminating some, further enhancing performance and scalability. This prevents the API client from providing stale, cached data in response to further requests. The API server response must define itself as cacheable or uncacheable when presented to the client. Statelessness eliminates server load caused by storing previous requests and responses, making REST APIs reliable, fast and scalable.Ĭacheability Most API client machines and intermediaries can cache server responses. The server should also respond with a message the client can completely understand without contextual information from previous session packets. To achieve statelessness, each client request must contain all information the server needs to know about the resource and operation without seeing previous messages. Stateless interface RESTful APIs are stateless, meaning the server does not need to know the client’s state and vice versa. This decoupling also allows each component to evolve independently. The separation of client and server improves cross-platform interface flexibility by simplifying the development of server components. So long as the client and server agree on the message transmission format, they can be kept modular and separate. The code/programming language and implementation on the client side can be altered anytime without affecting how the server behaves and vice versa. The client should only access the initial application URI, using dynamic hyperlinks to access and manipulate resources.ĭecoupling the client and the server REST APIs enforce the separation of concerns by enabling the independent implementation of the client and the server.Each representation should have detailed information describing how clients/servers can process the message body.All resources should have uniform representations, which the API server can use to manipulate the resource state.The ability of each interface to uniquely identify all resources involved in interactions between the API client and the server.A uniform REST interface is achieved using four design constraints: The design of a RESTful API calls for the application of the generality to the component interface for simpler overall architecture and observability. Uniform interface REST APIs are built to provide visibility for interactions between microservices. Some design constraints that guide the building of REST APIs include: The response body also includes a response code that notifies the client about the success status of the API operation. The API server sends a data payload to the requesting client, including a content-type header that specifies the message transmission format used in the response body. The client specifies the data formats they can receive within the Accept field within the header. REST APIs use HTTP verbs: GET, POST, PUT and DELETE, to perform resource Creation, Reading, Updating and Deletion (CRUD) operations. An optional message body with client data.A header that describes information about the resource request.A HTTP method that defines the operation to be performed on the resource.This payload is a representation of the resource that the client requested. In a RESTful API, the client makes a request to a Uniform Resource Locator, which triggers a response whose payload is formatted in JSON, HTML, XML, or any other accepted data formats. The REST API framework has been widely adopted in modern web development for building stateless, scalable, and reliable APIs. Systems that obey REST constraints are referred to as RESTful.Ī RESTful web API uses URL-encoded parameters to access resources using HTTP methods. It is an implementation of modern architectural styles that rely on a set of constraints to enable data exchange in hypermedia systems. REST is an acronym for Representational State Transfer.
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