Rest what is

By 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. Statelessness mandates that each request from the client to the server must contain all of the information necessary to understand and complete the request. The cacheable constraint requires that a response should implicitly or explicitly label itself as cacheable or non-cacheable.

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 layered system style allows an architecture to be composed of hierarchical layers by constraining component behavior. For example, in a layered system, each component cannot see beyond the immediate layer they are interacting with.

REST also allows client functionality to extend by downloading and executing code in the form of applets or scripts. The downloaded code simplifies clients by reducing the number of features required to be pre-implemented.

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

The state of the resource, at any particular time, is known as the resource representation. REST uses resource identifiers to identify each resource involved in the interactions between the client and the server components. The data format of a representation is known as a media type. The media type identifies a specification that defines how a representation is to be processed. Every addressable unit of information carries an address, either explicitly e.

Hypertext or hypermedia means the simultaneous presentation of information and controls such that the information becomes the affordance through which the user or automaton obtains choices and selects actions.

Machines can follow links when they understand the data format and relationship types. Further, resource representations shall be self-descriptive : the client does not need to know if a resource is an employee or a device. It should act based on the media type associated with the resource. So in practice, we will create lots of custom media types — usually one media type associated with one resource.

Every media type defines a default processing model. For example, HTML defines a rendering process for hypertext and the browser behavior around each element. Another important thing associated with REST is resource methods. These resource methods are used to perform the desired transition between two states of any resource. A large number of people wrongly relate resource methods to HTTP methods i. Roy Fielding has never mentioned any recommendation around which method to be used in which condition.

All he emphasizes is that it should be a uniform interface. Still, the application interface will be RESTful. Ideally, everything needed to transition the resource state shall be part of the resource representation — including all the supported methods and what form they will leave the representation. Roy fielding, in his dissertation, has nowhere mentioned any implementation direction — including any protocol preference or even HTTP.

The resources are acted upon by using a set of simple, well-defined operations. The clients and servers exchange representations of resources by using a standardized interface and protocol.

Metadata about the resource is made available and used to control caching, detect transmission errors, negotiate the appropriate representation format, and perform authentication or access control. Regarding the 6th guiding principle — coding on demand, does this include single page application in which code is downloaded from a server to the UI when invoked?

I suggest never use camel case notation. You should use all lowercase separated with hyphens. It helps in SEO. Maybe using lowercase seperated with hyphens is better to read. Not at all.

I struggle to comprehend this without an example. Let us say, our API is supposed to retrieve data, such as employee data from database server in JSON format to be consumed by client app. Maybe someone can explain or give an example of the above statement, preferably using Laravel routing statement. If we will provide full device information in search query results, the client may start using these URIs to get and utilize individual device information — Which is wrong.

Thanks for your reply. When you discuss two resource types there, i. Thanks again. User management Certification Central. Register now Not registered yet? Here are a few reasons why you should be: Browse Knowledgebase articles, manage support cases and subscriptions, download updates, and more from one place.

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Jump to section. Learn more about APIs. Design tips for microservices developers. Stateless client-server communication, meaning no client information is stored between get requests and each request is separate and unconnected. Cacheable data that streamlines client-server interactions. A uniform interface between components so that information is transferred in a standard form. This requires that: resources requested are identifiable and separate from the representations sent to the client.

A layered system that organizes each type of server those responsible for security, load-balancing, etc. Code-on-demand optional : the ability to send executable code from the server to the client when requested, extending client functionality. Learn more. A comprehensive set of integration and messaging technologies.