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REpresentational State Transfer (REST) is an architectural style that defines a set of constraints to be used for creating web services. REST API to sposób na dostęp do usług internetowych w prosty i elastyczny sposób bez konieczności przetwarzania.
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REST uses less bandwidth, simple and flexible making it more suitable for internet usage. It’s used to fetch or give some information from a web service All communication done via REST API uses only HTTP request.
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A request is sent from client to server in the form of web URL as HTTP GET or POST or PUT or DELETE request. After that, a response comes back from server in the form of a resource which can be anything like HTML, XML, Image or JSON. But now JSON is the most popular format being used in Web Services.
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method is used to read (or retrieve) a representation of a resource. In the safe path, GET returns a representation in XML or JSON and an HTTP response code of 200 (OK). In an error case, it most often returns a 404 (NOT FOUND) or 400 (BAD REQUEST).
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verb is most-often utilized to create new resources. In particular, it’s used to create subordinate resources. That is, subordinate to some other (e.g. parent) resource. On successful creation, return HTTP status 201, returning a Location header with a link to the newly-created resource with the 201 HTTP status. NOTE: POST is neither safe nor idempotent.
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It is used for updating the capabilities. However, PUT can also be used to create a resource in the case where the resource ID is chosen by the client instead of by the server. On successful update, return 200 (or 204 if not returning any content in the body) from a PUT. If using PUT for create, return HTTP status 201 on successful creation. PUT is not safe operation but it’s idempotent.
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request only needs to contain the changes to the resource, not the complete resource. This resembles PUT, but the body contains a set of instructions describing how a resource currently residing on the server should be modified to produce a new version. This means that the PATCH body should not just be a modified part of the resource, but in some kind of patch language like JSON Patch or XML Patch. PATCH is neither safe nor idempotent.
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It is used to delete a resource identified by a URI. On successful deletion, return HTTP status 200 (OK) along with a response body.
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An idempotent HTTP method is a HTTP method that can be called many times without different outcomes. It would not matter if the method is called only once, or ten times over. The result should be the same. Again, this only applies to the result, not the resource itself
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Architectural constraints start learning
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There are six, Uniform Interface Stateless Cacheable Client-Server Layered System Code on Demand
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