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What is Cross-Origin Resource Sharing (CORS)? Cross-Origin Resource Sharing (CORS) is an HTTP-header based mechanism that allows a server to indicate any origins (domain, scheme, or port) other than its own from which a browser should permit loading resources. CORS also relies on a mechanism by which browsers make a "preflight" request to the server hosting the cross-origin resource, in order to check that the server will permit the actual request. In that preflight, the browser sends headers that indicate the HTTP method and headers that will be used in the actual request. For security reasons, browsers restrict cross-origin HTTP requests initiated from scripts. For example, XMLHttpRequest and the Fetch API follow the same-origin policy. This means that a web application using those APIs can only request resources from the same origin the application was loaded from unless the response from other origins includes the right CORS headers.
What is an API and how is it used? API is the acronym for Application Programming Interface, which uses HTTP protocol and that allows two applications to talk to each other, send an instant message.
What is a REST based API? A RESTful API is an architectural style for an application program interface (API) that uses HTTP requests to access and use data. The API spells out the proper way for a developer to write a program requesting services from an operating system or other application.