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CORS- Cross-Origin Resource Sharing.

It is header-based mechanism that allows a server to indicate any origins like scheme, domain, or port other than its own from which a browser should permit loading resources.

In order to check that the server will permit the actual request, CORS also relies on a mechanism by which browsers make a “preflight” request to the server hosting the cross-origin resource.

The browser sends headers that indicate the HTTP method and headers that will be used in the actual request in Preflight.

Browsers restrict cross-origin HTTP requests initiated from scripts for security purposes.

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.

Data transfers between browsers and servers and CORS mechanism supports secure cross-origin requests.

This article is for front-end developers, web administrators and server developers.

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