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Same Origin Policy

In early web development it was assumed that a website was only going to receive ajax request from the same server that the site was severed from.

Origin : protocol domain url : https://example.com

Modern Web

In the modern web a website makes calls to many different servers for all sorts of resources. For example fonts, styling, images, and api data to name a few. These are cross origin calls.

The solution to enable cross origin requests in a more efficient way was http headers. For example a public server would add a CORS related header to the response and the client would determine if the response from the server was safe.

Access-Control-Allow-Origin: 'http://example.com'

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