CORS issue doesn’t occur when using POSTMAN

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From Cross-Origin XMLHttpRequest in Chrome Develop Extensions documentation:

Regular web pages can use the XMLHttpRequest object to send and receive data from remote servers, but they’re limited by the same origin policy. Extensions aren’t so limited. An extension can talk to remote servers outside of its origin, as long as it first requests cross-origin permissions.

Basically browser extensions have more privileges than web content. In the case of Chrome extensions, there is an option to enable cross-origin access.

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