CORS
From Rice Wiki
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Same-origin policy
Before talking about CORS, we must first understand a security mechanism called the same-origin policy. This policy restricts how a document or script loaded by one origin can interact with a resource from another origin.
Two URLs have the same origin if they have the same protocol, port, and host.
This isolates potentially malicious documents. Consider a hacker website with a script that requests resources from our server. Since the hacker website does not have the same origin as us, they can't access our website by the same-origin policy.
Implementation
The same origin policy is implemented on the browser. It is built into the fetch API so that browsers will attach a Origin header to the request.
What is CORS
Cross-Origin Resource Sharing (CORS) allows server
