If you didn’t know, CORS - or Cross-Origin Resource Sharing - is a W3C specification for allowing a page loaded from one domain to access resources on a different domain via XMLHttpRequest calls. This is important for a number of reasons, but the main one for me right now is because it means that you can split your application into multiple smaller services - microservices - that are hosted on different subdomains and still access them all from your Javascript.
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