Cross-Origin Resource Sharing (CORS)

Cross-Origin Resource Sharing (CORS) is a way to let applications running on one domain access content from another domain, for example, letting make requests to

If CORS isn't set up properly, you're likely to get errors that look like this:

XMLHttpRequest cannot load
No 'Access-Control-Allow-Origin' header is present on the requested resource.
Origin '' is therefore not allowed access.

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