The Ultimate Guide to Enabling Cross-Origin Resource Sharing (CORS)

The Ultimate Guide to Enabling Cross-Origin Resource Sharing (CORS)

Curious about what the Cross-Origin Resource Sharing (CORS) policy is exactly and why you might face this error so often? Learn everything you need to know about it here.

Curious about what the Cross-Origin Resource Sharing (CORS) policy is exactly and why you might face this error so often? Learn everything you need to know about it here.

Consider the following situation: you’re trying to fetch some data from an API on your website using fetch() but end up with an error.

You open up the console and see either “No Access-Control-Allow-Origin header is present on the requested resource,” or “The Access-Control-Allow-Origin header has a value <some_url> that is not equal to the supplied origin” written in red text, indicating that your request was blocked by CORS policy.

Blocked Request due to CORS

Seem familiar? With over 10,000 questions posted under the cors tag on StackOverflow, it is one of the most common issues that plague frontend developers and backend developers alike. So, what exactly is the CORS policy and why do we face this error often?

What is Cross-Origin Resource Sharing (CORS)?

Interestingly, this is not an error as we portray it, but rather the expected behavior. Our web browsers enforce the same-origin policy, which restricts resource sharing across different origins. Cross-origin resource sharing, or CORS, is the mechanism through which we can overcome this barrier. To understand CORS, let us first understand the same-origin policy and its need.

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