To understand CORS, let us first understand the same-origin policy and its need. Cross-origin resource sharing, or CORS, is the mechanism through which we can overcome this barrier. Our web browsers enforce the same-origin policy, which restricts resource sharing across different origins. Interestingly, this is not an error as we portray it, but rather the expected behavior. So, what exactly is the CORS policy and why do we face this error often? What is Cross-Origin Resource Sharing (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. 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 that is not equal to the supplied origin” written in red text, indicating that your request was blocked by CORS policy. The ultimate guide to enabling Cross-Origin Resource Sharing (CORS)Ĭonsider the following situation: you’re trying to fetch some data from an API on your website using fetch() but end up with an error. I create user-centric websites with React, TypeScript, Node.js, and other JavaScript technologies. Nitin Ranganath Follow I'm a computer engineering student and an avid full-stack developer who loves to build for the web and mobile.
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