The server includes specific HTTP headers (like Access-Control-Allow-Origin) in its responses to tell the browser that it's okay to allow requests from different origins. Without CORS, your React app wouldn't be able to fetch this data due to the Same Origin Policy.īut with CORS enabled on the server-side, your React app can freely request resources from this API. For example, let's say your React app is running on and it needs to fetch data from an API running on These two have different origins because they're running on different ports. In the context of a React app, CORS comes into play when your app needs to request resources from a different origin. It's a technology that allows your web app to break free from the restrictions of the Same Origin Policy, which is a security measure that prevents resources from different origins from interacting with each other. Access-Control-Allow-Origin is a CORS header. So, let's get started!ĬORS, or Cross-Origin Resource Sharing, is a mechanism that allows many resources (e.g., fonts, JavaScript, etc.) on a web page to be requested from another domain outside the domain from which the resource originated. The CORS specification identifies a collection of protocol headers of which Access-Control-Allow-Origin is the most significant. By the end of this post, you'll be a CORS wrangling pro, ready to tackle any CORS issue that comes your way. The cross-origin resource sharing (CORS) specification prescribes header content exchanged between web servers and browsers that restricts origins for web resource requests outside of the origin domain. We'll also delve into common CORS errors in React and how to handle them, and we'll walk you through how to enable CORS in your React app. Access-Control-Allow-Credentials Access-Control-Allow-Headers Access-Control-Allow-Methods Access-Control-Expose-Headers Access-Control-Max-Age Access-Control-Request-Headers Access-Control-Request-Method Origin These headers are all important, but let’s we focus on the following header: Access-Control-Allow-Origin You should define. We'll explore what CORS is, why it's important, and how it relates to the Same Origin Policy. When loading React (or other libraries that might throw errors) from a CDN, add the crossorigin attribute to your
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