AWS API Gateways CORS error

Question

I am stuck with this error: 'Access to fetch at “https://xxxx’ from origin ‘http://localhost:3000’ has been blocked by CORS policy: localhost/:1 Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. If an opaque response serves your needs, set the request’s mode to ‘no-cors’ to fetch the resource with CORS disabled.'

Accepted Answer

Hi,

As described on the [AWS documentation](https://docs.aws.amazon.com/apigateway/latest/developerguide/how-to-cors.html), Cross-origin resource sharing (CORS) is a browser security feature that restricts cross-origin HTTP requests that are initiated from scripts running in the browser. In your case, from localhost to the API Gateway domain.

In order to fix it, your API response must include the `Access-Control-Allow-Origin` header, with the allowed domain name as value.

Thus, I recommend you take a look at the following  [Knowledge Center article](https://repost.aws/knowledge-center/api-gateway-cors-errors), which described step by step how to troubleshoot the No ‘Access-Control-Allow-Origin’ header present CORS error, describing the possible causes as well as how to solve it for both HTTP and REST APIs.

AWS API Gateways CORS error

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