What are CORS issues in fetch requests?

What are CORS issues in fetch requests?

CORS stands for Cross-Origin Resource Sharing. It's a security feature that restricts web pages from making requests to a different domain than the one that served the web page. If a fetch request violates these rules, it results in a CORS error.

How can I fix CORS issues when using fetch?

To fix CORS issues, you can either configure the server to allow requests from your origin by setting appropriate headers, or use a proxy server to route your requests.

What headers do I need to set on the server?

You need to set the 'Access-Control-Allow-Origin' header to specify which origins are allowed to access the resource. You can also include 'Access-Control-Allow-Methods' and 'Access-Control-Allow-Headers' for more control.

Are there any tools to help debug CORS issues?

Yes, you can use browser developer tools to check the network requests and responses. There are also online tools and browser extensions that can help you test CORS configurations.