How to Handle CORS Errors with Missing \'Access-Control-Allow-Origin\' Header for 5xx and 4xx Responses?

"Error handling for 5xx and 4xx errors with 'No 'Access-Control-Allow-Origin' header is present'"

When using the Fetch API to make requests from one origin to another, it's crucial to understand the potential for CORS errors. These errors can arise when the server hosting the requested resource lacks the appropriate CORS headers, such as 'Access-Control-Allow-Origin'.

HTTP Error Codes and CORS Headers

An HTTP 5xx error indicates a server-side problem, suggesting a failure on the server. On the other hand, a 4xx error signifies an issue with the request itself, preventing the server from processing it.

Troubleshooting CORS Errors

If encountering such errors, investigating server logs is essential to pinpoint the underlying cause. Unlike a successful 2xx response, servers typically don't send the Access-Control-Allow-Origin header with 5xx and 4xx responses.

Resolving 5xx and 4xx Errors

Addressing the root cause of the 5xx or 4xx error is paramount. Once the issue is resolved and a successful response is achieved, the CORS configuration should align with expectations.

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