AWS API Gateway CORS Issue Fix

I am encountering a CORS error when trying to access my AWS API Gateway from a web application. The error message states that the request has been blocked by CORS policy, indicating that the 'Access-Control-Allow-Origin' header is missing.

I would like to troubleshoot this issue with an expert who can hop on a call with me, I share my screen and the expert will guide me on how to resolve the problem.

Ideal Skills:
- AWS API Gateway expertise
- CORS configuration experience
- Web application development background