[Solved]-React.js - CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. [AWS - Lambda - API GATEWAY]-Reactjs

After reading about CORS and consulting with a professional, response headers must be updated to the following in order to fix the problem :

headers : {
        "Access-Control-Allow-Headers": "*",
        "Access-Control-Allow-Origin": "*",
        "Access-Control-Allow-Methods": "*"      
    }

Of course, CORS must be enabled on API Gateway for each method used.