What should the solutions architect do to resolve the error?
Change the CORS configuration on the S3 bucket. Add rules for CORS to the AllowedOrigin element for www.example.com.
Enable the CORS setting in AWS WAF. Create a web ACL rule in which the Access-Control-Allow-Origin header is set to www.example.com.
Enable the CORS setting on the API Gateway API endpoint. Ensure that the API endpoint is configured to return all responses that have the Access-Control-Allow-Origin header set to www.example.com.
Enable the CORS setting on the Lambda function. Ensure that the return code of the function has the Access-Control-Allow-Origin header set to www.example.com.
Explanations:
Changing the CORS configuration on the S3 bucket is not sufficient since the API Gateway is involved in processing the registration form. The CORS settings need to be addressed at the API Gateway level where the request is being made.
AWS WAF does not handle CORS settings; it primarily filters web traffic. CORS configuration needs to be set on the API Gateway to ensure that the appropriate headers are returned in responses.
Enabling CORS on the API Gateway API endpoint is the appropriate action. This ensures that the Access-Control-Allow-Origin header is correctly set for all responses from the API, allowing the frontend application atwww.example.comto access the API without CORS issues.
While the Lambda function can set the Access-Control-Allow-Origin header in its response, it is more appropriate to manage CORS directly at the API Gateway level. The API Gateway handles the request/response lifecycle and is responsible for the proper CORS configuration for the API responses.
I rank that the answer is:
Enable the CORS setting on the API Gateway API endpoint. Ensure that the API endpoint is configured to return all responses that have the Access-Control-Allow-Origin header set to http://www.example.com.