API Gateway Method CORS ERROR - CloudFormation

Question

Hello Please when try to use my API Gateway im my react i get this error but in Postman i works fine

**Access to fetch at 'https://api.domainz.com/prod/sp/' from origin 'http://localhost:8100' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.**

Please help How do i enable cors from my cloud formation API Gateway Method

he is my Method Code In cloudformation

```
spPOSTMethod:
    Type: AWS::ApiGateway::Method
    DeletionPolicy: Delete
    Properties:
      AuthorizationType: NONE #Options [CUSTOM, COGNITO_USER_POOLS, COGNITO, NONE, OAUTH2]
      HttpMethod: POST #Options [GET, POST, PUT, DELETE, PATCH, ANY]
      ResourceId: !ImportValue ExSpResources
      RestApiId: !ImportValue ExAppAPI
      Integration:
        Type: AWS_PROXY #Options [AWS_PROXY, AWS, HTTP, MOCK, AWS_PROXY_V2]
        IntegrationHttpMethod: POST #[For Lambda POST][For MOCK this property is optional]
        Uri: !Sub arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${spEventNLFn.Arn}/invocations

RequestModels:
        application/json: !Ref spEventModel
      RequestValidatorId: !Ref spEventPOSTMethodValidator

```

Accepted Answer

Hello.

Do you have "Access-Control-Allow-Origin" in the header when accessing API Gateway with your localhost application?  
Even if CORS is configured on the API Gateway side, an error will occur if the local application does not support it.  
I think the StackOverflow answers below will be helpful.  
https://stackoverflow.com/questions/61238680/access-to-fetch-at-from-origin-http-localhost3000-has-been-blocked-by-cors

API Gateway Method CORS ERROR - CloudFormation

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