Change REST API Gateway lambda authorizer response

Question

Currently, I return this 
```
{
          "principalId": "user",
          "policyDocument": {
            "Version": "2012-10-17",
            "Statement": [
              {
                "Action": "execute-api:Invoke",
                "Effect": "Allow" if isAuthorized else "Deny",
                "Resource": self.resource
              }
            ]
          }
        }
```
I get a message like this now in the authorizer response body if unauthorized,

```
{
    "message": "Unauthorized"
}
```

How can I manipulate this so that the message when unauthorized is changed?

Answer

Have a look at this: https://repost.aws/knowledge-center/api-gateway-401-error-lambda-authorizer, as it could be issues with [configuration](https://docs.aws.amazon.com/apigateway/latest/developerguide/configure-api-gateway-lambda-authorization-with-console.html) or usage/lack of [tokens](https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-use-lambda-authorizer.html#api-gateway-lambda-authorizer-token-lambda-function-create).

Also double check whether you [resource policy ](https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-resource-policies.html) may have a role into this.

Change REST API Gateway lambda authorizer response

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