@Override
    public List<ApiGatewayConfig.ApiType> getApiTypes() {
        return null;
    }
Sets default config settings for API Gateway.

<p>By default, this disables OpenAPI and JSON Schema features not
supported by API Gateway.</p>

<p>API Gateway does not allow characters like "_". API Gateway
doesn't support the "default" trait or `int32` or `int64` "format"
values.
smithy-aws-apigateway-openapi/src/main/java/software/amazon/smithy/aws/apigateway/openapi/AddDefaultConfigSettings.java