Amazon API Gateway Now Supports Automatic Request Validation

You can now configure Amazon API Gateway to automatically perform basic request validation for your APIs. This reduces the burden of needing to check for required parameters in requests made to your API and instead allows you to focus on application-specific validation efforts. Previously, you needed to manually implement basic validation of input data in your API backends, making it more likely to introduce conflicts between your validation logic and API models. 
Quelle: aws.amazon.com