An application team wants to minimize unnecessary backend processing by validating client … — AWS Certified Developer - Associate

An application team wants to minimize unnecessary backend processing by validating client requests directly at the API Gateway layer before invoking a downstream AWS Lambda function. The REST API must verify that client requests contain a valid JSON payload matching a specific schema, and automatically reject invalid requests with an HTTP $400$ Bad Request error. Which two configuration steps should the developer perform in Amazon API Gateway to achieve this? (Select TWO.)

Create a Model in the API Gateway console that defines the JSON Schema of the expected request payload.Cevap
In the Method Request settings, select a Request Validator that validates the request body, and associate the request body content type with the created Model.Cevap
C
In the Integration Request settings, configure a mapping template that uses Apache Velocity Template Language (VTL) to validate the payload structure and reject invalid requests.
D
Create a custom Lambda Authorizer that receives the request payload, validates the schema, and returns an IAM policy with a Deny effect if required fields are missing.
E
In the Method Response settings, define a Gateway Response of type Bad Request Body and map it to the execution role of the backend Lambda function.

Cevap

To perform request validation in API Gateway, the developer must create a Model that defines the expected JSON Schema of the payload and configure the Method Request settings by selecting a Request Validator for the request body while mapping the content type to the created Model.

To perform request body validation in API Gateway before invoking a backend Lambda function, the developer must define the structure of the request payload using a Model (defined via JSON Schema) and enable request validation in the Method Request settings by selecting a Request Validator (e.g., 'Validate body') and associating the content type (e.g., 'application/json') with that Model. This ensures that malformed requests are rejected immediately at the API Gateway level, saving backend resources.

Adım Adım Çözüm

Define the schema model

A Model is created in API Gateway containing the JSON Schema defining required fields and types.

API Gateway needs a schema definition to know what fields and structure to enforce on the incoming request.

Configure method request validator

The Request Validator is set to 'Validate body' in the Method Request settings.

This instructs API Gateway to intercept and inspect the incoming payload body against the specified validator rules.

Map content type to the model

The request body content type (e.g., 'application/json') is mapped to the newly created Model.

This tells API Gateway which model to use when validating payloads of that specific content type.

Anahtar Kavram

Request Validation using API Gateway Models and Request Validators

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