DVA-C02 Exam Dumps : AWS Certified Developer - Associate

DynamoDB TTL (Time-to-Live): A native feature that automatically deletes items after a specified expiration time.

Efficiency: Eliminates the need for scheduled deletion jobs, optimizing write throughput by avoiding potential throttling conflicts.

Seamless Integration: TTL works directly within DynamoDB, requiring minimal development overhead.

Mocking API Responses: API Gateway's Mock integration type enables simulating API behavior without invoking backend services.

Testing with Sample Data: Using captured responses from the real third-party API ensures realistic testing of the integration code.

Focus on Integration Logic: This solution allows the developer to isolate and test the application's interaction with the payment APIs, even without a test environment from the third-party providers.

Comprehensive Detailed and Lengthy Step-by-Step Explanation with All AWS Developer References:

1. Understanding the Use Case:

The API needs to:

Generate responses without backend integrations: This indicates the use of mock responses for testing.

Be used by multiple internal teams during development.

Minimize operational overhead.

2. Key Features of Amazon API Gateway:

REST APIs: Fully managed API Gateway option that supports advanced capabilities like mock integrations, request/response transformation, and more.

HTTP APIs: Lightweight option for building APIs quickly. It supports fewer features but has lower operational complexity and cost.

Mock Integration: Allows API Gateway to return pre-defined responses without requiring backend integration.

3. Explanation of the Options:

Option A:"Create an Amazon API Gateway REST API. Set up a proxy resource that has the HTTP proxy integration type."A proxy integration requires a backend service for handling requests. This does not meet the requirement of "no backend integrations."

Option B:"Create an Amazon API Gateway HTTP API. Provision a VPC link, and set up a private integration on the API to connect to a VPC."This requires setting up a VPC and provisioning resources, which increases operational overhead and is unnecessary for this use case.

Option C:"Create an Amazon API Gateway HTTP API. Enable mock integration on the method of the API resource."While HTTP APIs can enable mock integrations, they have limited support for advanced features compared to REST APIs, such as detailed request/response customization. REST APIs are better suited for development environments requiring mock responses.

Option D:"Create an Amazon API Gateway REST API. Enable mock integration on the method of the API resource."This is the correct answer. REST APIs with mock integration allow defining pre-configured responses directly within API Gateway, making them ideal for scenarios where backend services are unavailable. It provides flexibility for testing while minimizing operational overhead.

4. Implementation Steps:

To enable mock integration with REST API:

Create a REST API in API Gateway:

Open the API Gateway Console.

Choose Create API > REST API.

Define the API Resource and Methods:

Add a resource and method (e.g., GET or POST).

Set Up Mock Integration:

Select the method, and in the Integration Type, choose Mock Integration.

Configure the Mock Response:

Define a 200 OK response with the desired response body and headers.

Deploy the API:

Deploy the API to a stage (e.g., dev) to make it accessible.

5. Why REST API Over HTTP API?

REST APIs support detailed request/response transformations and robust mock integration features, which are ideal for development and testing scenarios.

While HTTP APIs offer lower cost and simplicity, they lack some advanced features required for fine-tuned mock integrations.