DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: lambda proxy integration passes the full request to the Lambda function.. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer is building a serverless application using AWS Lambda and Amazon API Gateway. The API must support different HTTP methods (GET, POST, PUT, DELETE) for the same resource path. The developer wants to define the API in a single Lambda function that can handle all methods without additional mapping configuration. Which Lambda integration type should the developer use?
Correct. With Lambda proxy integration, API Gateway sends the entire request to the Lambda function, and the function can inspect the HTTP method to handle different operations.
B
Lambda custom integration
Why wrong: Custom integration requires mapping templates to transform the request/response, which adds complexity. Proxy integration is simpler for multi-method APIs.
C
AWS service integration
Why wrong: AWS service integration is used for directly calling other AWS services from API Gateway, not for routing to a Lambda function based on the request.
D
HTTP integration
Why wrong: HTTP integration is for proxying to an HTTP backend, not for invoking a Lambda function directly.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Lambda proxy integration
Lambda proxy integration (option A) is correct because it allows a single Lambda function to handle all HTTP methods (GET, POST, PUT, DELETE) for the same resource path without additional mapping configuration. In this integration type, API Gateway passes the entire client request (method, headers, query parameters, body) as a JSON event to the Lambda function, and the function must return a response in a specific format that includes status code, headers, and body. This eliminates the need for manual mapping templates or method-specific configurations.
Key principle: Lambda proxy integration passes the full request to the Lambda function.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Lambda proxy integration
Why this is correct
Correct. With Lambda proxy integration, API Gateway sends the entire request to the Lambda function, and the function can inspect the HTTP method to handle different operations.
Related concept
Lambda proxy integration passes the full request to the Lambda function.
✗
Lambda custom integration
Why it's wrong here
Custom integration requires mapping templates to transform the request/response, which adds complexity. Proxy integration is simpler for multi-method APIs.
✗
AWS service integration
Why it's wrong here
AWS service integration is used for directly calling other AWS services from API Gateway, not for routing to a Lambda function based on the request.
✗
HTTP integration
Why it's wrong here
HTTP integration is for proxying to an HTTP backend, not for invoking a Lambda function directly.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Lambda custom integration with Lambda proxy integration, thinking that custom integration provides more control, but they overlook that proxy integration is specifically designed to handle multiple HTTP methods without additional mapping configuration.
Detailed technical explanation
How to think about this question
Under the hood, Lambda proxy integration sends the entire HTTP request as a JSON object with fields like `httpMethod`, `headers`, `queryStringParameters`, `pathParameters`, and `body` to the Lambda function, which must parse the `httpMethod` field to determine the action. A subtle behavior is that the Lambda function must return a response with `statusCode`, `headers`, and `body` fields; if the body is not a string, API Gateway will return a 502 error. In real-world scenarios, this integration simplifies development by allowing a single function to act as a router, but it also means the function must handle all error handling and response formatting itself.
KKey Concepts to Remember
Lambda proxy integration passes the full request to the Lambda function.
The Lambda function receives the HTTP method in the event object.
It simplifies handling multiple HTTP methods for a single resource path.
No API Gateway mapping templates are required for request/response transformation.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Lambda proxy integration passes the full request to the Lambda function.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Lambda proxy integration passes the full request to the Lambda function. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review lambda proxy integration passes the full request to the Lambda function., then practise related DVA-C02 questions on the same topic to reinforce the concept.
Development with AWS Services — This question tests Development with AWS Services — Lambda proxy integration passes the full request to the Lambda function..
What is the correct answer to this question?
The correct answer is: Lambda proxy integration — Lambda proxy integration (option A) is correct because it allows a single Lambda function to handle all HTTP methods (GET, POST, PUT, DELETE) for the same resource path without additional mapping configuration. In this integration type, API Gateway passes the entire client request (method, headers, query parameters, body) as a JSON event to the Lambda function, and the function must return a response in a specific format that includes status code, headers, and body. This eliminates the need for manual mapping templates or method-specific configurations.
What should I do if I get this DVA-C02 question wrong?
Review lambda proxy integration passes the full request to the Lambda function., then practise related DVA-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Lambda proxy integration passes the full request to the Lambda function.
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