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. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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 creating a REST API using Amazon API Gateway with Lambda proxy integration. The API needs to accept and return binary data such as images or PDF files. The developer has configured the API to use the Lambda proxy integration. What additional configuration is required to support binary data?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
In API Gateway, add the binary media types to the API settings, e.g., image/png, application/pdf.
With Lambda proxy integration, API Gateway passes the client request as-is to Lambda and returns the Lambda response as-is to the client. To handle binary data, you must explicitly declare the binary media types (e.g., image/png, application/pdf) in the API Gateway REST API settings. This tells API Gateway to base64-encode the binary payload before sending it to Lambda and to decode the base64-encoded response from Lambda back to binary for the client. Without this configuration, API Gateway treats all payloads as text and will corrupt binary data.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Set the Content-Type header to application/octet-stream in the Lambda response.
Why it's wrong here
Setting the header is necessary, but without API Gateway knowing the media type is binary, the data may be base64-encoded incorrectly.
✓
In API Gateway, add the binary media types to the API settings, e.g., image/png, application/pdf.
Why this is correct
Correct. This tells API Gateway which responses should be treated as binary data.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use an API Gateway custom domain with an SSL certificate.
Why it's wrong here
Custom domains are not related to binary support.
✗
Enable API caching with binary support.
Why it's wrong here
Caching does not enable binary data handling.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume Lambda proxy integration automatically handles binary data because it passes everything through, but in reality, API Gateway requires explicit binary media type configuration to avoid corrupting binary payloads during base64 encoding/decoding.
Detailed technical explanation
How to think about this question
When binary media types are configured, API Gateway automatically base64-encodes the incoming binary request body before passing it to the Lambda function via the event body field. The Lambda function must then set isBase64Encoded: true in the response and include the base64-encoded binary data in the body. API Gateway decodes this back to binary before sending the response to the client. A common subtlety is that the Content-Type header in the response must match one of the configured binary media types; otherwise, API Gateway may treat the response as text even if isBase64Encoded is true.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: In API Gateway, add the binary media types to the API settings, e.g., image/png, application/pdf. — With Lambda proxy integration, API Gateway passes the client request as-is to Lambda and returns the Lambda response as-is to the client. To handle binary data, you must explicitly declare the binary media types (e.g., image/png, application/pdf) in the API Gateway REST API settings. This tells API Gateway to base64-encode the binary payload before sending it to Lambda and to decode the base64-encoded response from Lambda back to binary for the client. Without this configuration, API Gateway treats all payloads as text and will corrupt binary data.
What should I do if I get this DVA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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