- A
Access-Control-Allow-Origin: https://example.com, Access-Control-Allow-Methods: GET,POST
This configuration returns the specific origin and allowed methods, which is sufficient for the preflight request.
- B
Access-Control-Allow-Origin: *, Access-Control-Allow-Methods: GET,POST,OPTIONS
Why wrong: Using '*' for origin is not specific to the required origin. Including OPTIONS in the methods list is unnecessary and may expose more than intended.
- C
Access-Control-Allow-Origin: https://example.com, Access-Control-Allow-Methods: GET,POST,OPTIONS
Why wrong: Including OPTIONS in the allowed methods is not needed; the browser uses OPTIONS only for the preflight, not the actual request.
- D
Access-Control-Allow-Origin: https://example.com, Access-Control-Allow-Headers: Content-Type
Why wrong: This response lacks the required Access-Control-Allow-Methods header, so the browser would not allow the actual GET/POST requests.
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 building a RESTful API using Amazon API Gateway and Lambda. The API should support CORS for a specific origin (https://example.com) and allow only GET and POST methods. Which configuration in the OPTIONS method response will satisfy these requirements?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Access-Control-Allow-Origin: https://example.com, Access-Control-Allow-Methods: GET,POST
Option A is correct because the OPTIONS method response must include the `Access-Control-Allow-Origin` header set to the specific origin `https://example.com` to restrict CORS access, and the `Access-Control-Allow-Methods` header must list only the allowed HTTP methods (`GET,POST`). The OPTIONS method itself is a preflight request and does not need to be listed in the allowed methods; it is automatically handled by the browser. This configuration satisfies the requirement of supporting CORS for a single origin and only GET and POST methods.
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.
- ✓
Access-Control-Allow-Origin: https://example.com, Access-Control-Allow-Methods: GET,POST
Why this is correct
This configuration returns the specific origin and allowed methods, which is sufficient for the preflight request.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Access-Control-Allow-Origin: *, Access-Control-Allow-Methods: GET,POST,OPTIONS
Why it's wrong here
Using '*' for origin is not specific to the required origin. Including OPTIONS in the methods list is unnecessary and may expose more than intended.
- ✗
Access-Control-Allow-Origin: https://example.com, Access-Control-Allow-Methods: GET,POST,OPTIONS
Why it's wrong here
Including OPTIONS in the allowed methods is not needed; the browser uses OPTIONS only for the preflight, not the actual request.
- ✗
Access-Control-Allow-Origin: https://example.com, Access-Control-Allow-Headers: Content-Type
Why it's wrong here
This response lacks the required Access-Control-Allow-Methods header, so the browser would not allow the actual GET/POST requests.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often mistakenly include `OPTIONS` in the `Access-Control-Allow-Methods` header, thinking it must be listed because the preflight request uses that method, but the correct behavior is to only list the actual HTTP methods (GET, POST) that the API supports for the main request.
Detailed technical explanation
How to think about this question
Under the hood, the CORS preflight request (OPTIONS) is sent by the browser to check if the actual request is safe to send; the server must respond with the appropriate CORS headers. The `Access-Control-Allow-Methods` header tells the browser which HTTP methods are allowed for the actual request, and the `Access-Control-Allow-Origin` header specifies which origins are permitted to access the resource. A common subtlety is that the OPTIONS method itself is never listed in `Access-Control-Allow-Methods` because the preflight response is separate from the actual method permissions, and including it can cause some browsers to reject the preflight response.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
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: Access-Control-Allow-Origin: https://example.com, Access-Control-Allow-Methods: GET,POST — Option A is correct because the OPTIONS method response must include the `Access-Control-Allow-Origin` header set to the specific origin `https://example.com` to restrict CORS access, and the `Access-Control-Allow-Methods` header must list only the allowed HTTP methods (`GET,POST`). The OPTIONS method itself is a preflight request and does not need to be listed in the allowed methods; it is automatically handled by the browser. This configuration satisfies the requirement of supporting CORS for a single origin and only GET and POST methods.
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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Last reviewed: Jun 11, 2026
This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.
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