- A
Change the deployment configuration to use AllAtOnce to avoid health checks.
Why wrong: AllAtOnce still performs health checks.
- B
Increase the health check grace period in the Auto Scaling group.
Why wrong: Grace period only delays the check; if the endpoint returns 500, it will still fail.
- C
Disable the health check in the CodeDeploy deployment configuration.
Why wrong: Disabling health checks could allow deployment of a broken application.
- D
Modify the application to handle the health check endpoint correctly and return HTTP 200.
The health check endpoint must return a successful status (e.g., 200) for CodeDeploy to consider the instance healthy.
Question 476 of 1,750
CodeDeploy Health Check HTTP 500 Error: Fix the Application
This DOP-C02 practice question tests your understanding of sdlc automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 DevOps team uses AWS CodeDeploy to deploy an application to an Auto Scaling group. The deployment fails with a 'HealthCheckFailed' error. The application is running, but the health check endpoint returns HTTP 500. What should the team do to resolve this issue?
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
✓
Modify the application to handle the health check endpoint correctly and return HTTP 200.
Option D is correct because the health check endpoint returns HTTP 500, indicating the application is not functioning correctly despite running. CodeDeploy uses the health check endpoint to verify the application is healthy after deployment; returning HTTP 200 is required for the deployment to succeed. The team must fix the application code to properly handle the health check endpoint and return a successful status.
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.
- ✗
Change the deployment configuration to use AllAtOnce to avoid health checks.
Why it's wrong here
AllAtOnce still performs health checks.
- ✗
Increase the health check grace period in the Auto Scaling group.
Why it's wrong here
Grace period only delays the check; if the endpoint returns 500, it will still fail.
- ✗
Disable the health check in the CodeDeploy deployment configuration.
Why it's wrong here
Disabling health checks could allow deployment of a broken application.
- ✓
Modify the application to handle the health check endpoint correctly and return HTTP 200.
Why this is correct
The health check endpoint must return a successful status (e.g., 200) for CodeDeploy to consider the instance healthy.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse CodeDeploy's deployment health check with Auto Scaling's health check grace period, thinking that increasing the grace period will allow the application more time to become healthy, but CodeDeploy's health check is immediate and not governed by that setting.
Detailed technical explanation
How to think about this question
CodeDeploy performs health checks against the target group or load balancer associated with the Auto Scaling group, using the configured health check path and protocol (e.g., HTTP GET on /health). The health check grace period in Auto Scaling (default 300 seconds) only prevents Auto Scaling from terminating instances during initial launch, but CodeDeploy's deployment health check is independent and occurs after the application is deployed. In real-world scenarios, a common cause is a missing dependency or misconfigured application server that fails to serve the health check endpoint, requiring code fixes rather than configuration changes.
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.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Modify the application to handle the health check endpoint correctly and return HTTP 200. — Option D is correct because the health check endpoint returns HTTP 500, indicating the application is not functioning correctly despite running. CodeDeploy uses the health check endpoint to verify the application is healthy after deployment; returning HTTP 200 is required for the deployment to succeed. The team must fix the application code to properly handle the health check endpoint and return a successful status.
What should I do if I get this DOP-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: Jul 4, 2026
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