PL-900 Practice Question: Demonstrate the capabilities of Power Automate
You are troubleshooting a Power Automate flow that uses an HTTP action to call a REST API. The flow fails with a '429 Too Many Requests' error. The API has a rate limit of 100 requests per minute. Which strategy should you implement to handle this error gracefully?
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
✓
Implement retry logic with exponential backoff in the HTTP action settings.
Implementing retry logic with exponential backoff allows the flow to automatically retry the request after a delay that increases with each attempt, which is the standard approach to handle rate limiting (HTTP 429 errors) and reduces server load. Option B is wrong because increasing concurrency would send more requests simultaneously, likely exacerbating the rate limit issue. Option C is wrong because simply ignoring 429 errors means requests are not retried and the action fails. Option D is wrong because 'Configure Run After' can handle failures but does not implement backoff, so it would not effectively manage rate limits.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Implement retry logic with exponential backoff in the HTTP action settings.
Why this is correct
Exponential backoff reduces request rate after 429 responses.
- ✗
Increase the flow's concurrency setting to process more requests simultaneously.
Why it's wrong here
More concurrency would increase rate limit hits.
- ✗
Use a 'Condition' action to check the status code and ignore 429 errors.
Why it's wrong here
Ignoring errors would miss API calls.
- ✗
Use the 'Configure Run After' option to skip the action on failure.
Why it's wrong here
Skipping on failure does not retry.
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