Question

You build a Power Automate cloud flow that calls a partner's REST API through an HTTP action. The API occasionally returns HTTP 429 (Too Many Requests) with a Retry-After header, and the vendor asks that you honor that header rather than retrying immediately. The flow must attempt the call up to five times, waiting the number of seconds specified in Retry-After between attempts, and only fail the run if all five attempts return a throttling response. Which approach best meets these requirements?

Accepted Answer

Wrap the HTTP action in a Do Until loop that repeats until the status code is not 429 or the loop count reaches 5, using a Delay action that reads the Retry-After value from the response headers.

Answer

Configure the HTTP action's built-in Retry Policy to 'Exponential Interval' with a count of 5 and let the platform manage backoff automatically.

Answer

Set 'Configure run after' on the next action to trigger on 'has failed' and add a single Delay of 60 seconds before retrying the HTTP action once.

Answer

Enable concurrency control on the trigger and set the degree of parallelism to 1 so that requests are naturally spaced out and never throttled.