Should this call be retried
The gateway client decides whether a failed call is worth trying again, or whether retrying would only make things worse.
- Retry a 429 and anything in the 500s — those are the bank being busy or broken.
- Never retry anything else; a 400 will fail the same way forever.
- Three attempts is the ceiling, so an attempt number of 3 or more stops.
- The attempt number counts from 1; anything lower is nonsense and stops too.
ShouldRetry(status: int, attempt: int) → bool
C# needs a compiler and Drill does not host one yet, so this page is the reference rather than an exercise: the problem, worked examples, and the solution in full. To type it out, the same problem runs in Python.
Where you start
public bool ShouldRetry(int status, int attempt) {
}Worked examples
| Call | Result |
|---|---|
ShouldRetry(500, 1) | true |
ShouldRetry(429, 2) | true |
ShouldRetry(503, 3) | false |
ShouldRetry(404, 1) | false |
Hint
Deal with the attempt ceiling first, then the status.
Reference solution in C#
public bool ShouldRetry(int status, int attempt) {
if (attempt < 1 || attempt >= 3) return false;
return status == 429 || (status >= 500 && status <= 599);
}