Handling timeouts in insurance quote APIs

A request can time out even when a remote system has received it and is still processing it. The caller may not know whether the operation failed, succeeded or is still in progress. Treating every timeout as a definite failure can create duplicate work; treating it as success can hide an incomplete response.

Represent the unknown state

Define an explicit state for a request whose outcome has not yet been confirmed. Keep the original request identifier, the time it was sent and any safe correlation reference so that a later response can be matched to the correct operation. Present the state clearly to the user or downstream service rather than showing a misleading final answer.

Retry only with a known strategy

Use the API contract to determine which operations can be retried safely. Where the provider supports idempotency keys, reuse the same key for retries of the same operation and follow its documented scope and retention rules. Do not assume that adding a new request identifier will prevent duplicates. For operations without a safe retry mechanism, check status through the documented route or send the case to a controlled exception queue.

Set a bounded retry policy with backoff and a clear stop point. A retry should not create an unbounded loop or overwhelm a remote service. Separate temporary connectivity failures from validation responses and other definitive errors.

Make responses traceable

• Keep correlation identifiers across the application and integration boundary.
• Record request, response and retry times without logging unnecessary customer data.
• Reconcile delayed responses to their original requests.
• Raise an exception when the result remains unresolved after the agreed retry window.
• Use provider-specific error mappings from the current integration contract.

Test delayed and duplicate outcomes

Test a response arriving after the client timeout, a repeated request with the same idempotency key, a definitive rejection, a network interruption and a response that cannot be matched. Confirm that the system does not create a second quote request just because the first result was slow, and that the operator can see what remains unresolved.

Timeout and retry behaviour varies by API and operation. Confirm the rules against the relevant provider documentation and avoid presenting an unknown response as a quote, decline or accepted transaction.

Explore related planning material in VYPR Insights.