How a slow third-party API can crash your entire app and how to prevent it

When a shipping API slowed from 200ms to 40 seconds, dependent applications saw their queues flood and connections exhaust, taking down entire services beyond just checkout. The root cause was blind trust in external APIs with no timeout, retry, or error-handling logic in place. Laravel's HTTP Client offers built-in methods — timeout(), retry(), and throw() — that can be chained to limit wait times, handle transient failures, and surface errors explicitly. Developers are also advised to separate connection timeouts from response timeouts for finer control over API calls. A key caution applies to non-idempotent operations like payments, where retries should only trigger if the request never reached the server, to avoid duplicate charges.