How would you answer an interview scenario involving HTTP interceptors in Angular?

For an interview scenario involving HTTP interceptors, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. Angular HTTP interceptors can inspect or transform outgoing requests and incoming responses, enabling cross-cutting behavior around HttpClient. In this scenario, if an access token expires, an auth interceptor can coordinate one token refresh and replay queued safe requests rather than triggering a separate refresh for every failed request. For production, keep interceptors focused on cross-cutting transport concerns, avoid swallowing errors, make retry behavior explicit, and prevent authentication refresh loops. I would then explain the main alternatives and tradeoffs, identify likely failure modes, and describe how I would validate the solution through testing, observability, security controls, and recovery or rollback planning.