Interceptor Order in Angular Apps Can Cause Duplicate Error Popups on Token Expiry

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A developer working on an Angular application found that parallel API calls with an expired token triggered multiple error dialogs even though the token was refreshed in the background. The fix involved only reordering two HTTP interceptors in the app configuration rather than changing any service or component code. The article explains that interceptors execute in an onion-like pattern, so the order determines which handler sees a 401 error first. Placing the authentication interceptor closer to the network lets it refresh the token and replay requests before the error handler shows any UI. The error handler is then only reached when refresh genuinely fails, such as for a deactivated account.

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