--- title: Our Flutter App Had 12 Different Error-Handling Paths.... description: A Flutter app accumulated 12 inconsistent HTTP error-handling paths across repositories, causing unpredictable user-facing behavior and difficult debugging.... canonical: https://daily.dev/posts/our-flutter-app-had-12-different-error-handling-paths-dio-interceptors-reduced-that-to-1--ohdbr5son twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Our Flutter App Had 12 Different Error-Handling Paths. Dio Interceptors Reduced That to 1. | daily.dev og:description: A Flutter app accumulated 12 inconsistent HTTP error-handling paths across repositories, causing unpredictable user-facing behavior and difficult debugging.... og:url: https://daily.dev/posts/our-flutter-app-had-12-different-error-handling-paths-dio-interceptors-reduced-that-to-1--ohdbr5son og:image: https://api.daily.dev/og/posts/ohdBr5sOn.png og:image:alt: Our Flutter App Had 12 Different Error-Handling Paths. Dio Interceptors Reduced That to 1. og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Our Flutter App Had 12 Different Error-Handling Paths. Dio Interceptors Reduced That to 1. **[Medium](https://daily.dev/sources/medium_js)** · 6 min read · 0 upvotes · 0 comments ## Summary A Flutter app accumulated 12 inconsistent HTTP error-handling paths across repositories, causing unpredictable user-facing behavior and difficult debugging. The solution was centralizing all error logic in a single Dio interceptor that maps every DioException to a sealed AppError type, handles 401 token refresh with retry logic, and delivers a clean Result type to repositories. This eliminated scattered try-catch blocks, made error handling testable in isolation, and reduced the error surface to one consistent path. The refactor took about a day to implement plus a week of incremental cleanup. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [The 401 Race Condition Hiding in Your Flutter App](https://daily.dev/posts/the-401-race-condition-hiding-in-your-flutter-app-uryk54etd) · Medium · 0 upvotes · 0 comments - [How to Integrate APIs Seamlessly in Flutter](https://daily.dev/posts/how-to-integrate-apis-seamlessly-in-flutter-rqxtqkpmi) · Flutter Community · 1 upvotes · 0 comments - [Advanced Error Handling in Dart: Records, Result Types, Monads, and Freezed Exceptions](https://daily.dev/posts/advanced-error-handling-in-dart-records-result-types-monads-and-freezed-exceptions-4hkqgcjub) · freeCodeCamp · 4 upvotes · 0 comments - [How to Handle Errors the Right Way in Flutter: A Practical Guide to Sealed Classes, Records, and Result Types](https://daily.dev/posts/how-to-handle-errors-the-right-way-in-flutter-a-practical-guide-to-sealed-classes-records-and-res-yedt3zvu8) · freeCodeCamp · 5 upvotes · 0 comments --- Tags: [#flutter](https://daily.dev/tags/flutter), [#dart](https://daily.dev/tags/dart) [View this post on daily.dev](https://daily.dev/posts/our-flutter-app-had-12-different-error-handling-paths-dio-interceptors-reduced-that-to-1--ohdbr5son) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Our Flutter App Had 12 Different Error-Handling Paths. 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