ios-networking

Build a type-safe API client using URLSession and Swift Concurrency by defining an Endpoint protocol and a generic APIClient for async/await execution with Codable decoding. This provides scalable, compile-time validated network interactions.

Handle OAuth2 token refresh and deduplication in Swift using an Actor-based TokenManager. This mechanism safely manages concurrent token refresh requests, preventing duplicate network calls and race conditions during authentication flows.

Implement exponential backoff retry for URLSession requests within a generic APIClient to automatically recover from 5xx server errors and rate limits. This approach ensures robust network interactions without manual retry loops.

Yes, this networking approach supports REST and GraphQL with Apollo on iOS 13+ environments. The APIClient architecture integrates both protocols alongside strong error handling and observability for scalable data fetching.

Test URLSession networking with URLProtocol to mock network responses and verify offline caching strategies. This testing guidance ensures your APIClient handles intermittent connectivity and offline patterns reliably.