Android Retrofit

This handles the standard Retrofit setup you'll need for any modern Android app doing HTTP calls. It covers the practical stuff: dynamic URLs with path and query parameters, sending JSON bodies versus form data, header management both static and through interceptors, and proper Kotlin coroutines integration. The Hilt module example shows how to wire up OkHttp with logging and timeouts alongside kotlinx.serialization. The guidance on when to use Response<T> versus direct body types is actually useful, since that trips people up when they need to handle specific status codes. It assumes you're already sold on Retrofit and just want the current best practices without digging through Stack Overflow.