Retrofit and Ktor

BookNest's catalog now comes from its REST API (GET /books, GET /books/{id}), served locally on port 8616. The emulator reaches the development machine at 10.0.2.2, which Coil's cleartext exception already allows. Android has two mature Kotlin clients, Retrofit 43,944 and Ktor 274,728 , sharing one serialization library.

Subsections

• Defining an API with Retrofit
• OkHttp Interceptors
• Ktor Client
• Retrofit vs Ktor
• kotlinx.serialization
• Result Wrappers
• Fetching the Catalog
• Offline-First