https://habrahabr.ru/post/314028/
http://java-help.ru/retrofit-2-review/
Configuring Retrofit 2 Client in Android [https://proandroiddev.com/configuring-retrofit-2-client-in-android-130455eaccbd]
Building your own Retrofit Call Adapter [https://android.jlelse.eu/building-your-own-retrofit-call-adapter-b198169bab69]
An HTTP inspector for Android & OkHTTP (like Charles but on device) – More Chucker than Chuck [https://github.com/ChuckerTeam/chucker]
Mock retrofit in kotlin coroutines [https://blog.kotlin-academy.com/a-little-reflection-about-coroutines-34050cbc4fe6]