import javax.security.auth.callback.Callback
import javax.security.auth.callback.CallbackHandler
import javax.security.auth.callback.PasswordCallback
import javax.security.auth.callback.UnsupportedCallbackException
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.internal.SuppressSignatureCheck
import okhttp3.internal.platform.Platform

/**
 * Example of using a hardware key to perform client auth.