Change retrofit okhttp client at runtime

You can add Credentials manual as Header To your request.

Example:

@GET("user")
Call<UserDetails> getUserDetails(@Header("Authorization") String credentials)

Credentials.basic("ausername","apassword");

You can use the Retrofit method newBuilder to get a new builder and there set a different OkHttpClient with different attributes. Put something like this into your else case:

retrofit.newBuilder()
        .client(anotherOkHttpClientWithOtherAttributes.build())
        .build()