Trouble sending the Jwt in the request header - retrofit2

Question

I'm trying to get a response from a simple protected Endpoint in the back end.
I've tested the Endpoint in Postman. I set up GET request with the KEY: Authorization and a VALUE: bearer eyxhsls...(this is the Jwt)
and the response gives me Status: 200 OK and the requested String. So everything works fine in the back end.
Now I want to replicate this process on the Client-side using Retrofit. Based on some research I using an OkHttpClient.Builder to insert the Jwt(String) into the header.
I try different things like simply inserting the Jwt(String) into header value:
Request.Builder newRequest = request.newBuilder().header("Authorization", bearerToken);
This returns a 401 status
I have also added the "Bearer " to the VALUE, just like I did in Postman, but the caller referred me to the onFailure method with the Message:
use jsonreader.setlenient(true) to accept malformed json at line 1 column 1
So I have added a GsonBuilder with setLeniet to the addConverterFactory. the caller again referred me to the onFailure method, but with the Message:
JSON document was not fully consumed.
Plz, let me know if anyone has a better idea, or understands what is going on. But stuck now for a number of days now.
public CoffeeController() {
okhttpBuilder = new OkHttpClient.Builder()
.addInterceptor(new Interceptor() {
#NonNull
#Override
public okhttp3.Response intercept(#NonNull Chain chain) throws IOException {
Request request = chain.request();
bearerToken = "Bearer " +LoginController.getToken();
bearerToken = LoginController.getToken();
Request.Builder newRequest = request.newBuilder().header("Authorization", bearerToken);
return chain.proceed(newRequest.build());
}
});
gson = new GsonBuilder()
.setLenient()
.create();
retrofit = new Retrofit.Builder()
.baseUrl("http://10.0.2.2:8080/")
.client(okhttpBuilder.build())
//.addConverterFactory(GsonConverterFactory.create())
.addConverterFactory(GsonConverterFactory.create(gson))
.build();
}
public static void CoffeeRead(Context context, TextView ResponseView) {
try {
CoffeeRepo repo = retrofit.create(CoffeeRepo.class);
Call<String> call = repo.Read();
call.enqueue(new Callback<String>() {
#Override
public void onResponse(Call<String> call, Response<String> response) {
message = "Read Coffee: " +"\nToken: " +bearerToken +"\nResponse: " + response.code();
ResponseView.setText(message);
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
#Override
public void onFailure(Call<String> call, Throwable t) {
message = "Failed to read coffee: \n" + t.getMessage();
ResponseView.setText(message);
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
});
} catch (Exception e) {
message = "Caught Exception: \n" + e.getMessage();
ResponseView.setText(message);
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
}
public interface CoffeeRepo {
#Headers({
"Cache-Control: max-age=3600",
"User-Agent: Android"
})
#GET("coffee")
Call<String> Read();
}

Answer 1

After I've added a logger, I found out the response was 200. After some research I found out I needed different ConverterFactory, instead of:
.addConverterFactory(ScalarsConverterFactory.create())
I used
.addConverterFactory(GsonConverterFactory.create(gson));