HTTP Get Request works in Unity Editor but not on Hololens

Hi,
i use a get request to get data from a webservice. In the unity editor every thing works fine, but on hololens the request reaches the webservice but the data wont get to the hololens. Also the delay i implemented in the update method isnt working either. Bevor the approach with the get request i programmed an opc ua client in unity. There it was the same problem. In the editor every thing is working fine, but not on the hololens.
I'm using:
- unity 2018.4.6f1
- visual studio 2017 community
- skripting backend il2cpp, api level .NET4.x and .net 4.0
- and as base programm i'm using the gaze tutorial programm from the hololens microsoft tutorial
- player settings internetclient, internetclientserver, privatenetworkclientserver are activated

Following my code:

public float countdown = 3.0f;

void Update()

    {

        countdown -= Time.deltaTime;

        if (countdown <= 0.0f)

        {

            GetInfo();

            currentWayPointText.text = info.CurrentWaypoint.ToString();

            xText.text = info.X.ToString();

            yText.text = info.Y.ToString();

            alphaText.text = info.Alpha.ToString();

            countdown = 5.0f;

        }

    }



public AgvDriveStatus GetInfo()

    {

        request = (HttpWebRequest)WebRequest.Create("http://141.60.104.41:50304/api/AgvInformation");

        response = (HttpWebResponse)request.GetResponse();

        reader = new StreamReader(response.GetResponseStream());

        jsonResponse = reader.ReadToEnd();

        info = JsonConvert.DeserializeObject<AgvDriveStatus>(jsonResponse);

        return info;

    }

If anyone has an idea what i'm doing wrong or has a sample code of an working rest client or opc ua client i would be really thankfull

Kind Regards,
Stefan