Show text from txt file from http

Hello guys, i have a Problem that my code works in the unity build. But when I test it on smartphone it won't show the text. When I change the url to a https url txt file it works. I think the smartphone won't show txt from http. How can I show even http txt on smartphone? Here is my code:

 public Text textFromWWW;
 
 
 
     void Start()
     {
         StartCoroutine(GetTextFromWWW());
     }
 
     IEnumerator GetTextFromWWW()
     {
         UnityWebRequest www = UnityWebRequest.Get("http://....txt");
         yield return www.SendWebRequest();
 
         if (www.isNetworkError || www.isHttpError)
         {
             Debug.Log(www.error);
         }
         else
         {
             // Show results as text
             textFromWWW.text = www.downloadHandler.text;
         }
 
     }