WebGL play video using VideoPlayer and StreamingAssets

Hello everybody, I want to play video using VideoPlayer URL from StreamingAssets in my WebGL game. In editor everything works fine but when I build and upload game on my server video doesn't play. Do you have any ideas how to play video from StreamingAssets folder?

Here is script with which video play in editor:

 private void StartVideo()
     {
         videoPlayer.url ="file://"+ Application.streamingAssetsPath + "/PlayerBadScore/1.mp4";
         videoPlayer.Play();
     }

Here is script with which video doesn't play in editor either server:

 IEnumerator StartVideo()
     {
         string filePath = Application.streamingAssetsPath+ "/PlayerBadScore/1.mp4";
         string result = "";
         if (filePath.Contains("://")|| filePath.Contains(":///"))
         {
             WWW www = new WWW(filePath);
             yield return www;
             result = www.text;
         }
         else
         {
             result = System.IO.File.ReadAllText(filePath);
         }
         videoPlayer.url = result;
         videoPlayer.Play();
     }

And in this script I get error that .Get doesn't exists in UnityWebRequest:

 var filePath = System.IO.Path.Combine(Application.streamingAssetsPath, "/PlayerBadScore/1.mp4");
     var result = "";
     if (filePath.Contains("://"))
     {
         var www = new UnityEngine.Networking.UnityWebRequest.Get(filePath);
         yield return www.SendWebRequest();
         result = www.downloadHandler.text;
     }
     else
         result = System.IO.File.ReadAllText(filePath);
 
 videoPlayer.url=result;
 videoPlayer.Play();