diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityWebRequestException.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityWebRequestException.cs
index df61999..6dd1168 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityWebRequestException.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityWebRequestException.cs
@@ -32,6 +32,10 @@ namespace Cysharp.Threading.Tasks
             this.Error = unityWebRequest.error;
             this.ResponseCode = unityWebRequest.responseCode;
             this.Text = unityWebRequest.downloadHandler.text;
+            if (UnityWebRequest.downloadHandler != null)
+            {
+                this.Text = unityWebRequest.downloadHandler.text;
+            }
         }
 
         public override string Message
@@ -40,7 +44,14 @@ namespace Cysharp.Threading.Tasks
             {
                 if (msg == null)
                 {
-                    msg = Error + Environment.NewLine + Text;
+                    if (Text != null)
+                    {
+                        msg = Error + Environment.NewLine + Text;
+                    }
+                    else
+                    {
+                        msg = Error;
+                    }
                 }
                 return msg;
             }
diff --git a/src/UniTask/Assets/Scenes/SandboxMain.cs b/src/UniTask/Assets/Scenes/SandboxMain.cs
index 83a80b4..f84ced7 100644
--- a/src/UniTask/Assets/Scenes/SandboxMain.cs
+++ b/src/UniTask/Assets/Scenes/SandboxMain.cs
@@ -476,25 +476,9 @@ public class SandboxMain : MonoBehaviour
 
     async UniTaskVoid Start()
     {
-        var cts = new CancellationTokenSource();
-        okButton.onClick.AddListener(() =>
-        {
-            cts.Cancel();
-        });
-
-        //// Nanika();
-
-
-        //await UniTask.Yield();
-
-
-        await MyEveryUpdate().Select(x => x).Where(x => x % 2 == 0).ForEachAsync(x =>
-                {
-                    UnityEngine.Debug.Log(x + ":" + Time.frameCount);
-                }, cts.Token);
-
-
-        // this.GetCancellationTokenOnDestroy()
+        var url =  "http://fooooooooooooooooooooooooooooooooooo.com";
+        var webRequestAsyncOperation = UnityWebRequest.Head(url).SendWebRequest();
+        await webRequestAsyncOperation.ToUniTask();
 
         //PlayerLoopInfo.Inject();