diff --git a/src/UniTask.NetCore/UniTask.NetCore.csproj b/src/UniTask.NetCore/UniTask.NetCore.csproj
index f7a7a2e..5eb881e 100644
--- a/src/UniTask.NetCore/UniTask.NetCore.csproj
+++ b/src/UniTask.NetCore/UniTask.NetCore.csproj
@@ -36,6 +36,7 @@
 ..\UniTask\Assets\Plugins\UniTask\Runtime\Internal\DiagnosticsExtensions.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\Internal\PlayerLoopRunner.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\Internal\ContinuationQueue.cs;
+..\UniTask\Assets\Plugins\UniTask\Runtime\Internal\UnityWebRequestExtensions.cs;
   
 ..\UniTask\Assets\Plugins\UniTask\Runtime\CancellationTokenSourceExtensions.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\EnumeratorAsyncExtensions.cs;
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/UnityWebRequestExtensions.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/UnityWebRequestExtensions.cs
new file mode 100644
index 0000000..33cc593
--- /dev/null
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/UnityWebRequestExtensions.cs
@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using UnityEngine.Networking;
+
+namespace Cysharp.Threading.Tasks.Internal
+{
+    internal static class UnityWebRequestResultExtensions
+    {
+        public static bool IsError(this UnityWebRequest unityWebRequest)
+        {
+#if UNITY_2020_2_OR_NEWER
+            var result = unityWebRequest.result;
+            return (result == UnityWebRequest.Result.ConnectionError)
+                || (result == UnityWebRequest.Result.DataProcessingError)
+                || (result == UnityWebRequest.Result.ProtocolError);
+#else
+            return unityWebRequest.isHttpError || unityWebRequest.isNetworkError;
+#endif
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/UnityWebRequestExtensions.cs.meta b/src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/UnityWebRequestExtensions.cs.meta
new file mode 100644
index 0000000..54bd2eb
--- /dev/null
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/UnityWebRequestExtensions.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 111ba0e639de1d7428af6c823ead4918
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityAsyncExtensions.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityAsyncExtensions.cs
index 27b6acd..c5cfbc2 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityAsyncExtensions.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityAsyncExtensions.cs
@@ -1221,7 +1221,7 @@ namespace Cysharp.Threading.Tasks
                     continuationAction = null;
                     var result = asyncOperation.webRequest;
                     asyncOperation = null;
-                    if (result.isHttpError || result.isNetworkError)
+                    if (result.IsError())
                     {
                         throw new UnityWebRequestException(result);
                     }
@@ -1231,7 +1231,7 @@ namespace Cysharp.Threading.Tasks
                 {
                     var result = asyncOperation.webRequest;
                     asyncOperation = null;
-                    if (result.isHttpError || result.isNetworkError)
+                    if (result.IsError())
                     {
                         throw new UnityWebRequestException(result);
                     }
@@ -1312,7 +1312,7 @@ namespace Cysharp.Threading.Tasks
                 {
                     completed = true;
                     var result = asyncOperation.webRequest;
-                    if (result.isHttpError || result.isNetworkError)
+                    if (result.IsError())
                     {
                         core.TrySetException(new UnityWebRequestException(result));
                     }
@@ -1470,7 +1470,7 @@ namespace Cysharp.Threading.Tasks
 
                 if (asyncOperation.isDone)
                 {
-                    if (asyncOperation.webRequest.isHttpError || asyncOperation.webRequest.isNetworkError)
+                    if (asyncOperation.webRequest.IsError())
                     {
                         core.TrySetException(new UnityWebRequestException(asyncOperation.webRequest));
                     }
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityAsyncExtensions.tt b/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityAsyncExtensions.tt
index 31e78dd..d5cac19 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityAsyncExtensions.tt
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/UnityAsyncExtensions.tt
@@ -82,7 +82,7 @@ namespace Cysharp.Threading.Tasks
                     var result = <#= $"asyncOperation.{t.returnField}" #>;
                     asyncOperation = null;
 <# if(t.returnType == "UnityWebRequest") { #>
-                    if (result.isHttpError || result.isNetworkError)
+                    if (result.IsError())
                     {
                         throw new UnityWebRequestException(result);
                     }
@@ -98,7 +98,7 @@ namespace Cysharp.Threading.Tasks
                     var result = <#= $"asyncOperation.{t.returnField}" #>;
                     asyncOperation = null;
 <# if(t.returnType == "UnityWebRequest") { #>
-                    if (result.isHttpError || result.isNetworkError)
+                    if (result.IsError())
                     {
                         throw new UnityWebRequestException(result);
                     }
@@ -184,7 +184,7 @@ namespace Cysharp.Threading.Tasks
                     completed = true;
 <# if(t.returnType == "UnityWebRequest") { #>
                     var result = asyncOperation.webRequest;
-                    if (result.isHttpError || result.isNetworkError)
+                    if (result.IsError())
                     {
                         core.TrySetException(new UnityWebRequestException(result));
                     }
@@ -362,7 +362,7 @@ namespace Cysharp.Threading.Tasks
                 if (asyncOperation.isDone)
                 {
 <# if(t.returnType == "UnityWebRequest") { #>
-                    if (asyncOperation.webRequest.isHttpError || asyncOperation.webRequest.isNetworkError)
+                    if (asyncOperation.webRequest.IsError())
                     {
                         core.TrySetException(new UnityWebRequestException(asyncOperation.webRequest));
                     }