diff --git a/api/MagicOnion.Client.IStreamingHubDiagnosticHandler.html b/api/MagicOnion.Client.IStreamingHubDiagnosticHandler.html
index 79d6b9abd..1b0178dae 100644
--- a/api/MagicOnion.Client.IStreamingHubDiagnosticHandler.html
+++ b/api/MagicOnion.Client.IStreamingHubDiagnosticHandler.html
@@ -120,7 +120,7 @@ <h4>Methods
       </tr>
       <tr>
         <td>
-          <a class="xref" href="MagicOnion.Client.IStreamingHubDiagnosticHandler.html#MagicOnion_Client_IStreamingHubDiagnosticHandler_OnRequestEnd__2___0_Guid_System_String___1_">OnRequestEnd&lt;THub, TResponse&gt;(THub, Guid, String, TResponse)</a>
+          <a class="xref" href="MagicOnion.Client.IStreamingHubDiagnosticHandler.html#MagicOnion_Client_IStreamingHubDiagnosticHandler_OnRequestEnd__2___0_Guid_System_String___1_System_Nullable_Exception__">OnRequestEnd&lt;THub, TResponse&gt;(THub, Guid, String, TResponse, Nullable&lt;Exception&gt;)</a>
         </td>
         <td class="markdown level1 summary"><p>[Preview] The callback method at the end of a Hub method request. This API may change in the future.</p>
 </td>
@@ -224,13 +224,13 @@ <h5 class="typeParameters">Type Parameters</h5>
   </section>
   <section>
   <a id="MagicOnion_Client_IStreamingHubDiagnosticHandler_OnRequestEnd_" data-uid="MagicOnion.Client.IStreamingHubDiagnosticHandler.OnRequestEnd*"></a>
-  <h4 id="MagicOnion_Client_IStreamingHubDiagnosticHandler_OnRequestEnd__2___0_Guid_System_String___1_" data-uid="MagicOnion.Client.IStreamingHubDiagnosticHandler.OnRequestEnd``2(``0,Guid,System.String,``1)">OnRequestEnd&lt;THub, TResponse&gt;(THub, Guid, String, TResponse)</h4>
+  <h4 id="MagicOnion_Client_IStreamingHubDiagnosticHandler_OnRequestEnd__2___0_Guid_System_String___1_System_Nullable_Exception__" data-uid="MagicOnion.Client.IStreamingHubDiagnosticHandler.OnRequestEnd``2(``0,Guid,System.String,``1,System.Nullable{Exception})">OnRequestEnd&lt;THub, TResponse&gt;(THub, Guid, String, TResponse, Nullable&lt;Exception&gt;)</h4>
   <div class="markdown level1 summary"><p>[Preview] The callback method at the end of a Hub method request. This API may change in the future.</p>
 </div>
   <div class="markdown level1 conceptual"></div>
   
   <div class="codewrapper">
-    <pre><code class="lang-csharp hljs">void OnRequestEnd&lt;THub, TResponse&gt;(THub hubInstance, Guid requestId, string methodName, TResponse response)</code></pre>
+    <pre><code class="lang-csharp hljs">void OnRequestEnd&lt;THub, TResponse&gt;(THub hubInstance, Guid requestId, string methodName, TResponse response, Exception? exception)</code></pre>
   </div>
 
   <section>
@@ -244,6 +244,8 @@ <h5 class="parameters">Parameters</h5>
     <dd></dd>
     <dt><span class="parametername"><code>response</code></span> <span class="xref">TResponse</span></dt>
     <dd></dd>
+    <dt><span class="parametername"><code>exception</code></span> <span class="xref">System.Nullable</span>&lt;<span class="xref">Exception</span>&gt;</dt>
+    <dd></dd>
   </dl>
   </section>
   
diff --git a/manifest.json b/manifest.json
index 4e7831b78..934217715 100644
--- a/manifest.json
+++ b/manifest.json
@@ -153,7 +153,7 @@
       "output": {
         ".html": {
           "relative_path": "api/MagicOnion.Client.IStreamingHubDiagnosticHandler.html",
-          "hash": "Bh7mZborfd8kubz1ZG96dDQlfsxwnMy1Nizeecjlmpw="
+          "hash": "qFS8oRDKYxFGWNQbrAgNCYBPtg1Q3czCar9kEEmKk1M="
         }
       },
       "is_incremental": false,
diff --git a/xrefmap.yml b/xrefmap.yml
index 8534037d7..ac7436575 100644
--- a/xrefmap.yml
+++ b/xrefmap.yml
@@ -843,15 +843,15 @@ references:
   isSpec: "True"
   fullName: MagicOnion.Client.IStreamingHubDiagnosticHandler.OnRequestEnd
   nameWithType: IStreamingHubDiagnosticHandler.OnRequestEnd
-- uid: MagicOnion.Client.IStreamingHubDiagnosticHandler.OnRequestEnd``2(``0,Guid,System.String,``1)
-  name: OnRequestEnd<THub, TResponse>(THub, Guid, String, TResponse)
-  href: api/MagicOnion.Client.IStreamingHubDiagnosticHandler.html#MagicOnion_Client_IStreamingHubDiagnosticHandler_OnRequestEnd__2___0_Guid_System_String___1_
-  commentId: M:MagicOnion.Client.IStreamingHubDiagnosticHandler.OnRequestEnd``2(``0,Guid,System.String,``1)
-  name.vb: OnRequestEnd(Of THub, TResponse)(THub, Guid, String, TResponse)
-  fullName: MagicOnion.Client.IStreamingHubDiagnosticHandler.OnRequestEnd<THub, TResponse>(THub, Guid, System.String, TResponse)
-  fullName.vb: MagicOnion.Client.IStreamingHubDiagnosticHandler.OnRequestEnd(Of THub, TResponse)(THub, Guid, System.String, TResponse)
-  nameWithType: IStreamingHubDiagnosticHandler.OnRequestEnd<THub, TResponse>(THub, Guid, String, TResponse)
-  nameWithType.vb: IStreamingHubDiagnosticHandler.OnRequestEnd(Of THub, TResponse)(THub, Guid, String, TResponse)
+- uid: MagicOnion.Client.IStreamingHubDiagnosticHandler.OnRequestEnd``2(``0,Guid,System.String,``1,System.Nullable{Exception})
+  name: OnRequestEnd<THub, TResponse>(THub, Guid, String, TResponse, Nullable<Exception>)
+  href: api/MagicOnion.Client.IStreamingHubDiagnosticHandler.html#MagicOnion_Client_IStreamingHubDiagnosticHandler_OnRequestEnd__2___0_Guid_System_String___1_System_Nullable_Exception__
+  commentId: M:MagicOnion.Client.IStreamingHubDiagnosticHandler.OnRequestEnd``2(``0,Guid,System.String,``1,System.Nullable{Exception})
+  name.vb: OnRequestEnd(Of THub, TResponse)(THub, Guid, String, TResponse, Nullable(Of Exception))
+  fullName: MagicOnion.Client.IStreamingHubDiagnosticHandler.OnRequestEnd<THub, TResponse>(THub, Guid, System.String, TResponse, System.Nullable<Exception>)
+  fullName.vb: MagicOnion.Client.IStreamingHubDiagnosticHandler.OnRequestEnd(Of THub, TResponse)(THub, Guid, System.String, TResponse, System.Nullable(Of Exception))
+  nameWithType: IStreamingHubDiagnosticHandler.OnRequestEnd<THub, TResponse>(THub, Guid, String, TResponse, Nullable<Exception>)
+  nameWithType.vb: IStreamingHubDiagnosticHandler.OnRequestEnd(Of THub, TResponse)(THub, Guid, String, TResponse, Nullable(Of Exception))
 - uid: MagicOnion.Client.MagicOnionClient
   name: MagicOnionClient
   href: api/MagicOnion.Client.MagicOnionClient.html