diff --git a/.github/workflows/build-debug.yml b/.github/workflows/build-debug.yml
index 70c86f3c5..728faaea3 100644
--- a/.github/workflows/build-debug.yml
+++ b/.github/workflows/build-debug.yml
@@ -10,7 +10,6 @@ on:
       - '**.md'
       - .github/**
       - docs/**
-      - samples/**
   pull_request:
     branches:
       - main
@@ -18,7 +17,6 @@ on:
       - '**.md'
       - .github/**
       - docs/**
-      - samples/**
 
 env:
   BUILD_CONFIG: Debug
diff --git a/README.md b/README.md
index 6369159ab..d40bd5c78 100644
--- a/README.md
+++ b/README.md
@@ -1066,12 +1066,12 @@ Before creating a channel in your application, you need to initialize the provid
 public static void OnRuntimeInitialize()
 {
     // Initialize gRPC channel provider when the application is loaded.
-    GrpcChannelProviderHost.Initialize(new DefaultGrpcChannelProvider(new []
+    GrpcChannelProviderHost.Initialize(new DefaultGrpcChannelProvider(() => new GrpcChannelOptions()
     {
-        // send keepalive ping every 5 second, default is 2 hours
-        new ChannelOption("grpc.keepalive_time_ms", 5000),
-        // keepalive ping time out after 5 seconds, default is 20 seconds
-        new ChannelOption("grpc.keepalive_timeout_ms", 5 * 1000),
+        HttpHandler = new YetAnotherHttpHandler()
+        {
+            Http2Only = true,
+        },
     }));
 }
 ```
diff --git a/samples/ChatApp/ChatApp.Shared/ChatApp.Shared.csproj b/samples/ChatApp/ChatApp.Shared/ChatApp.Shared.csproj
index 6ec29391a..306985ff3 100644
--- a/samples/ChatApp/ChatApp.Shared/ChatApp.Shared.csproj
+++ b/samples/ChatApp/ChatApp.Shared/ChatApp.Shared.csproj
@@ -4,12 +4,6 @@
     <TargetFramework>netstandard2.0</TargetFramework>
   </PropertyGroup>
 
-  <ItemGroup>
-    <None Remove="**\package.json" />
-    <None Remove="**\*.asmdef" />
-    <None Remove="**\*.meta" />
-  </ItemGroup>
-
   <ItemGroup>
     <ProjectReference Include="..\..\..\src\MagicOnion.Abstractions\MagicOnion.Abstractions.csproj" />
   </ItemGroup>
diff --git a/samples/ChatApp/ChatApp.Shared/Directory.Build.props b/samples/ChatApp/ChatApp.Shared/Directory.Build.props
index 26047f8f5..5f2b4b91c 100644
--- a/samples/ChatApp/ChatApp.Shared/Directory.Build.props
+++ b/samples/ChatApp/ChatApp.Shared/Directory.Build.props
@@ -1,14 +1,16 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
     <!--
-      prior to .NET 8
-      <BaseIntermediateOutputPath>.artifacts\obj\</BaseIntermediateOutputPath>
-		  <BaseOutputPath>.artifacts\bin\</BaseOutputPath>
-    -->
-
-    <!-- after .NET 8: https://learn.microsoft.com/en-us/dotnet/core/sdk/artifacts-output -->
-    <!-- Unity ignores . prefix folder -->
+    Override the output path of build artifacts.
+    This is necessary to change the path to one with a dot(.) prefix to hide generated items from Unity.
+  -->
+  <PropertyGroup>
+    <!-- Using .NET 8 and later, use ArtifactsPath property. -->
+    <!-- https://learn.microsoft.com/en-us/dotnet/core/sdk/artifacts-output -->
     <ArtifactsPath>$(MSBuildThisFileDirectory).artifacts</ArtifactsPath>
+    <!-- Using .NET 7 and ealier, use BaseIntermediateOutputPath and BaseOutputPath property instead. -->
+    <!-- NOTE: Currently, even if .NET 8 SDK is installed, MessagePack.Generator still requires these properties to be set. -->
+    <BaseIntermediateOutputPath>.artifacts\obj\</BaseIntermediateOutputPath>
+    <BaseOutputPath>.artifacts\bin\</BaseOutputPath>
   </PropertyGroup>
 </Project>
diff --git a/samples/ChatApp/ChatApp.Shared/Directory.Build.targets b/samples/ChatApp/ChatApp.Shared/Directory.Build.targets
new file mode 100644
index 000000000..44515bfd9
--- /dev/null
+++ b/samples/ChatApp/ChatApp.Shared/Directory.Build.targets
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <!-- Hide Unity-specific files from Visual Studio and .NET SDK -->
+  <ItemGroup>
+    <None Remove="**\package.json" />
+    <None Remove="**\*.asmdef" />
+    <None Remove="**\*.meta" />
+  </ItemGroup>
+
+  <!-- Hide build artifacts from Visual Studio and .NET SDK -->
+  <ItemGroup>
+    <None Remove=".artifacts\**\**.*" />
+    <None Remove="obj\**\*.*;bin\**\*.*" />
+    <Compile Remove=".artifacts\**\**.*" />
+    <Compile Remove="bin\**\*.*;obj\**\*.*" />
+    <EmbeddedResource Remove=".artifacts\**\**.*" />
+    <EmbeddedResource Remove="bin\**\*.*;obj\**\*.*" />
+  </ItemGroup>
+</Project>
diff --git a/samples/ChatApp/ChatApp.Shared/Directory.Build.targets.meta b/samples/ChatApp/ChatApp.Shared/Directory.Build.targets.meta
new file mode 100644
index 000000000..4c95937f6
--- /dev/null
+++ b/samples/ChatApp/ChatApp.Shared/Directory.Build.targets.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: bab152c83c191c643a7056bc184c530b
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Unity/DefaultGrpcChannelProvider.cs b/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Unity/DefaultGrpcChannelProvider.cs
index 525c31905..004226bbe 100644
--- a/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Unity/DefaultGrpcChannelProvider.cs
+++ b/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Unity/DefaultGrpcChannelProvider.cs
@@ -23,7 +23,8 @@ public DefaultGrpcChannelProvider(GrpcCCoreChannelOptions channelOptions) : base
     public class DefaultGrpcChannelProvider : GrpcNetClientGrpcChannelProvider
     {
         public DefaultGrpcChannelProvider() : base() {}
-        public DefaultGrpcChannelProvider(GrpcChannelOptions channelOptions) : base(channelOptions) {}
+        [Obsolete("Use constructor with a GrpcChannelOptions factory overload instead. If you pass a GrpcChannelOptions directly, HttpClient/HttpHandler may be reused unintentionally.")]
+        public DefaultGrpcChannelProvider(GrpcChannelOptions channelOptions) : base(channelOptions) { }
         public DefaultGrpcChannelProvider(Func<GrpcChannelOptions> channelOptionsFactory) : base(channelOptionsFactory) {}
     }
 #endif
diff --git a/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Unity/GrpcNetClientGrpcChannelProvider.cs b/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Unity/GrpcNetClientGrpcChannelProvider.cs
index b5a1a47db..d491f41a9 100644
--- a/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Unity/GrpcNetClientGrpcChannelProvider.cs
+++ b/src/MagicOnion.Client.Unity/Assets/Scripts/MagicOnion/MagicOnion.Unity/GrpcNetClientGrpcChannelProvider.cs
@@ -13,10 +13,11 @@ public class GrpcNetClientGrpcChannelProvider : GrpcChannelProviderBase
     {
         readonly Func<GrpcChannelOptions> defaultChannelOptionsFactory;
         public GrpcNetClientGrpcChannelProvider()
-            : this(new GrpcChannelOptions())
+            : this(() => new GrpcChannelOptions())
         {
         }
 
+        [Obsolete("Use constructor with a GrpcChannelOptions factory overload instead. If you pass a GrpcChannelOptions directly, HttpClient/HttpHandler may be reused unintentionally.")]
         public GrpcNetClientGrpcChannelProvider(GrpcChannelOptions options)
             : this(() => options)
         {