diff --git a/QCloud.CosApi.Client/CosClient.cs b/QCloud.CosApi.Client/CosClient.cs
index 216c561..81d9047 100644
--- a/QCloud.CosApi.Client/CosClient.cs
+++ b/QCloud.CosApi.Client/CosClient.cs
@@ -19,12 +19,15 @@ public class CosClient
         private CosClientOptions _cosClientOptions;
         private const string BASE_ADDRESS = "http://sh.file.myqcloud.com/files/v2";
         private const int SIGN_EXPIRED_TIME = 180;
-        private readonly static HttpClient _httpClient = new HttpClient();
+        private readonly HttpClient _httpClient;
         private readonly ILogger _logger;
 
-        public CosClient(IOptions<CosClientOptions> cosClientOptions,
+        public CosClient(
+            HttpClient httpClient,
+            IOptions<CosClientOptions> cosClientOptions,
             ILoggerFactory loggerFactory)
         {
+            _httpClient = httpClient;
             _cosClientOptions = cosClientOptions.Value;
             _logger = loggerFactory.CreateLogger<CosClient>();
         }
diff --git a/QCloud.CosApi.Client/CosClientServiceCollectionExtensions.cs b/QCloud.CosApi.Client/CosClientServiceCollectionExtensions.cs
new file mode 100644
index 0000000..8763e0d
--- /dev/null
+++ b/QCloud.CosApi.Client/CosClientServiceCollectionExtensions.cs
@@ -0,0 +1,31 @@
+using Microsoft.Extensions.Configuration;
+using QCloud.CosApi.Client;
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Text;
+
+namespace Microsoft.Extensions.DependencyInjection
+{
+    public static class CosClientServiceCollectionExtensions
+    {
+        public static IServiceCollection AddCosClient(
+            this IServiceCollection services, 
+            IConfiguration configuration, 
+            string sectionName = "cosClient",
+            Action<HttpClient> configureClient = null)
+        {
+            services.Configure<CosClientOptions>(configuration.GetSection(sectionName));
+            if (configureClient == null)
+            {
+                services.AddHttpClient<CosClient>();
+            }
+            else
+            {
+                services.AddHttpClient<CosClient>(configureClient);
+            }
+
+            return services;
+        }
+    }
+}
diff --git a/QCloud.CosApi.Client/QCloud.CosApi.Client.csproj b/QCloud.CosApi.Client/QCloud.CosApi.Client.csproj
index d7019a4..092fa12 100644
--- a/QCloud.CosApi.Client/QCloud.CosApi.Client.csproj
+++ b/QCloud.CosApi.Client/QCloud.CosApi.Client.csproj
@@ -1,14 +1,17 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
-    <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
+    <Authors>Cnblogs team</Authors>
+    <PackageProjectUrl>https://github.com/cnblogs/cos-donet-sdk-v4</PackageProjectUrl>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Options" Version="2.0.0" />
-    <PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
+    <PackageReference Include="Microsoft.Extensions.Http" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Options" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="2.1.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="11.0.2" />
   </ItemGroup>
 
 </Project>
diff --git a/QCloud.CosApi.Sample/Program.cs b/QCloud.CosApi.Sample/Program.cs
index bd87014..7b73405 100644
--- a/QCloud.CosApi.Sample/Program.cs
+++ b/QCloud.CosApi.Sample/Program.cs
@@ -21,7 +21,7 @@ static async Task Main(string[] args)
             var filePath = args[0];
 
             var conf = new ConfigurationBuilder()
-                .SetBasePath(Directory.GetCurrentDirectory())
+                .SetBasePath(Directory.GetCurrentDirectory())                
                 .AddJsonFile("appsettings.json", true, true)
                 .AddJsonFile("appsettings.Development.json", true, true)
                 .Build();
@@ -31,9 +31,8 @@ static async Task Main(string[] args)
                 .AddConfiguration(conf.GetSection("Logging"))
                 .AddConsole());
 
-            services.AddOptions();
-            services.Configure<CosClientOptions>(conf.GetSection("cosClient"));
-            services.AddSingleton<CosClient>();
+            //services.AddOptions();
+            services.AddCosClient(conf);
 
             IServiceProvider serviceProvider = services.BuildServiceProvider();
             var cosClient = serviceProvider.GetService<CosClient>();
diff --git a/QCloud.CosApi.Sample/QCloud.CosApi.Sample.csproj b/QCloud.CosApi.Sample/QCloud.CosApi.Sample.csproj
index 9523946..3f5575a 100644
--- a/QCloud.CosApi.Sample/QCloud.CosApi.Sample.csproj
+++ b/QCloud.CosApi.Sample/QCloud.CosApi.Sample.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
@@ -14,15 +14,15 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Configuration" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Logging" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Configuration" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Options" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="2.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Configuration" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Options" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="2.1.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/cos_dotnet_sdk.suo b/cos_dotnet_sdk.suo
deleted file mode 100644
index 3ce08ab..0000000
Binary files a/cos_dotnet_sdk.suo and /dev/null differ
diff --git a/cos_dotnet_sdk/cos_dotnet_sdk.csproj b/cos_dotnet_sdk/cos_dotnet_sdk.csproj
index 0c1186b..404731f 100644
--- a/cos_dotnet_sdk/cos_dotnet_sdk.csproj
+++ b/cos_dotnet_sdk/cos_dotnet_sdk.csproj
@@ -5,7 +5,7 @@
     <TargetFramework>netstandard2.0</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="11.0.2" />
   </ItemGroup>
   <ItemGroup>
     <Folder Include="Properties\" />