diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a63be3..137b81b 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,15 @@
-# 0.0.4-beta # 0.0.4-beta 2023-02-20
+# 0.0.5-beta 2023-04-14
+
+### G42Cloud SDK Core
+
+- _Features_
+  - None
+- _Bug Fix_
+  - None
+- _Change_
+  - Optimize the code structure.
+
+# 0.0.4-beta 2023-02-20
 
 ### G42Cloud SDK CBR
 
diff --git a/Core/Auth/IamService.cs b/Core/Auth/IamService.cs
index 4b8f898..6d09cc8 100755
--- a/Core/Auth/IamService.cs
+++ b/Core/Auth/IamService.cs
@@ -82,7 +82,7 @@ public static string KeystoneListProjects(SdkHttpClient client, HttpRequest requ
             var message = client.InitHttpRequest(request, true);
             try
             {
-                var response = client.DoHttpRequest(message).Result;
+                var response = TaskUtils.RunSync(() => client.DoHttpRequest(message));
                 if ((int)response.StatusCode >= 400)
                 {
                     throw ExceptionUtils.GetException(response);
@@ -105,7 +105,7 @@ public static string KeystoneListProjects(SdkHttpClient client, HttpRequest requ
             }
             catch (AggregateException aggregateException)
             {
-                throw new ConnectionException(ExceptionUtils.GetMessageFromAggregateException(aggregateException));
+                throw ExceptionUtils.HandleException(aggregateException);
             }
         }
 
@@ -129,7 +129,7 @@ public static string KeystoneListAuthDomains(SdkHttpClient client, HttpRequest r
             var message = client.InitHttpRequest(request, true);
             try
             {
-                var response = client.DoHttpRequest(message).Result;
+                var response = TaskUtils.RunSync(() => client.DoHttpRequest(message));
                 if ((int)response.StatusCode >= 400)
                 {
                     throw ExceptionUtils.GetException(response);
@@ -148,7 +148,7 @@ public static string KeystoneListAuthDomains(SdkHttpClient client, HttpRequest r
             }
             catch (AggregateException aggregateException)
             {
-                throw new ConnectionException(ExceptionUtils.GetMessageFromAggregateException(aggregateException));
+                throw ExceptionUtils.HandleException(aggregateException);
             }
         }
     }
diff --git a/Core/Client.cs b/Core/Client.cs
index 8b79f5e..2932081 100755
--- a/Core/Client.cs
+++ b/Core/Client.cs
@@ -22,7 +22,10 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Net;
 using System.Net.Http;
+using System.Runtime.CompilerServices;
+using System.Threading;
 using System.Threading.Tasks;
 using G42Cloud.SDK.Core.Auth;
 using Microsoft.Extensions.Logging;
@@ -34,7 +37,10 @@ public class Client
     {
         public class ClientBuilder<T> where T : Client
         {
-            private string[] CredentialType { get; } = {nameof(BasicCredentials)};
+            private string[] CredentialType { get; } =
+            {
+                nameof(BasicCredentials)
+            };
 
             public ClientBuilder()
             {
@@ -48,7 +54,7 @@ public ClientBuilder(string credentialType)
             private Credentials _credentials;
             private HttpConfig _httpConfig;
             private Region _region;
-            private string _endPoint;
+            private List<string> _endpoints;
             private bool _enableLogging;
             private LogLevel _logLevel = LogLevel.Information;
             private HttpHandler _httpHandler;
@@ -74,10 +80,19 @@ public ClientBuilder<T> WithRegion(Region region)
                 this._region = region;
                 return this;
             }
+            
+            [Obsolete("As of 3.1.26, because of the support of the multi-endpoint feature, use WithEndPoints instead")]
+            public ClientBuilder<T> WithEndPoint(string endpoint)
+            {
+                return this.WithEndPoints(new List<string>
+                {
+                    endpoint
+                });
+            }
 
-            public ClientBuilder<T> WithEndPoint(string endPoint)
+            public ClientBuilder<T> WithEndPoints(List<string> endpoints)
             {
-                this._endPoint = endPoint;
+                this._endpoints = endpoints;
                 return this;
             }
 
@@ -120,24 +135,29 @@ public T Build()
 
                 if (this._region != null)
                 {
-                    this._endPoint = _region.Endpoint;
+                    this._endpoints = this._region.Endpoints;
                     this._credentials = _credentials.ProcessAuthParams(client._sdkHttpClient, _region.Id);
                     this._credentials.ProcessDerivedAuthParams(_derivedAuthServiceName, _region.Id);
                 }
 
-                if (!_endPoint.StartsWith(HttpScheme))
+                for (var i = 0; i < _endpoints.Count; i++)
                 {
-                    _endPoint = HttpsScheme + "://" + _endPoint;
+                    var endpoint = _endpoints[i];
+                    if (!endpoint.StartsWith(HttpScheme))
+                    {
+                        _endpoints[i] = HttpsScheme + "://" + endpoint;
+                    }
                 }
 
                 client.WithCredential(this._credentials)
-                    .WithEndPoint(this._endPoint);
+                    .WithEndPoints(this._endpoints);
 
-                return (T) client;
+                return (T)client;
             }
         }
 
-        private string _endpoint;
+        private List<string> _endpoints;
+        private volatile int _endpointIndex;
         private HttpConfig _httpConfig;
         private Credentials _credential;
 
@@ -158,12 +178,13 @@ private Client WithHttpConfig(HttpConfig httpConfig)
             return this;
         }
 
-        private Client WithEndPoint(string endPoint)
+        private Client WithEndPoints(List<string> endpoints)
         {
-            this._endpoint = endPoint;
+            this._endpoints = endpoints;
             return this;
         }
 
+
         private void InitSdkHttpClient(HttpHandler httpHandler, bool enableLogging, LogLevel logLevel)
         {
             this._sdkHttpClient =
@@ -194,16 +215,33 @@ private async Task<HttpResponseMessage> _async_http(string url, string method, S
             }
             catch (AggregateException aggregateException)
             {
-                throw new ConnectionException(ExceptionUtils.GetMessageFromAggregateException(aggregateException));
+                throw ExceptionUtils.HandleException(aggregateException);
             }
         }
 
+        [MethodImpl(MethodImplOptions.Synchronized)]
         protected HttpResponseMessage DoHttpRequestSync(string methodType, SdkRequest request)
         {
-            var url = GetRealEndpoint(request)
-                      + HttpUtils.AddUrlPath(request.Path, _credential.GetPathParamDictionary())
-                      + (IsNullOrEmpty(request.QueryParams) ? "" : "?" + request.QueryParams);
-            return _sync_http(url, methodType.ToUpper(), request);
+            while (true)
+            {
+                var url = GetRealEndpoint(request) + HttpUtils.AddUrlPath(request.Path, _credential.GetPathParamDictionary())
+                                                   + (IsNullOrEmpty(request.QueryParams) ? "" : "?" + request.QueryParams);
+                try
+                {
+                    return _sync_http(url, methodType.ToUpper(), request);
+                }
+                catch (HostUnreachableException hostUnreachableException)
+                {
+                    if (this._endpointIndex < this._endpoints.Count - 1)
+                    {
+                        Interlocked.Increment(ref _endpointIndex);
+                    }
+                    else
+                    {
+                        throw hostUnreachableException;
+                    }
+                }
+            }
         }
 
         private HttpResponseMessage _sync_http(string url, string method, SdkRequest sdkRequest)
@@ -222,23 +260,24 @@ private HttpResponseMessage _sync_http(string url, string method, SdkRequest sdk
             }
             catch (AggregateException aggregateException)
             {
-                throw new ConnectionException(ExceptionUtils.GetMessageFromAggregateException(aggregateException));
+                throw ExceptionUtils.HandleException(aggregateException);
             }
         }
 
         private string GetRealEndpoint(SdkRequest request)
         {
+            var endpoint = this._endpoints[_endpointIndex];
             if (String.IsNullOrEmpty(request.Cname))
             {
-                return _endpoint;
+                return endpoint;
             }
 
-            return _endpoint.Insert(8, request.Cname + ".");
-        } 
+            return endpoint.Insert(8, request.Cname + ".");
+        }
 
         private HttpResponseMessage GetResult(HttpResponseMessage responseMessage)
         {
-            if ((int) responseMessage.StatusCode < 400)
+            if ((int)responseMessage.StatusCode < 400)
             {
                 return responseMessage;
             }
@@ -274,4 +313,4 @@ private void UpdateHeaders(HttpRequest request, Dictionary<string, string> heade
             request.Headers.Add(XRequestAgent, "g42cloud-usdk-net/3.0");
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Core/Exception/ConnectionException.cs b/Core/Exception/ConnectionException.cs
index 6683af3..3ed4716 100755
--- a/Core/Exception/ConnectionException.cs
+++ b/Core/Exception/ConnectionException.cs
@@ -19,15 +19,20 @@
  * under the License.
  */
 
+using System;
+
 namespace G42Cloud.SDK.Core
 {
     public class ConnectionException : SdkException
     {
-        public string ErrorMessage { get; set; }
-
         public ConnectionException(string errorMessage)
         {
             this.ErrorMessage = errorMessage;
         }
+
+        public ConnectionException(string errorMessage, Exception innerException) : base(errorMessage, innerException)
+        {
+            this.ErrorMessage = errorMessage;
+        }
     }
 }
\ No newline at end of file
diff --git a/Core/Exception/HostUnreachableException.cs b/Core/Exception/HostUnreachableException.cs
index 06992bd..bb9f3d3 100755
--- a/Core/Exception/HostUnreachableException.cs
+++ b/Core/Exception/HostUnreachableException.cs
@@ -19,13 +19,20 @@
  * under the License.
  */
 
+using System;
+
 namespace G42Cloud.SDK.Core
 {
     public class HostUnreachableException : ConnectionException
     {
-        public HostUnreachableException(string errorMessage):base(errorMessage)
+        public HostUnreachableException(string errorMessage) : base(errorMessage)
+        {
+            this.ErrorMessage = errorMessage;
+        }
+
+        public HostUnreachableException(string errorMessage, Exception innerException) : base(errorMessage, innerException)
         {
             this.ErrorMessage = errorMessage;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Core/Exception/RequestTimeoutException.cs b/Core/Exception/RequestTimeoutException.cs
index 96ce405..6b60083 100755
--- a/Core/Exception/RequestTimeoutException.cs
+++ b/Core/Exception/RequestTimeoutException.cs
@@ -19,15 +19,20 @@
  * under the License.
  */
 
+using System;
+
 namespace G42Cloud.SDK.Core
 {
     public class RequestTimeoutException : SdkException
     {
-        public string ErrorMessage { get; set; }
-
         public RequestTimeoutException(string errorMessage)
         {
             this.ErrorMessage = errorMessage;
         }
+        
+        public RequestTimeoutException(string errorMessage, Exception innerException) : base(errorMessage, innerException)
+        {
+            this.ErrorMessage = errorMessage;
+        }
     }
 }
\ No newline at end of file
diff --git a/Core/Exception/SdkError.cs b/Core/Exception/SdkError.cs
index 8371758..c5af701 100755
--- a/Core/Exception/SdkError.cs
+++ b/Core/Exception/SdkError.cs
@@ -31,14 +31,15 @@ public class SdkError : SdkResponse
         [XmlElement("Message")]
         public string ErrorMsg { get; set; }
 
-        [JsonProperty("error_code", NullValueHandling = NullValueHandling.Ignore)]
-        [XmlElement("Code")]
+        [JsonProperty("error_code", NullValueHandling = NullValueHandling.Ignore)] [XmlElement("Code")]
         public string ErrorCode;
 
-        [JsonProperty("request_id", NullValueHandling = NullValueHandling.Ignore)]
-        [XmlElement("RequestId")]
+        [JsonProperty("request_id", NullValueHandling = NullValueHandling.Ignore)] [XmlElement("RequestId")]
         public string RequestId;
 
+        [JsonProperty("encoded_authorization_message", NullValueHandling = NullValueHandling.Ignore)] [XmlElement("EncodedAuthorizationMessage")]
+        public string EncodedAuthorizationMessage;
+
         public SdkError()
         {
         }
@@ -49,16 +50,16 @@ public SdkError(string errorCode, string errorMsg, string requestId)
             this.ErrorMsg = errorMsg;
             this.RequestId = requestId;
         }
-        
+
         public SdkError(string errorCode, string errorMsg)
         {
             this.ErrorCode = errorCode;
             this.ErrorMsg = errorMsg;
         }
-        
+
         public SdkError(string errorMsg)
         {
             this.ErrorMsg = errorMsg;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Core/Exception/SdkException.cs b/Core/Exception/SdkException.cs
index a646055..9fcceb2 100755
--- a/Core/Exception/SdkException.cs
+++ b/Core/Exception/SdkException.cs
@@ -25,5 +25,20 @@ namespace G42Cloud.SDK.Core
 {
     public class SdkException : Exception
     {
+        protected SdkException()
+        {
+            
+        }
+        public string ErrorMessage { get; set; }
+
+        public SdkException(string errorMessage) : base(errorMessage)
+        {
+            this.ErrorMessage = errorMessage;
+        }
+
+        public SdkException(string errorMessage, Exception innerException) : base(errorMessage, innerException)
+        {
+            this.ErrorMessage = errorMessage;
+        }
     }
 }
\ No newline at end of file
diff --git a/Core/Exception/ServiceResponseException.cs b/Core/Exception/ServiceResponseException.cs
index 220933a..4e192cc 100755
--- a/Core/Exception/ServiceResponseException.cs
+++ b/Core/Exception/ServiceResponseException.cs
@@ -31,12 +31,15 @@ public class ServiceResponseException : SdkException
 
         public string RequestId { get; set; }
 
+        public string EncodedAuthorizationMessage { get; set; }
+
         public ServiceResponseException(int? httpStatusCode, SdkError sdkError)
         {
             this.HttpStatusCode = httpStatusCode;
             this.ErrorCode = sdkError.ErrorCode;
             this.ErrorMsg = sdkError.ErrorMsg;
             this.RequestId = sdkError.RequestId;
+            this.EncodedAuthorizationMessage = sdkError.EncodedAuthorizationMessage;
         }
 
         public static ServiceResponseException MapException(int? httpStatusCode, SdkError sdkError)
@@ -54,4 +57,4 @@ public static ServiceResponseException MapException(int? httpStatusCode, SdkErro
             return new ServiceResponseException(httpStatusCode, sdkError);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Core/Exception/SslHandShakeException.cs b/Core/Exception/SslHandShakeException.cs
index aac88aa..d592d99 100755
--- a/Core/Exception/SslHandShakeException.cs
+++ b/Core/Exception/SslHandShakeException.cs
@@ -19,13 +19,20 @@
  * under the License.
  */
 
+using System;
+
 namespace G42Cloud.SDK.Core
 {
     public class SslHandShakeException : ConnectionException
     {
-        public SslHandShakeException(string errorMessage):base(errorMessage)
+        public SslHandShakeException(string errorMessage) : base(errorMessage)
+        {
+            this.ErrorMessage = errorMessage;
+        }
+
+        public SslHandShakeException(string errorMessage, Exception innerException) : base(errorMessage, innerException)
         {
             this.ErrorMessage = errorMessage;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Core/Http/HttpRequest.cs b/Core/Http/HttpRequest.cs
index 82c7aad..fd67d86 100755
--- a/Core/Http/HttpRequest.cs
+++ b/Core/Http/HttpRequest.cs
@@ -23,7 +23,6 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Net;
-using System.Web;
 
 namespace G42Cloud.SDK.Core
 {
@@ -87,11 +86,11 @@ private void ParseQueryParam()
                 foreach (var kv in Url.Query.Substring(1).Split('&'))
                 {
                     var spl = kv.Split(new char[] {'='}, 2);
-                    var key = HttpUtility.UrlDecode(spl[0]);
+                    var key = WebUtility.UrlDecode(spl[0]);
                     var value = "";
                     if (spl.Length > 1)
                     {
-                        value = HttpUtility.UrlDecode(spl[1]);
+                        value = WebUtility.UrlDecode(spl[1]);
                     }
 
                     if (QueryParam.ContainsKey(key))
diff --git a/Core/Region/Region.cs b/Core/Region/Region.cs
index e6df1d9..8602a66 100755
--- a/Core/Region/Region.cs
+++ b/Core/Region/Region.cs
@@ -1,21 +1,54 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
 namespace G42Cloud.SDK.Core
 {
     public class Region
     {
         public string Id { get; set; }
 
-        public string Endpoint { get; set; }
+        private List<string> _endpoints;
+
+        [Obsolete("As of 3.1.26, because of the support of the multi-endpoint feature, use Endpoints instead")]
+        public string Endpoint
+        {
+            get { return _endpoints == null || _endpoints.Count == 0 ? null : _endpoints[0]; }
+            set
+            {
+                Endpoints = new List<string>
+                {
+                    value
+                };
+            }
+        }
 
-        public Region(string id, string endpoint)
+        public List<string> Endpoints
+        {
+            get { return _endpoints; }
+            set { _endpoints = value; }
+        }
+
+
+        public Region(string id, params string[] endpoints)
         {
             Id = id;
-            Endpoint = endpoint;
+            Endpoints = endpoints.ToList();
         }
 
+        [Obsolete("As of 3.1.26, because of the support of the multi-endpoint feature, use WithEndpointsOverride instead")]
         public Region WithEndpointOverride(string newEndpoint)
         {
-            Endpoint = newEndpoint;
+            return WithEndpointsOverride(new List<string>
+            {
+                newEndpoint
+            });
+        }
+
+        public Region WithEndpointsOverride(List<string> endpoints)
+        {
+            Endpoints = endpoints;
             return this;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Core/Signer/DerivedSigner.cs b/Core/Signer/DerivedSigner.cs
index da21d1a..7918277 100755
--- a/Core/Signer/DerivedSigner.cs
+++ b/Core/Signer/DerivedSigner.cs
@@ -12,13 +12,14 @@ public class DerivedSigner : Signer
 
         public void Sign(HttpRequest request, string regionId, string derivedAuthServiceName)
         {
+            verifyAkSk();
             if (string.IsNullOrEmpty(regionId))
             {
-                throw new ArgumentException("regionId in credential is required when using derived auth");
+                throw new ArgumentException("regionId is required in credentials when using derived auth");
             }
             if (string.IsNullOrEmpty(derivedAuthServiceName))
             {
-                throw new ArgumentException("derivedAuthServiceName in credential is required when using derived auth");
+                throw new ArgumentException("derivedAuthServiceName is required in credentials when using derived auth");
             }
             // Add X-Sdk-Date
             var time = request.Headers.GetValues(HeaderXDate);
diff --git a/Core/Signer/Signer.cs b/Core/Signer/Signer.cs
index 8338bf9..fff1552 100755
--- a/Core/Signer/Signer.cs
+++ b/Core/Signer/Signer.cs
@@ -38,13 +38,18 @@ public partial class Signer
         protected const string HeaderHost = "host";
         protected const string HeaderAuthorization = "Authorization";
         const string HeaderContentSha256 = "X-Sdk-Content-Sha256";
-        private readonly HashSet<string> _unsignedHeaders = new HashSet<string> {"content-type"};
+
+        private readonly HashSet<string> _unsignedHeaders = new HashSet<string>
+        {
+            "content-type"
+        };
 
         public string Key { get; set; }
         public string Secret { get; set; }
 
         public void Sign(HttpRequest request)
         {
+            verifyAkSk();
             var time = request.Headers.GetValues(HeaderXDate);
             DateTime t;
             if (time == null)
@@ -73,6 +78,18 @@ public void Sign(HttpRequest request)
             request.Headers.Set(HeaderAuthorization, authValue);
         }
 
+        protected void verifyAkSk()
+        {
+            if (string.IsNullOrEmpty(Key))
+            {
+                throw new ArgumentException("Ak is required in credentials");
+            }
+            if (string.IsNullOrEmpty(Secret))
+            {
+                throw new ArgumentException("Sk is required in credentials");
+            }
+        }
+
         /// <summary>
         /// Build a CanonicalRequest from a regular request string
         /// CanonicalRequest consists of several parts:
@@ -145,9 +162,9 @@ private string CanonicalHeaders(HttpRequest request)
         protected List<string> ProcessSignedHeaders(HttpRequest request)
         {
             var signedHeaders = (from key in request.Headers.AllKeys
-                let keyLower = key.ToLower()
-                where !_unsignedHeaders.Contains(keyLower)
-                select key.ToLower()).ToList();
+                                 let keyLower = key.ToLower()
+                                 where !_unsignedHeaders.Contains(keyLower)
+                                 select key.ToLower()).ToList();
 
             signedHeaders.Sort(CompareOrdinal);
             return signedHeaders;
@@ -201,10 +218,10 @@ private static char GetHexValue(int i)
         {
             if (i < 10)
             {
-                return (char) (i + '0');
+                return (char)(i + '0');
             }
 
-            return (char) (i - 10 + 'a');
+            return (char)(i - 10 + 'a');
         }
 
         protected string StringToSign(string canonicalRequest, DateTime t)
@@ -232,4 +249,4 @@ private byte[] HMacSha256(byte[] keyByte, string message)
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Core/Utils/ExceptionUtils.cs b/Core/Utils/ExceptionUtils.cs
index 2fc3e70..0ccf938 100755
--- a/Core/Utils/ExceptionUtils.cs
+++ b/Core/Utils/ExceptionUtils.cs
@@ -22,6 +22,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Net;
 using System.Net.Http;
 using System.Text;
 using Newtonsoft.Json;
@@ -33,6 +34,11 @@ namespace G42Cloud.SDK.Core
     public static class ExceptionUtils
     {
         private const string XRequestId = "X-Request-Id";
+        private const string EncodedAuthorizationMessage = "encoded_authorization_message";
+        private const string ErrorCode = "error_code";
+        private const string ErrorMsg = "error_msg";
+        private const string Code = "code";
+        private const string Message = "message";
 
         public static string GetMessageFromAggregateException(AggregateException aggregateException)
         {
@@ -45,11 +51,51 @@ public static string GetMessageFromAggregateException(AggregateException aggrega
             return messages.ToString();
         }
 
+        public static SdkException HandleException(Exception exception)
+        {
+            if (exception is AggregateException)
+            {
+                if (exception.InnerException is SdkException sdkException)
+                {
+                    return sdkException;
+                }
+
+                if (exception.InnerException is HttpRequestException httpRequestException)
+                {
+                    if (httpRequestException.InnerException == null)
+                    {
+                        return new ConnectionException(httpRequestException.Message, exception);
+                    }
+
+                    if (httpRequestException.InnerException is WebException webException)
+                    {
+                        switch (webException.Status)
+                        {
+                            case WebExceptionStatus.NameResolutionFailure:
+                                return new HostUnreachableException(webException.Message, exception);
+                            case WebExceptionStatus.TrustFailure:
+                                return new SslHandShakeException(webException.Message, exception);
+                            case WebExceptionStatus.Timeout:
+                                return new RequestTimeoutException(webException.Message, exception);
+                            default:
+                                return new ConnectionException(webException.Message, exception);
+                        }
+                    }
+                }
+
+                if (exception.InnerException != null)
+                {
+                    return new SdkException(exception.InnerException.Message, exception.InnerException);
+                }
+            }
+            return new SdkException(exception.Message, exception);
+        }
+
         public static ServiceResponseException GetException(HttpResponseMessage responseMessage)
         {
             var result = new SdkResponse
             {
-                HttpStatusCode = (int) responseMessage.StatusCode,
+                HttpStatusCode = (int)responseMessage.StatusCode,
                 HttpHeaders = responseMessage.Headers.ToString(),
                 HttpBody = Encoding.UTF8.GetString(responseMessage.Content.ReadAsByteArrayAsync().Result)
             };
@@ -64,16 +110,19 @@ public static ServiceResponseException GetException(HttpResponseMessage response
             try
             {
                 sdkError = responseMessage.Content.Headers.ContentType.MediaType.Equals("application/xml")
-                               ? XmlUtils.DeSerialize<SdkError>(result) 
+                               ? XmlUtils.DeSerialize<SdkError>(result)
                                : GetSdkErrorFromResponse(requestId, result);
             }
             catch (Exception exception)
             {
                 throw new ServerResponseException(result.HttpStatusCode,
-                    new SdkError {ErrorMsg = exception.Message});
+                    new SdkError
+                    {
+                        ErrorMsg = exception.Message
+                    });
             }
 
-            throw ServiceResponseException.MapException((int) responseMessage.StatusCode, sdkError);
+            throw ServiceResponseException.MapException((int)responseMessage.StatusCode, sdkError);
         }
 
         private static SdkError GetSdkErrorFromResponse(string requestId, SdkResponse response)
@@ -87,14 +136,18 @@ private static SdkError GetSdkErrorFromResponse(string requestId, SdkResponse re
                     sdkError = HandleServiceCommonException(response);
                 }
             }
-            catch (Exception)
+            catch (JsonReaderException)
             {
-                sdkError = new SdkError();
+                sdkError = new SdkError(response.HttpBody);
+            }
+            catch (Exception e)
+            {
+                sdkError = new SdkError(e.Message);
             }
 
             if (IsNullOrEmpty(sdkError.ErrorMsg))
             {
-                sdkError = HandleServiceSpecException(response);
+                sdkError = new SdkError(response.HttpBody);
             }
 
             if (IsNullOrEmpty(sdkError.RequestId))
@@ -105,38 +158,51 @@ private static SdkError GetSdkErrorFromResponse(string requestId, SdkResponse re
             return sdkError;
         }
 
-        private static SdkError HandleServiceSpecException(SdkResponse response)
+        private static void ProcessSdkError(JObject jObject, SdkError sdkError)
         {
-            return new SdkError();
-        }
+            if (jObject.ContainsKey(EncodedAuthorizationMessage))
+            {
+                sdkError.EncodedAuthorizationMessage = jObject[EncodedAuthorizationMessage].ToString();
+            }
 
-        private static SdkError HandleServiceCommonException(SdkResponse response)
-        {
-            var exception = JsonConvert.DeserializeObject<Dictionary<string, object>>(response.HttpBody);
-            if (exception.ContainsKey("code") && exception.ContainsKey("message"))
+            if (jObject.ContainsKey(ErrorCode) && jObject.ContainsKey(ErrorMsg))
             {
-                return new SdkError(exception["code"].ToString(), exception["message"].ToString());
+                sdkError.ErrorCode = jObject[ErrorCode].ToString();
+                sdkError.ErrorMsg = jObject[ErrorMsg].ToString();
+                return;
             }
 
-            foreach (var item in exception)
+            if (jObject.ContainsKey(Code) && jObject.ContainsKey(Message))
             {
-                var jValue = JObject.Parse(item.Value.ToString());
-                var errorCode = jValue["error_code"];
-                var errorMsg = jValue["error_msg"];
-                if (errorCode != null && errorMsg != null)
-                {
-                    return new SdkError(errorCode.ToString(), errorMsg.ToString());
-                }
+                sdkError.ErrorCode = jObject[Code].ToString();
+                sdkError.ErrorMsg = jObject[Message].ToString();
+                return;
+            }
 
-                var message = jValue["message"];
-                var code = jValue["code"];
-                if (message != null && code != null)
+            foreach (var pair in jObject)
+            {
+                if (pair.Value is JObject value)
                 {
-                    return new SdkError(code.ToString(), message.ToString());
+                    ProcessSdkError(value, sdkError);
                 }
             }
+        }
+
+        private static SdkError HandleServiceCommonException(SdkResponse response)
+        {
+            var errorDict = JsonConvert.DeserializeObject<JObject>(response.HttpBody);
+            if (errorDict == null)
+            {
+                return new SdkError(response.HttpBody);
+            }
 
-            return new SdkError(response.HttpBody);
+            var sdkError = new SdkError();
+            ProcessSdkError(errorDict, sdkError);
+            if (sdkError.ErrorMsg == null)
+            {
+                sdkError.ErrorMsg = response.HttpBody;
+            }
+            return sdkError;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Core/Utils/TaskUtils.cs b/Core/Utils/TaskUtils.cs
new file mode 100755
index 0000000..68ab087
--- /dev/null
+++ b/Core/Utils/TaskUtils.cs
@@ -0,0 +1,104 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace G42Cloud.SDK.Core
+{
+    public static class TaskUtils
+    {
+        public static T RunSync<T>(Func<Task<T>> task)
+        {
+            var oldContext = SynchronizationContext.Current;
+            if (oldContext == null)
+            {
+                return task.Invoke().Result;
+            }
+
+            var exclusiveContext = new ExclusiveSynchronizationContext();
+            SynchronizationContext.SetSynchronizationContext(exclusiveContext);
+            var result = default(T);
+            exclusiveContext.Post(async _ =>
+            {
+                try
+                {
+                    result = await task();
+                }
+                catch (Exception e)
+                {
+                    exclusiveContext.InnerException = e;
+                    throw;
+                }
+                finally
+                {
+                    exclusiveContext.EndMessageLoop();
+                }
+            }, null);
+            exclusiveContext.BeginMessageLoop();
+            SynchronizationContext.SetSynchronizationContext(oldContext);
+            return result;
+        }
+
+        private class ExclusiveSynchronizationContext : SynchronizationContext
+        {
+            public Exception InnerException { get; set; }
+
+            private bool _done;
+
+            private readonly AutoResetEvent _workItemsWaiting = new AutoResetEvent(false);
+
+            private readonly Queue<Tuple<SendOrPostCallback, object>> _items = new Queue<Tuple<SendOrPostCallback, object>>();
+
+            public override void Send(SendOrPostCallback d, object state)
+            {
+                throw new NotSupportedException("Cannot send to the same thread");
+            }
+
+            public override void Post(SendOrPostCallback d, object state)
+            {
+                lock (_items)
+                {
+                    _items.Enqueue(Tuple.Create(d, state));
+                }
+                _workItemsWaiting.Set();
+            }
+
+            public void EndMessageLoop()
+            {
+                Post(_ => _done = true, null);
+            }
+
+            public void BeginMessageLoop()
+            {
+                while (!_done)
+                {
+                    Tuple<SendOrPostCallback, object> task = null;
+                    lock (_items)
+                    {
+                        if (_items.Count > 0)
+                        {
+                            task = _items.Dequeue();
+                        }
+                    }
+                    if (task != null)
+                    {
+                        task.Item1(task.Item2);
+                        if (InnerException != null)
+                        {
+                            throw new AggregateException(InnerException);
+                        }
+                    }
+                    else
+                    {
+                        _workItemsWaiting.WaitOne();
+                    }
+                }
+            }
+
+            public override SynchronizationContext CreateCopy()
+            {
+                return this;
+            }
+        }
+    }
+}
diff --git a/Core/obj/Core.csproj.nuget.cache b/Core/obj/Core.csproj.nuget.cache
index 7065053..ab7b764 100644
--- a/Core/obj/Core.csproj.nuget.cache
+++ b/Core/obj/Core.csproj.nuget.cache
@@ -1,5 +1,5 @@
 {
   "version": 1,
-  "dgSpecHash": "jMlS+vAjPG5B7D2lhHQAyXo/t0SQxMYlIjZEHM/1wdRrviXrfEzd9Pgx5nD5J9fbLwGDob3nVvNQCWAjGA2+LA==",
+  "dgSpecHash": "ni+h4mW2edx+EFg4KH0Mp+ym7+P9OvG1mggreTiYLE4kXYEpbQaDt++JEUapSOMlibFYboN1p8YL5vvJDxf61A==",
   "success": true
 }
\ No newline at end of file
diff --git a/Core/obj/Core.csproj.nuget.dgspec.json b/Core/obj/Core.csproj.nuget.dgspec.json
index 89b9784..195fb2d 100644
--- a/Core/obj/Core.csproj.nuget.dgspec.json
+++ b/Core/obj/Core.csproj.nuget.dgspec.json
@@ -1,17 +1,17 @@
 {
   "format": 1,
   "restore": {
-    "/data/fuxi_ci_workspace/63f2dfbecb305611defe8e46/Core/Core.csproj": {}
+    "/data/fuxi_ci_workspace/6438ba837f701874a66183c8/Core/Core.csproj": {}
   },
   "projects": {
-    "/data/fuxi_ci_workspace/63f2dfbecb305611defe8e46/Core/Core.csproj": {
+    "/data/fuxi_ci_workspace/6438ba837f701874a66183c8/Core/Core.csproj": {
       "version": "1.0.0",
       "restore": {
-        "projectUniqueName": "/data/fuxi_ci_workspace/63f2dfbecb305611defe8e46/Core/Core.csproj",
+        "projectUniqueName": "/data/fuxi_ci_workspace/6438ba837f701874a66183c8/Core/Core.csproj",
         "projectName": "G42Cloud.SDK.Core",
-        "projectPath": "/data/fuxi_ci_workspace/63f2dfbecb305611defe8e46/Core/Core.csproj",
+        "projectPath": "/data/fuxi_ci_workspace/6438ba837f701874a66183c8/Core/Core.csproj",
         "packagesPath": "/root/.nuget/packages/",
-        "outputPath": "/data/fuxi_ci_workspace/63f2dfbecb305611defe8e46/Core/obj/",
+        "outputPath": "/data/fuxi_ci_workspace/6438ba837f701874a66183c8/Core/obj/",
         "projectStyle": "PackageReference",
         "fallbackFolders": [
           "/usr/dotnet2/sdk/NuGetFallbackFolder"
@@ -23,7 +23,7 @@
           "netstandard2.0"
         ],
         "sources": {
-          "/data/fuxi_ci_workspace/63f2dfbecb305611defe8e46/package": {}
+          "/data/fuxi_ci_workspace/6438ba837f701874a66183c8/package": {}
         },
         "frameworks": {
           "netstandard2.0": {
diff --git a/Core/obj/Core.csproj.nuget.g.props b/Core/obj/Core.csproj.nuget.g.props
index 8d8e258..f3dd1a3 100644
--- a/Core/obj/Core.csproj.nuget.g.props
+++ b/Core/obj/Core.csproj.nuget.g.props
@@ -3,7 +3,7 @@
   <PropertyGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
     <RestoreSuccess Condition=" '$(RestoreSuccess)' == '' ">True</RestoreSuccess>
     <RestoreTool Condition=" '$(RestoreTool)' == '' ">NuGet</RestoreTool>
-    <ProjectAssetsFile Condition=" '$(ProjectAssetsFile)' == '' ">/data/fuxi_ci_workspace/63f2dfbecb305611defe8e46/Core/obj/project.assets.json</ProjectAssetsFile>
+    <ProjectAssetsFile Condition=" '$(ProjectAssetsFile)' == '' ">/data/fuxi_ci_workspace/6438ba837f701874a66183c8/Core/obj/project.assets.json</ProjectAssetsFile>
     <NuGetPackageRoot Condition=" '$(NuGetPackageRoot)' == '' ">/root/.nuget/packages/</NuGetPackageRoot>
     <NuGetPackageFolders Condition=" '$(NuGetPackageFolders)' == '' ">/root/.nuget/packages/;/usr/dotnet2/sdk/NuGetFallbackFolder</NuGetPackageFolders>
     <NuGetProjectStyle Condition=" '$(NuGetProjectStyle)' == '' ">PackageReference</NuGetProjectStyle>
diff --git a/Core/obj/project.assets.json b/Core/obj/project.assets.json
index 0cc5a51..694455b 100644
--- a/Core/obj/project.assets.json
+++ b/Core/obj/project.assets.json
@@ -1051,11 +1051,11 @@
   "project": {
     "version": "1.0.0",
     "restore": {
-      "projectUniqueName": "/data/fuxi_ci_workspace/63f2dfbecb305611defe8e46/Core/Core.csproj",
+      "projectUniqueName": "/data/fuxi_ci_workspace/6438ba837f701874a66183c8/Core/Core.csproj",
       "projectName": "G42Cloud.SDK.Core",
-      "projectPath": "/data/fuxi_ci_workspace/63f2dfbecb305611defe8e46/Core/Core.csproj",
+      "projectPath": "/data/fuxi_ci_workspace/6438ba837f701874a66183c8/Core/Core.csproj",
       "packagesPath": "/root/.nuget/packages/",
-      "outputPath": "/data/fuxi_ci_workspace/63f2dfbecb305611defe8e46/Core/obj/",
+      "outputPath": "/data/fuxi_ci_workspace/6438ba837f701874a66183c8/Core/obj/",
       "projectStyle": "PackageReference",
       "fallbackFolders": [
         "/usr/dotnet2/sdk/NuGetFallbackFolder"
@@ -1067,7 +1067,7 @@
         "netstandard2.0"
       ],
       "sources": {
-        "/data/fuxi_ci_workspace/63f2dfbecb305611defe8e46/package": {}
+        "/data/fuxi_ci_workspace/6438ba837f701874a66183c8/package": {}
       },
       "frameworks": {
         "netstandard2.0": {
diff --git a/G42Cloud.sln b/G42Cloud.sln
index a90343e..6e17e89 100644
--- a/G42Cloud.sln
+++ b/G42Cloud.sln
@@ -5,27 +5,27 @@ VisualStudioVersion = 15.0.26124.0
 MinimumVisualStudioVersion = 15.0.26124.0
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Core", "Core\Core.csproj", "{863F0212-886F-42E1-89D6-D05075529D8A}"
 EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Services", "Services", "{5BEDE243-F387-4427-8FDE-12B9AEB5DF9C}"
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Services", "Services", "{11A091EC-8F2C-453F-A201-D34916CF05F6}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Cdn", "Services\Cdn\Cdn.csproj", "{456c6dc7-f610-410e-85a1-189ba73f1e43}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Elb", "Services\Elb\Elb.csproj", "{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Cce", "Services\Cce\Cce.csproj", "{a4aaea74-f41e-4c56-b64e-7a2496ff4351}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ims", "Services\Ims\Ims.csproj", "{5B7BFA6B-B85E-4222-8988-16CCF9558393}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ecs", "Services\Ecs\Ecs.csproj", "{c3aaea74-f41e-4c56-b64e-7a2496ff6551}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Evs", "Services\Evs\Evs.csproj", "{B6D999F9-9335-433F-BCD2-1E07409AFA39}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ims", "Services\Ims\Ims.csproj", "{5B7BFA6B-B85E-4222-8988-16CCF9558393}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ecs", "Services\Ecs\Ecs.csproj", "{c3aaea74-f41e-4c56-b64e-7a2496ff6551}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Vpc", "Services\Vpc\Vpc.csproj", "{96f50236-7030-47ab-af32-bb76484fadec}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Smn", "Services\Smn\Smn.csproj", "{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ces", "Services\Ces\Ces.csproj", "{ef66723c-296f-90fe-1bd4-6684bbb02913}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Cbr", "Services\Cbr\Cbr.csproj", "{d5af20cc-1577-e1eb-419c-1d1c08a09995}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Vpc", "Services\Vpc\Vpc.csproj", "{96f50236-7030-47ab-af32-bb76484fadec}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Evs", "Services\Evs\Evs.csproj", "{B6D999F9-9335-433F-BCD2-1E07409AFA39}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Cce", "Services\Cce\Cce.csproj", "{a4aaea74-f41e-4c56-b64e-7a2496ff4351}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ces", "Services\Ces\Ces.csproj", "{ef66723c-296f-90fe-1bd4-6684bbb02913}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Cbr", "Services\Cbr\Cbr.csproj", "{d5af20cc-1577-e1eb-419c-1d1c08a09995}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Elb", "Services\Elb\Elb.csproj", "{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -64,42 +64,18 @@ Global
 		{456c6dc7-f610-410e-85a1-189ba73f1e43}.Release|x64.Build.0 = Release|Any CPU
 		{456c6dc7-f610-410e-85a1-189ba73f1e43}.Release|x86.ActiveCfg = Release|Any CPU
 		{456c6dc7-f610-410e-85a1-189ba73f1e43}.Release|x86.Build.0 = Release|Any CPU
-		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Debug|x64.ActiveCfg = Debug|Any CPU
-		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Debug|x64.Build.0 = Debug|Any CPU
-		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Debug|x86.ActiveCfg = Debug|Any CPU
-		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Debug|x86.Build.0 = Debug|Any CPU
-		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Release|Any CPU.Build.0 = Release|Any CPU
-		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Release|x64.ActiveCfg = Release|Any CPU
-		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Release|x64.Build.0 = Release|Any CPU
-		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Release|x86.ActiveCfg = Release|Any CPU
-		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Release|x86.Build.0 = Release|Any CPU
-		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Debug|x64.ActiveCfg = Debug|Any CPU
-		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Debug|x64.Build.0 = Debug|Any CPU
-		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Debug|x86.ActiveCfg = Debug|Any CPU
-		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Debug|x86.Build.0 = Debug|Any CPU
-		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Release|Any CPU.Build.0 = Release|Any CPU
-		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Release|x64.ActiveCfg = Release|Any CPU
-		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Release|x64.Build.0 = Release|Any CPU
-		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Release|x86.ActiveCfg = Release|Any CPU
-		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Release|x86.Build.0 = Release|Any CPU
-		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Debug|x64.ActiveCfg = Debug|Any CPU
-		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Debug|x64.Build.0 = Debug|Any CPU
-		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Debug|x86.ActiveCfg = Debug|Any CPU
-		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Debug|x86.Build.0 = Debug|Any CPU
-		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Release|Any CPU.Build.0 = Release|Any CPU
-		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Release|x64.ActiveCfg = Release|Any CPU
-		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Release|x64.Build.0 = Release|Any CPU
-		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Release|x86.ActiveCfg = Release|Any CPU
-		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Release|x86.Build.0 = Release|Any CPU
+		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Debug|x64.Build.0 = Debug|Any CPU
+		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Debug|x86.Build.0 = Debug|Any CPU
+		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Release|Any CPU.Build.0 = Release|Any CPU
+		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Release|x64.ActiveCfg = Release|Any CPU
+		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Release|x64.Build.0 = Release|Any CPU
+		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Release|x86.ActiveCfg = Release|Any CPU
+		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Release|x86.Build.0 = Release|Any CPU
 		{c3aaea74-f41e-4c56-b64e-7a2496ff6551}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{c3aaea74-f41e-4c56-b64e-7a2496ff6551}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{c3aaea74-f41e-4c56-b64e-7a2496ff6551}.Debug|x64.ActiveCfg = Debug|Any CPU
@@ -112,30 +88,18 @@ Global
 		{c3aaea74-f41e-4c56-b64e-7a2496ff6551}.Release|x64.Build.0 = Release|Any CPU
 		{c3aaea74-f41e-4c56-b64e-7a2496ff6551}.Release|x86.ActiveCfg = Release|Any CPU
 		{c3aaea74-f41e-4c56-b64e-7a2496ff6551}.Release|x86.Build.0 = Release|Any CPU
-		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Debug|x64.ActiveCfg = Debug|Any CPU
-		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Debug|x64.Build.0 = Debug|Any CPU
-		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Debug|x86.ActiveCfg = Debug|Any CPU
-		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Debug|x86.Build.0 = Debug|Any CPU
-		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Release|Any CPU.Build.0 = Release|Any CPU
-		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Release|x64.ActiveCfg = Release|Any CPU
-		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Release|x64.Build.0 = Release|Any CPU
-		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Release|x86.ActiveCfg = Release|Any CPU
-		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Release|x86.Build.0 = Release|Any CPU
-		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Debug|x64.ActiveCfg = Debug|Any CPU
-		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Debug|x64.Build.0 = Debug|Any CPU
-		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Debug|x86.ActiveCfg = Debug|Any CPU
-		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Debug|x86.Build.0 = Debug|Any CPU
-		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Release|Any CPU.Build.0 = Release|Any CPU
-		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Release|x64.ActiveCfg = Release|Any CPU
-		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Release|x64.Build.0 = Release|Any CPU
-		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Release|x86.ActiveCfg = Release|Any CPU
-		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Release|x86.Build.0 = Release|Any CPU
+		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Debug|x64.Build.0 = Debug|Any CPU
+		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Debug|x86.Build.0 = Debug|Any CPU
+		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Release|Any CPU.Build.0 = Release|Any CPU
+		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Release|x64.ActiveCfg = Release|Any CPU
+		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Release|x64.Build.0 = Release|Any CPU
+		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Release|x86.ActiveCfg = Release|Any CPU
+		{5B7BFA6B-B85E-4222-8988-16CCF9558393}.Release|x86.Build.0 = Release|Any CPU
 		{96f50236-7030-47ab-af32-bb76484fadec}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{96f50236-7030-47ab-af32-bb76484fadec}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{96f50236-7030-47ab-af32-bb76484fadec}.Debug|x64.ActiveCfg = Debug|Any CPU
@@ -148,18 +112,18 @@ Global
 		{96f50236-7030-47ab-af32-bb76484fadec}.Release|x64.Build.0 = Release|Any CPU
 		{96f50236-7030-47ab-af32-bb76484fadec}.Release|x86.ActiveCfg = Release|Any CPU
 		{96f50236-7030-47ab-af32-bb76484fadec}.Release|x86.Build.0 = Release|Any CPU
-		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Debug|x64.ActiveCfg = Debug|Any CPU
-		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Debug|x64.Build.0 = Debug|Any CPU
-		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Debug|x86.ActiveCfg = Debug|Any CPU
-		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Debug|x86.Build.0 = Debug|Any CPU
-		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Release|Any CPU.Build.0 = Release|Any CPU
-		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Release|x64.ActiveCfg = Release|Any CPU
-		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Release|x64.Build.0 = Release|Any CPU
-		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Release|x86.ActiveCfg = Release|Any CPU
-		{a4aaea74-f41e-4c56-b64e-7a2496ff4351}.Release|x86.Build.0 = Release|Any CPU
+		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Debug|x64.Build.0 = Debug|Any CPU
+		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Debug|x86.Build.0 = Debug|Any CPU
+		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Release|Any CPU.Build.0 = Release|Any CPU
+		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Release|x64.ActiveCfg = Release|Any CPU
+		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Release|x64.Build.0 = Release|Any CPU
+		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Release|x86.ActiveCfg = Release|Any CPU
+		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd}.Release|x86.Build.0 = Release|Any CPU
 		{d5af20cc-1577-e1eb-419c-1d1c08a09995}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{d5af20cc-1577-e1eb-419c-1d1c08a09995}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{d5af20cc-1577-e1eb-419c-1d1c08a09995}.Debug|x64.ActiveCfg = Debug|Any CPU
@@ -172,17 +136,53 @@ Global
 		{d5af20cc-1577-e1eb-419c-1d1c08a09995}.Release|x64.Build.0 = Release|Any CPU
 		{d5af20cc-1577-e1eb-419c-1d1c08a09995}.Release|x86.ActiveCfg = Release|Any CPU
 		{d5af20cc-1577-e1eb-419c-1d1c08a09995}.Release|x86.Build.0 = Release|Any CPU
+		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Debug|x64.Build.0 = Debug|Any CPU
+		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Debug|x86.Build.0 = Debug|Any CPU
+		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Release|x64.ActiveCfg = Release|Any CPU
+		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Release|x64.Build.0 = Release|Any CPU
+		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Release|x86.ActiveCfg = Release|Any CPU
+		{B6D999F9-9335-433F-BCD2-1E07409AFA39}.Release|x86.Build.0 = Release|Any CPU
+		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Debug|x64.Build.0 = Debug|Any CPU
+		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Debug|x86.Build.0 = Debug|Any CPU
+		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Release|Any CPU.Build.0 = Release|Any CPU
+		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Release|x64.ActiveCfg = Release|Any CPU
+		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Release|x64.Build.0 = Release|Any CPU
+		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Release|x86.ActiveCfg = Release|Any CPU
+		{ef66723c-296f-90fe-1bd4-6684bbb02913}.Release|x86.Build.0 = Release|Any CPU
+		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Debug|x64.Build.0 = Debug|Any CPU
+		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Debug|x86.Build.0 = Debug|Any CPU
+		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Release|Any CPU.Build.0 = Release|Any CPU
+		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Release|x64.ActiveCfg = Release|Any CPU
+		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Release|x64.Build.0 = Release|Any CPU
+		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Release|x86.ActiveCfg = Release|Any CPU
+		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(NestedProjects) = preSolution
-		{456c6dc7-f610-410e-85a1-189ba73f1e43} = {5BEDE243-F387-4427-8FDE-12B9AEB5DF9C}
-		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb} = {5BEDE243-F387-4427-8FDE-12B9AEB5DF9C}
-		{5B7BFA6B-B85E-4222-8988-16CCF9558393} = {5BEDE243-F387-4427-8FDE-12B9AEB5DF9C}
-		{B6D999F9-9335-433F-BCD2-1E07409AFA39} = {5BEDE243-F387-4427-8FDE-12B9AEB5DF9C}
-		{c3aaea74-f41e-4c56-b64e-7a2496ff6551} = {5BEDE243-F387-4427-8FDE-12B9AEB5DF9C}
-		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd} = {5BEDE243-F387-4427-8FDE-12B9AEB5DF9C}
-		{ef66723c-296f-90fe-1bd4-6684bbb02913} = {5BEDE243-F387-4427-8FDE-12B9AEB5DF9C}
-		{96f50236-7030-47ab-af32-bb76484fadec} = {5BEDE243-F387-4427-8FDE-12B9AEB5DF9C}
-		{a4aaea74-f41e-4c56-b64e-7a2496ff4351} = {5BEDE243-F387-4427-8FDE-12B9AEB5DF9C}
-		{d5af20cc-1577-e1eb-419c-1d1c08a09995} = {5BEDE243-F387-4427-8FDE-12B9AEB5DF9C}
+		{456c6dc7-f610-410e-85a1-189ba73f1e43} = {11A091EC-8F2C-453F-A201-D34916CF05F6}
+		{a4aaea74-f41e-4c56-b64e-7a2496ff4351} = {11A091EC-8F2C-453F-A201-D34916CF05F6}
+		{c3aaea74-f41e-4c56-b64e-7a2496ff6551} = {11A091EC-8F2C-453F-A201-D34916CF05F6}
+		{5B7BFA6B-B85E-4222-8988-16CCF9558393} = {11A091EC-8F2C-453F-A201-D34916CF05F6}
+		{96f50236-7030-47ab-af32-bb76484fadec} = {11A091EC-8F2C-453F-A201-D34916CF05F6}
+		{ced0cfa7-3d43-457f-9f81-f1695a6c65cd} = {11A091EC-8F2C-453F-A201-D34916CF05F6}
+		{d5af20cc-1577-e1eb-419c-1d1c08a09995} = {11A091EC-8F2C-453F-A201-D34916CF05F6}
+		{B6D999F9-9335-433F-BCD2-1E07409AFA39} = {11A091EC-8F2C-453F-A201-D34916CF05F6}
+		{ef66723c-296f-90fe-1bd4-6684bbb02913} = {11A091EC-8F2C-453F-A201-D34916CF05F6}
+		{e15b6d96-3026-44f3-6e15-a7bb7f8f1ebb} = {11A091EC-8F2C-453F-A201-D34916CF05F6}
 	EndGlobalSection
 EndGlobal
diff --git a/README.md b/README.md
index b6a2b3c..d0589e9 100755
--- a/README.md
+++ b/README.md
@@ -18,8 +18,10 @@ This document introduces how to obtain and use G42 Cloud .Net SDK.
   service in [G42 Cloud console](https://console.g42cloud.com/console/) if needed.
 
 - The .NET SDK requires：
-    - **.NET Standard 2.0** or above
-    - **C# 4.0** or above
+  - **.NET and .NET Core 2.0** or above
+  - **.NET Framework 4.6.2** or above
+
+For more version maintenance information, please refer to **Lifecycle FAQ** - [.NET Core](https://learn.microsoft.com/en-us/lifecycle/faq/dotnet-core), [.NET Framework](https://learn.microsoft.com/en-us/lifecycle/faq/dotnet-framework)
 
 ## Install .Net SDK
 
@@ -234,7 +236,7 @@ There are two ways to initialize the {Service}Client, you could choose one you p
 #### 3.1 Initialize the {Service}Client with specified Endpoint [:top:](#user-manual-top)
 
 ``` csharp
-// Specify the endpoint, take the endpoint of VPC service in region of cn-north-4 for example
+// Specify the endpoint, take the endpoint of VPC service in region of ae-ad-1 for example
 String endpoint = "https://vpc.ae-ad-1.g42cloud.com";
 
 // Initialize the credentials, you should provide projectId or domainId in this way, take initializing BasicCredentials for example
@@ -297,21 +299,18 @@ catch (ServiceResponseException serviceResponseException)
 
 ```csharp
 // Initialize asynchronous client instance, take VpcAsyncClient for example
-var vpcClient = VpcAsyncClient.NewBuilder()
+var vpcAsyncClient = VpcAsyncClient.NewBuilder()
     .WithCredential(auth)
     .WithEndPoint(endpoint)
     .WithHttpConfig(config)
     .Build();
 
-// send asynchronous request
-var future = vpcClient.ListVpcsAsync(new ListVpcsRequest()
-{
-    Limit = 1
-});
 
-// get asynchronous response
-var response = future.Result;
-Console.WriteLine(JsonUtils.Serialize(response.Vpcs));
+var request = new ListVpcsRequest();
+
+// Send the request asynchronously and get the response
+var response = await vpcAsyncClient.ListVpcsAsync(request);
+Console.WriteLine(JsonUtils.Serialize(response));
 ```
 
 ### 6. Troubleshooting [:top:](#user-manual-top)
@@ -382,15 +381,152 @@ HttpHandler supports method `AddRequestHandler` and `AddResponseHandler`.
 
 ### 7. FAQ [:top:](#user-manual-top)
 
-Use .Net Framework 4.7 to integrate .Net SDK, a dead lock occurs
+1 Using .NET Framework 4.7 to integrate .NET SDK, an exception throws - ProtocolViolationException: Cannot send a content-body with this verb-type
+
+**[Cause]**: .NET Framework does not support generating GET requests with content-body.
+
+**[Solution]**: Configuration parameter `IgnoreBodyForGetRequest` makes GET request without content-body, as follows:
+
+```c#
+var httpConfig = HttpConfig.GetDefaultConfig();
+httpConfig.IgnoreBodyForGetRequest = true;
+
+var client = VpcClient.NewBuilder()
+    .WithCredential(auth)
+    .WithHttpConfig(httpConfig)
+    .WithRegion(VpcRegion.ValueOf("ae-ad-1"))
+    .Build();
+```
+
+2 Use .NET Framework 4.7 to integrate .NET SDK, a dead lock occurs
 
 **[Symptom]**: When using synchronized client to call an interface, and the program has been started, but where is no
 error message or timeout occurs.
 
 **[Cause]**: The inner implementation of sending requests in synchronized client of SDK is to use an asynchronous task,
-and SDK will await this task. In such scenario, **deadlock** occurs between the context of the .Net Framework UI and the
+and SDK will await this task. In such scenario, **deadlock** occurs between the context of the .NET Framework UI and the
 asynchronous task context of the SDK. As a result, the asynchronous task of the SDK cannot be
 activated. [Original article](https://blog.stephencleary.com/2012/07/dont-block-on-async-code.html)
 
 **[Solution]**: **Switch the synchronous client to the asynchronous client**. If the UI events and API requests are both
-asynchronous, there will be no deadlock.
+asynchronous, there will be no deadlock. The following are examples of MVC and WPF solutions:
+
+MVC
+
+```c#
+using System;
+using System.Threading.Tasks;
+using System.Web.Mvc;
+using G42Cloud.SDK.Core.Auth;
+using G42Cloud.SDK.Core;
+using G42Cloud.SDK.Vpc.V2;
+using G42Cloud.SDK.Vpc.V2.Model;
+
+namespace WebApplication1.Controllers
+{
+    public class HomeController : Controller
+    {
+        private readonly VpcAsyncClient _vpcAsyncClient = InitAsyncClient();
+
+        private static VpcAsyncClient InitAsyncClient()
+        {
+            const string ak = "{your ak string}";
+            const string sk = "{your sk string}";
+
+            var auth = new BasicCredentials(ak, sk);
+			
+            // Use asynchronous client
+            var client = VpcAsyncClient.NewBuilder()
+                    .WithCredential(auth)
+                    .WithRegion(VpcRegion.ValueOf("ae-ad-1"))
+                    .Build();
+            return client;
+        }
+
+        private async Task<ListVpcsResponse> ListVpcsAsync()
+        {
+            var req = new ListVpcsRequest();
+            
+            // Send the request asynchronously, using await will not block the thread
+            var resp = await _vpcAsyncClient.ListVpcsAsync(req);
+            Console.WriteLine(resp.GetHttpStatusCode());
+            return resp;
+        }
+
+        public ActionResult Index()
+        {
+            return View();
+        }
+        
+        // Replace synchronous methods with asynchronous methods
+        public async Task<ActionResult> About()
+        {
+            var resp = await ListVpcsAsync();
+            var respString = JsonUtils.Serialize(resp);
+
+            ViewBag.Message = respString;
+            return View();
+        }
+    }
+}
+```
+
+WPF
+
+```c#
+using System;
+using System.Threading.Tasks;
+using System.Windows;
+using G42Cloud.SDK.Core;
+using G42Cloud.SDK.Core.Auth;
+using G42Cloud.SDK.Vpc.V2;
+using G42Cloud.SDK.Vpc.V2.Model;
+
+namespace WpfApp1
+{
+    public partial class MainWindow : Window
+    {
+
+        private readonly VpcAsyncClient _asyncClient = InitAsyncClient();
+
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+
+        private static VpcAsyncClient InitAsyncClient()
+        {
+            const string ak = "{your ak string}";
+            const string sk = "{your sk string}";
+
+            var auth = new BasicCredentials(ak, sk);
+
+            // Use asynchronous client
+            var client = VpcAsyncClient.NewBuilder()
+                .WithCredential(auth)
+                .WithRegion(VpcRegion.ValueOf("ae-ad-1"))
+                .Build();
+
+            return client;
+        }
+
+        private async Task<ListVpcsResponse> ListVpcs()
+        {
+            var req = new ListVpcsRequest();
+
+            // Send the request asynchronously, using await will not block the thread
+            var resp = await _asyncClient.ListVpcsAsync(req);
+            Console.WriteLine(resp.GetHttpStatusCode());
+            return resp;
+        }
+
+        // Replace synchronous methods with asynchronous methods
+        private async void ButtonBase_OnClick(object sender, RoutedEventArgs e)
+        {
+            var resp = await ListVpcs();
+            var respString = JsonUtils.Serialize(resp);
+            MessageBox.Show(respString);
+        }
+    }
+}
+```
diff --git a/Services/Cbr/Cbr.csproj b/Services/Cbr/Cbr.csproj
index 9390f37..93753db 100755
--- a/Services/Cbr/Cbr.csproj
+++ b/Services/Cbr/Cbr.csproj
@@ -15,7 +15,7 @@
         <GenerateAssemblyDescriptionAttribute>false</GenerateAssemblyDescriptionAttribute>
         <GenerateAssemblyInformationalVersionAttribute>false</GenerateAssemblyInformationalVersionAttribute>
         <PackageId>G42Cloud.SDK.Cbr</PackageId>
-        <Version>0.0.4-beta</Version>
+        <Version>0.0.5-beta</Version>
         <Authors>G42Cloud</Authors>
         <Copyright>Copyright 2020 G42 Technologies Co., Ltd.</Copyright>
         <Company>G42 Technologies Co., Ltd.</Company>
diff --git a/Services/Cbr/V1/CbrAsyncClient.cs b/Services/Cbr/V1/CbrAsyncClient.cs
index 4672042..f8bc4dc 100755
--- a/Services/Cbr/V1/CbrAsyncClient.cs
+++ b/Services/Cbr/V1/CbrAsyncClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using System.Threading.Tasks;
diff --git a/Services/Cbr/V1/CbrClient.cs b/Services/Cbr/V1/CbrClient.cs
index 33d25b9..70e483e 100755
--- a/Services/Cbr/V1/CbrClient.cs
+++ b/Services/Cbr/V1/CbrClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using G42Cloud.SDK.Core;
diff --git a/Services/Cce/Cce.csproj b/Services/Cce/Cce.csproj
index 980bb73..b066375 100755
--- a/Services/Cce/Cce.csproj
+++ b/Services/Cce/Cce.csproj
@@ -15,7 +15,7 @@
         <GenerateAssemblyDescriptionAttribute>false</GenerateAssemblyDescriptionAttribute>
         <GenerateAssemblyInformationalVersionAttribute>false</GenerateAssemblyInformationalVersionAttribute>
         <PackageId>G42Cloud.SDK.Cce</PackageId>
-        <Version>0.0.4-beta</Version>
+        <Version>0.0.5-beta</Version>
         <Authors>G42Cloud</Authors>
         <Copyright>Copyright 2020 G42 Technologies Co., Ltd.</Copyright>
         <Company>G42 Technologies Co., Ltd.</Company>
diff --git a/Services/Cce/V3/CceAsyncClient.cs b/Services/Cce/V3/CceAsyncClient.cs
index 73345c5..a3d794c 100755
--- a/Services/Cce/V3/CceAsyncClient.cs
+++ b/Services/Cce/V3/CceAsyncClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using System.Threading.Tasks;
diff --git a/Services/Cce/V3/CceClient.cs b/Services/Cce/V3/CceClient.cs
index 88ff202..08af844 100755
--- a/Services/Cce/V3/CceClient.cs
+++ b/Services/Cce/V3/CceClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using G42Cloud.SDK.Core;
diff --git a/Services/Cdn/Cdn.csproj b/Services/Cdn/Cdn.csproj
index eff90ba..465ac97 100755
--- a/Services/Cdn/Cdn.csproj
+++ b/Services/Cdn/Cdn.csproj
@@ -15,7 +15,7 @@
         <GenerateAssemblyDescriptionAttribute>false</GenerateAssemblyDescriptionAttribute>
         <GenerateAssemblyInformationalVersionAttribute>false</GenerateAssemblyInformationalVersionAttribute>
         <PackageId>G42Cloud.SDK.Cdn</PackageId>
-        <Version>0.0.4-beta</Version>
+        <Version>0.0.5-beta</Version>
         <Authors>G42Cloud</Authors>
         <Copyright>Copyright 2020 G42 Technologies Co., Ltd.</Copyright>
         <Company>G42 Technologies Co., Ltd.</Company>
diff --git a/Services/Cdn/V1/CdnAsyncClient.cs b/Services/Cdn/V1/CdnAsyncClient.cs
index 9340a14..e4a83b8 100755
--- a/Services/Cdn/V1/CdnAsyncClient.cs
+++ b/Services/Cdn/V1/CdnAsyncClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using System.Threading.Tasks;
diff --git a/Services/Cdn/V1/CdnClient.cs b/Services/Cdn/V1/CdnClient.cs
index d609c2d..eb37bd0 100755
--- a/Services/Cdn/V1/CdnClient.cs
+++ b/Services/Cdn/V1/CdnClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using G42Cloud.SDK.Core;
diff --git a/Services/Cdn/V2/CdnAsyncClient.cs b/Services/Cdn/V2/CdnAsyncClient.cs
index 07f28d9..7e2c4c7 100755
--- a/Services/Cdn/V2/CdnAsyncClient.cs
+++ b/Services/Cdn/V2/CdnAsyncClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using System.Threading.Tasks;
diff --git a/Services/Cdn/V2/CdnClient.cs b/Services/Cdn/V2/CdnClient.cs
index 7ed82eb..07c7066 100755
--- a/Services/Cdn/V2/CdnClient.cs
+++ b/Services/Cdn/V2/CdnClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using G42Cloud.SDK.Core;
diff --git a/Services/Ces/Ces.csproj b/Services/Ces/Ces.csproj
index 6c3dad5..6819cf3 100755
--- a/Services/Ces/Ces.csproj
+++ b/Services/Ces/Ces.csproj
@@ -15,7 +15,7 @@
         <GenerateAssemblyDescriptionAttribute>false</GenerateAssemblyDescriptionAttribute>
         <GenerateAssemblyInformationalVersionAttribute>false</GenerateAssemblyInformationalVersionAttribute>
         <PackageId>G42Cloud.SDK.Ces</PackageId>
-        <Version>0.0.4-beta</Version>
+        <Version>0.0.5-beta</Version>
         <Authors>G42Cloud</Authors>
         <Copyright>Copyright 2020 G42 Technologies Co., Ltd.</Copyright>
         <Company>G42 Technologies Co., Ltd.</Company>
diff --git a/Services/Ces/V1/CesAsyncClient.cs b/Services/Ces/V1/CesAsyncClient.cs
index 9ce85d3..037a428 100755
--- a/Services/Ces/V1/CesAsyncClient.cs
+++ b/Services/Ces/V1/CesAsyncClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using System.Threading.Tasks;
diff --git a/Services/Ces/V1/CesClient.cs b/Services/Ces/V1/CesClient.cs
index 5dcb917..b44c657 100755
--- a/Services/Ces/V1/CesClient.cs
+++ b/Services/Ces/V1/CesClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using G42Cloud.SDK.Core;
diff --git a/Services/Ces/V2/CesAsyncClient.cs b/Services/Ces/V2/CesAsyncClient.cs
index 4217e1c..6cad5ab 100755
--- a/Services/Ces/V2/CesAsyncClient.cs
+++ b/Services/Ces/V2/CesAsyncClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using System.Threading.Tasks;
diff --git a/Services/Ces/V2/CesClient.cs b/Services/Ces/V2/CesClient.cs
index 610b9a9..6c25044 100755
--- a/Services/Ces/V2/CesClient.cs
+++ b/Services/Ces/V2/CesClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using G42Cloud.SDK.Core;
diff --git a/Services/Ecs/Ecs.csproj b/Services/Ecs/Ecs.csproj
index 9a5bdb2..2d6f308 100755
--- a/Services/Ecs/Ecs.csproj
+++ b/Services/Ecs/Ecs.csproj
@@ -15,7 +15,7 @@
         <GenerateAssemblyDescriptionAttribute>false</GenerateAssemblyDescriptionAttribute>
         <GenerateAssemblyInformationalVersionAttribute>false</GenerateAssemblyInformationalVersionAttribute>
         <PackageId>G42Cloud.SDK.Ecs</PackageId>
-        <Version>0.0.4-beta</Version>
+        <Version>0.0.5-beta</Version>
         <Authors>G42Cloud</Authors>
         <Copyright>Copyright 2020 G42 Technologies Co., Ltd.</Copyright>
         <Company>G42 Technologies Co., Ltd.</Company>
diff --git a/Services/Ecs/V2/EcsAsyncClient.cs b/Services/Ecs/V2/EcsAsyncClient.cs
index a19a461..7e25bbe 100755
--- a/Services/Ecs/V2/EcsAsyncClient.cs
+++ b/Services/Ecs/V2/EcsAsyncClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using System.Threading.Tasks;
diff --git a/Services/Ecs/V2/EcsClient.cs b/Services/Ecs/V2/EcsClient.cs
index b681988..b4306cd 100755
--- a/Services/Ecs/V2/EcsClient.cs
+++ b/Services/Ecs/V2/EcsClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using G42Cloud.SDK.Core;
diff --git a/Services/Elb/Elb.csproj b/Services/Elb/Elb.csproj
index b24fa64..c7bce52 100755
--- a/Services/Elb/Elb.csproj
+++ b/Services/Elb/Elb.csproj
@@ -15,7 +15,7 @@
         <GenerateAssemblyDescriptionAttribute>false</GenerateAssemblyDescriptionAttribute>
         <GenerateAssemblyInformationalVersionAttribute>false</GenerateAssemblyInformationalVersionAttribute>
         <PackageId>G42Cloud.SDK.Elb</PackageId>
-        <Version>0.0.4-beta</Version>
+        <Version>0.0.5-beta</Version>
         <Authors>G42Cloud</Authors>
         <Copyright>Copyright 2020 G42 Technologies Co., Ltd.</Copyright>
         <Company>G42 Technologies Co., Ltd.</Company>
diff --git a/Services/Elb/V3/ElbAsyncClient.cs b/Services/Elb/V3/ElbAsyncClient.cs
index 5965c6c..5c175ac 100755
--- a/Services/Elb/V3/ElbAsyncClient.cs
+++ b/Services/Elb/V3/ElbAsyncClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using System.Threading.Tasks;
diff --git a/Services/Elb/V3/ElbClient.cs b/Services/Elb/V3/ElbClient.cs
index 29098a5..34ef232 100755
--- a/Services/Elb/V3/ElbClient.cs
+++ b/Services/Elb/V3/ElbClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using G42Cloud.SDK.Core;
diff --git a/Services/Evs/Evs.csproj b/Services/Evs/Evs.csproj
index 31cc399..dbc8daf 100755
--- a/Services/Evs/Evs.csproj
+++ b/Services/Evs/Evs.csproj
@@ -15,7 +15,7 @@
         <GenerateAssemblyDescriptionAttribute>false</GenerateAssemblyDescriptionAttribute>
         <GenerateAssemblyInformationalVersionAttribute>false</GenerateAssemblyInformationalVersionAttribute>
         <PackageId>G42Cloud.SDK.Evs</PackageId>
-        <Version>0.0.4-beta</Version>
+        <Version>0.0.5-beta</Version>
         <Authors>G42Cloud</Authors>
         <Copyright>Copyright 2020 G42 Technologies Co., Ltd.</Copyright>
         <Company>G42 Technologies Co., Ltd.</Company>
diff --git a/Services/Evs/V2/EvsAsyncClient.cs b/Services/Evs/V2/EvsAsyncClient.cs
index e1f46f4..88b7057 100755
--- a/Services/Evs/V2/EvsAsyncClient.cs
+++ b/Services/Evs/V2/EvsAsyncClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using System.Threading.Tasks;
diff --git a/Services/Evs/V2/EvsClient.cs b/Services/Evs/V2/EvsClient.cs
index 1b77e2d..7bbdd60 100755
--- a/Services/Evs/V2/EvsClient.cs
+++ b/Services/Evs/V2/EvsClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using G42Cloud.SDK.Core;
diff --git a/Services/Ims/Ims.csproj b/Services/Ims/Ims.csproj
index 9f04356..00db1a2 100755
--- a/Services/Ims/Ims.csproj
+++ b/Services/Ims/Ims.csproj
@@ -15,7 +15,7 @@
         <GenerateAssemblyDescriptionAttribute>false</GenerateAssemblyDescriptionAttribute>
         <GenerateAssemblyInformationalVersionAttribute>false</GenerateAssemblyInformationalVersionAttribute>
         <PackageId>G42Cloud.SDK.Ims</PackageId>
-        <Version>0.0.4-beta</Version>
+        <Version>0.0.5-beta</Version>
         <Authors>G42Cloud</Authors>
         <Copyright>Copyright 2020 G42 Technologies Co., Ltd.</Copyright>
         <Company>G42 Technologies Co., Ltd.</Company>
diff --git a/Services/Ims/V2/ImsAsyncClient.cs b/Services/Ims/V2/ImsAsyncClient.cs
index a3a0e01..8f692f3 100755
--- a/Services/Ims/V2/ImsAsyncClient.cs
+++ b/Services/Ims/V2/ImsAsyncClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using System.Threading.Tasks;
diff --git a/Services/Ims/V2/ImsClient.cs b/Services/Ims/V2/ImsClient.cs
index 98e3edd..95df5fd 100755
--- a/Services/Ims/V2/ImsClient.cs
+++ b/Services/Ims/V2/ImsClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using G42Cloud.SDK.Core;
diff --git a/Services/Smn/Smn.csproj b/Services/Smn/Smn.csproj
index 41428a2..004d1c6 100755
--- a/Services/Smn/Smn.csproj
+++ b/Services/Smn/Smn.csproj
@@ -15,7 +15,7 @@
         <GenerateAssemblyDescriptionAttribute>false</GenerateAssemblyDescriptionAttribute>
         <GenerateAssemblyInformationalVersionAttribute>false</GenerateAssemblyInformationalVersionAttribute>
         <PackageId>G42Cloud.SDK.Smn</PackageId>
-        <Version>0.0.4-beta</Version>
+        <Version>0.0.5-beta</Version>
         <Authors>G42Cloud</Authors>
         <Copyright>Copyright 2020 G42 Technologies Co., Ltd.</Copyright>
         <Company>G42 Technologies Co., Ltd.</Company>
diff --git a/Services/Smn/V2/SmnAsyncClient.cs b/Services/Smn/V2/SmnAsyncClient.cs
index 4e470f0..2cebe58 100755
--- a/Services/Smn/V2/SmnAsyncClient.cs
+++ b/Services/Smn/V2/SmnAsyncClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using System.Threading.Tasks;
diff --git a/Services/Smn/V2/SmnClient.cs b/Services/Smn/V2/SmnClient.cs
index df77866..46d65cc 100755
--- a/Services/Smn/V2/SmnClient.cs
+++ b/Services/Smn/V2/SmnClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using G42Cloud.SDK.Core;
diff --git a/Services/Vpc/V2/VpcAsyncClient.cs b/Services/Vpc/V2/VpcAsyncClient.cs
index 3e01e92..f13608b 100755
--- a/Services/Vpc/V2/VpcAsyncClient.cs
+++ b/Services/Vpc/V2/VpcAsyncClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using System.Threading.Tasks;
diff --git a/Services/Vpc/V2/VpcClient.cs b/Services/Vpc/V2/VpcClient.cs
index 698397f..e325067 100755
--- a/Services/Vpc/V2/VpcClient.cs
+++ b/Services/Vpc/V2/VpcClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using G42Cloud.SDK.Core;
diff --git a/Services/Vpc/V3/VpcAsyncClient.cs b/Services/Vpc/V3/VpcAsyncClient.cs
index 2ae4105..efa17a4 100755
--- a/Services/Vpc/V3/VpcAsyncClient.cs
+++ b/Services/Vpc/V3/VpcAsyncClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using System.Threading.Tasks;
diff --git a/Services/Vpc/V3/VpcClient.cs b/Services/Vpc/V3/VpcClient.cs
index 3e3c172..028f2f4 100755
--- a/Services/Vpc/V3/VpcClient.cs
+++ b/Services/Vpc/V3/VpcClient.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Collections.Generic;
 using G42Cloud.SDK.Core;
diff --git a/Services/Vpc/Vpc.csproj b/Services/Vpc/Vpc.csproj
index 482d67b..c81e80f 100755
--- a/Services/Vpc/Vpc.csproj
+++ b/Services/Vpc/Vpc.csproj
@@ -15,7 +15,7 @@
         <GenerateAssemblyDescriptionAttribute>false</GenerateAssemblyDescriptionAttribute>
         <GenerateAssemblyInformationalVersionAttribute>false</GenerateAssemblyInformationalVersionAttribute>
         <PackageId>G42Cloud.SDK.Vpc</PackageId>
-        <Version>0.0.4-beta</Version>
+        <Version>0.0.5-beta</Version>
         <Authors>G42Cloud</Authors>
         <Copyright>Copyright 2020 G42 Technologies Co., Ltd.</Copyright>
         <Company>G42 Technologies Co., Ltd.</Company>