diff -Nur HttpServer-/HttpClientContext.cs HttpServer/HttpClientContext.cs
--- HttpServer-/HttpClientContext.cs	2013-02-01 18:39:44.868009882 +0900
+++ HttpServer/HttpClientContext.cs	2013-02-01 18:45:07.740259535 +0900
@@ -6,6 +6,9 @@
 using HttpServer.Exceptions;
 using HttpServer.Parser;
 
+using System.Net.Security;
+using System.Security.Cryptography.X509Certificates;
+
 namespace HttpServer
 {
     /// <summary>
@@ -77,6 +80,18 @@
            
             _buffer = new byte[bufferSize];
 
+            // by Fumi.Iseki
+            SSLCommonName = "";
+            if (secured)
+            {
+                SslStream _ssl = (SslStream)_stream;
+                X509Certificate _cert1 = _ssl.RemoteCertificate;
+                if (_cert1 != null)
+                {
+                    X509Certificate2 _cert2 = new X509Certificate2(_cert1);
+                    if (_cert2 != null) SSLCommonName = _cert2.GetNameInfo(X509NameType.SimpleName, false);
+                }
+            }
         }
 
         public bool EndWhenDone
@@ -185,6 +200,11 @@
         /// </summary>
         public bool IsSecured { get; internal set; }
 
+        //
+        //
+        // by Fumi.Iseki
+        public string SSLCommonName { get; internal set; }
+
         /// <summary>
         /// Specify which logger to use.
         /// </summary>
diff -Nur HttpServer-/HttpContextFactory.cs HttpServer/HttpContextFactory.cs
--- HttpServer-/HttpContextFactory.cs	2013-02-01 18:39:44.868009882 +0900
+++ HttpServer/HttpContextFactory.cs	2013-02-01 18:44:42.408133328 +0900
@@ -19,6 +19,10 @@
         private readonly IRequestParserFactory _factory;
         private readonly ILogWriter _logWriter;
 
+        // by Fumi.Iseki
+        public  static RemoteCertificateValidationCallback ClientCertificateValidationCallback = null;
+        private RemoteCertificateValidationCallback _clientCallback = null;
+
         /// <summary>
         /// Initializes a new instance of the <see cref="HttpContextFactory"/> class.
         /// </summary>
@@ -30,6 +34,13 @@
             _logWriter = writer;
             _bufferSize = bufferSize;
             _factory = factory;
+
+            // by Fumi.Iseki
+            if (ClientCertificateValidationCallback != null)
+            {
+                _clientCallback = ClientCertificateValidationCallback;
+                ClientCertificateValidationCallback = null;
+            }
         }
 
         ///<summary>
@@ -127,11 +138,19 @@
 			var networkStream = new ReusableSocketNetworkStream(socket, true);
             var remoteEndPoint = (IPEndPoint) socket.RemoteEndPoint;
 
-            var sslStream = new SslStream(networkStream, false);
+            // by Fumi.Iseki
+            var sslStream = new SslStream(networkStream, false, new RemoteCertificateValidationCallback(_clientCallback));
             try
             {
                 //TODO: this may fail
-                sslStream.AuthenticateAsServer(certificate, false, protocol, false);
+                if (_clientCallback == null)    // by Fumi.Iseki
+                {
+                    sslStream.AuthenticateAsServer(certificate, false, protocol, false);
+                }
+                else
+                {
+                    sslStream.AuthenticateAsServer(certificate, true, protocol, false);
+                }
                 return CreateContext(true, remoteEndPoint, sslStream, socket);
             }
             catch (IOException err)
diff -Nur HttpServer-/IHttpClientContext.cs HttpServer/IHttpClientContext.cs
--- HttpServer-/IHttpClientContext.cs	2013-02-01 18:39:44.872009815 +0900
+++ HttpServer/IHttpClientContext.cs	2013-02-01 18:44:05.196259567 +0900
@@ -9,6 +9,11 @@
     /// </summary>
     public interface IHttpClientContext
     {
+        //
+        //
+        // by Fumi.Iseki
+        string SSLCommonName { get; }
+
         /// <summary>
         /// Using SSL or other encryption method.
         /// </summary>