diff --git a/websocket-sharp/Net/HttpListener.cs b/websocket-sharp/Net/HttpListener.cs
index a5a7448f..e6edc673 100644
--- a/websocket-sharp/Net/HttpListener.cs
+++ b/websocket-sharp/Net/HttpListener.cs
@@ -71,6 +71,7 @@ namespace WebSocketSharp.Net
     private Dictionary<HttpListenerContext, HttpListenerContext> _ctxRegistry;
     private object                                               _ctxRegistrySync;
     private Func<IIdentity, NetworkCredential>                   _credFinder;
+    private static readonly string                               _defaultRealm;
     private bool                                                 _disposed;
     private bool                                                 _ignoreWriteExceptions;
     private volatile bool                                        _listening;
@@ -84,6 +85,15 @@ namespace WebSocketSharp.Net
 
     #endregion
 
+    #region Static Constructor
+
+    static HttpListener ()
+    {
+      _defaultRealm = "SECRET AREA";
+    }
+
+    #endregion
+
     #region Public Constructors
 
     /// <summary>
@@ -552,6 +562,12 @@ namespace WebSocketSharp.Net
         throw new ObjectDisposedException (GetType ().ToString ());
     }
 
+    internal string GetRealm ()
+    {
+      var realm = _realm;
+      return realm != null && realm.Length > 0 ? realm : _defaultRealm;
+    }
+
     internal bool RegisterContext (HttpListenerContext context)
     {
       if (!_listening)