diff --git a/websocket-sharp/Ext.cs b/websocket-sharp/Ext.cs
index 5d6452f4..1203e40b 100644
--- a/websocket-sharp/Ext.cs
+++ b/websocket-sharp/Ext.cs
@@ -906,6 +906,12 @@ namespace WebSocketSharp
       return BitConverter.ToUInt64 (source.ToHostOrder (sourceOrder), 0);
     }
 
+    internal static IEnumerable<string> Trim (this IEnumerable<string> source)
+    {
+      foreach (var elm in source)
+        yield return elm.Trim ();
+    }
+
     internal static string TrimSlashFromEnd (this string value)
     {
       var ret = value.TrimEnd ('/');