diff --git a/src/main/SimpleHttpListener.Rx/Model/Base/HttpHeaderBase.cs b/src/main/SimpleHttpListener.Rx/Model/Base/HttpHeaderBase.cs
index 2321f81..fe97d50 100644
--- a/src/main/SimpleHttpListener.Rx/Model/Base/HttpHeaderBase.cs
+++ b/src/main/SimpleHttpListener.Rx/Model/Base/HttpHeaderBase.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Net.Sockets;
 using ISimpleHttpListener.Rx.Model;
@@ -7,7 +8,7 @@ namespace SimpleHttpListener.Rx.Model.Base
 {
     public abstract class HttpHeaderBase : ParseControlBase, IHttpHeaders
     {
-        public IDictionary<string, string> Headers { get; set; } = new Dictionary<string, string>();
+        public IDictionary<string, string> Headers { get; set; } = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
 
         public Stream ResponseStream { get; set; }