From 68036554dbb158b1dde1c55d1f2c0fab75e6dbbe Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Wed, 20 May 2020 19:45:20 +0900
Subject: [PATCH] [Modify] Add it

---
 websocket-sharp/Net/WebHeaderCollection.cs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/websocket-sharp/Net/WebHeaderCollection.cs b/websocket-sharp/Net/WebHeaderCollection.cs
index 3520c0f3..716cd89e 100644
--- a/websocket-sharp/Net/WebHeaderCollection.cs
+++ b/websocket-sharp/Net/WebHeaderCollection.cs
@@ -849,6 +849,18 @@ namespace WebSocketSharp.Net
       }
     }
 
+    private void checkRestricted (string name, bool response)
+    {
+      if (_internallyUsed)
+        return;
+
+      if (isRestricted (name, response)) {
+        var msg = "The header is a restricted header.";
+
+        throw new ArgumentException (msg);
+      }
+    }
+
     private void checkState (bool response)
     {
       if (_state == HttpHeaderType.Unspecified)