From 32efdc25c3630b0173743762e3945fde2dc6d9b0 Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Fri, 13 Mar 2020 22:23:51 +0900
Subject: [PATCH] [Modify] Polish it

---
 websocket-sharp/Net/WebHeaderCollection.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/websocket-sharp/Net/WebHeaderCollection.cs b/websocket-sharp/Net/WebHeaderCollection.cs
index bf681d1a..894a1cc1 100644
--- a/websocket-sharp/Net/WebHeaderCollection.cs
+++ b/websocket-sharp/Net/WebHeaderCollection.cs
@@ -811,7 +811,10 @@ namespace WebSocketSharp.Net
 
     private void checkRestricted (string name)
     {
-      if (!_internallyUsed && isRestricted (name, true))
+      if (_internallyUsed)
+        return;
+
+      if (isRestricted (name, true))
         throw new ArgumentException ("This header must be modified with the appropiate property.");
     }