From e03538bdc89066a3831a45e862f45dab790b62f5 Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Wed, 20 Dec 2017 16:13:02 +0900
Subject: [PATCH] [Modify] Add it

---
 websocket-sharp/Ext.cs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/websocket-sharp/Ext.cs b/websocket-sharp/Ext.cs
index 9b0d7594..b768d523 100644
--- a/websocket-sharp/Ext.cs
+++ b/websocket-sharp/Ext.cs
@@ -1022,6 +1022,15 @@ namespace WebSocketSharp
                : value.Substring (start + 1, len).Replace ("\\\"", "\"");
     }
 
+    internal static bool Upgrades (
+      this NameValueCollection headers, string protocol
+    )
+    {
+      var comparison = StringComparison.OrdinalIgnoreCase;
+      return headers.Contains ("Upgrade", protocol, comparison)
+             && headers.Contains ("Connection", "Upgrade", comparison);
+    }
+
     internal static string UTF8Decode (this byte[] bytes)
     {
       try {