From 74bb695fa058319dd5eb71595b1075cd1b7014c3 Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Tue, 25 Sep 2018 19:37:32 +0900
Subject: [PATCH] [Modify] Throw exception

---
 websocket-sharp/Net/HttpUtility.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/websocket-sharp/Net/HttpUtility.cs b/websocket-sharp/Net/HttpUtility.cs
index 89533173..7a5de1c7 100644
--- a/websocket-sharp/Net/HttpUtility.cs
+++ b/websocket-sharp/Net/HttpUtility.cs
@@ -1269,7 +1269,7 @@ namespace WebSocketSharp.Net
     public static byte[] UrlEncodeToBytes (string s, Encoding encoding)
     {
       if (s == null)
-        return null;
+        throw new ArgumentNullException ("s");
 
       if (s.Length == 0)
         return new byte[0];