From 01cb3565a643adf0d2d9f3324710b8a541f9e19e Mon Sep 17 00:00:00 2001
From: Vivek Rathod <vrathod@trustwave.com>
Date: Thu, 13 Aug 2020 17:07:19 -0400
Subject: [PATCH] In closeHandshake do not mask the payload when receiving.
 Fixes https://github.com/sta/websocket-sharp/issues/360

---
 websocket-sharp/WebSocket.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/websocket-sharp/WebSocket.cs b/websocket-sharp/WebSocket.cs
index 011dee00d..5adb77533 100644
--- a/websocket-sharp/WebSocket.cs
+++ b/websocket-sharp/WebSocket.cs
@@ -1201,10 +1201,10 @@ private bool closeHandshake (
     {
       var sent = false;
       if (send) {
-        var frame = WebSocketFrame.CreateCloseFrame (payloadData, _client);
+        var frame = WebSocketFrame.CreateCloseFrame (payloadData, _client && !received);
         sent = sendBytes (frame.ToArray ());
 
-        if (_client)
+        if (_client && !received)
           frame.Unmask ();
       }