From 0816ad97c559fcaa85d7f12aa187aa4b25bfdd21 Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Mon, 1 Nov 2021 20:46:19 +0900
Subject: [PATCH] [Modify] Add it

---
 websocket-sharp/Server/WebSocketBehavior.cs | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/websocket-sharp/Server/WebSocketBehavior.cs b/websocket-sharp/Server/WebSocketBehavior.cs
index 49292c2a..6e47872e 100644
--- a/websocket-sharp/Server/WebSocketBehavior.cs
+++ b/websocket-sharp/Server/WebSocketBehavior.cs
@@ -833,6 +833,27 @@ namespace WebSocketSharp.Server
     {
     }
 
+    /// <summary>
+    /// Sends a ping to a client using the WebSocket connection.
+    /// </summary>
+    /// <returns>
+    /// <c>true</c> if the send has done with no error and a pong has been
+    /// received within a time; otherwise, <c>false</c>.
+    /// </returns>
+    /// <exception cref="InvalidOperationException">
+    /// The session has not started yet.
+    /// </exception>
+    protected bool Ping ()
+    {
+      if (_websocket == null) {
+        var msg = "The session has not started yet.";
+
+        throw new InvalidOperationException (msg);
+      }
+
+      return _websocket.Ping ();
+    }
+
     /// <summary>
     /// Sends the specified data to a client using the WebSocket connection.
     /// </summary>