From 73a0b51c09b97b8ff68c09cda1f8525b2cca2023 Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Wed, 18 Oct 2017 15:05:18 +0900
Subject: [PATCH] [Modify] Throw exception

---
 websocket-sharp/Server/HttpServer.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/websocket-sharp/Server/HttpServer.cs b/websocket-sharp/Server/HttpServer.cs
index 270b859a..c101b609 100644
--- a/websocket-sharp/Server/HttpServer.cs
+++ b/websocket-sharp/Server/HttpServer.cs
@@ -630,6 +630,11 @@ namespace WebSocketSharp.Server
     /// </value>
     public ServerSslConfiguration SslConfiguration {
       get {
+        if (!_secure) {
+          var msg = "This instance does not provide secure connections.";
+          throw new InvalidOperationException (msg);
+        }
+
         return _listener.SslConfiguration;
       }
     }