From aac634848ef2df9582679ebb995f692011e7de32 Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Sat, 3 Jun 2017 16:22:20 +0900
Subject: [PATCH] [Modify] It throws exception

---
 websocket-sharp/Server/HttpServer.cs | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/websocket-sharp/Server/HttpServer.cs b/websocket-sharp/Server/HttpServer.cs
index f2850621..d329b5d8 100644
--- a/websocket-sharp/Server/HttpServer.cs
+++ b/websocket-sharp/Server/HttpServer.cs
@@ -1059,13 +1059,14 @@ namespace WebSocketSharp.Server
     /// <summary>
     /// Starts receiving the HTTP requests.
     /// </summary>
+    /// <exception cref="InvalidOperationException">
+    /// There is no certificate.
+    /// </exception>
     public void Start ()
     {
-      var msg = checkIfCertificateExists ();
-      if (msg != null) {
-        _log.Error (msg);
-        return;
-      }
+      string msg;
+      if (!checkCertificate (out msg))
+        throw new InvalidOperationException (msg);
 
       start ();
     }