--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/eric6/Helpviewer/Network/NetworkProtocolUnknownErrorReply.py	Sun Apr 14 15:09:21 2019 +0200
@@ -0,0 +1,55 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2009 - 2019 Detlev Offenbach <detlev@die-offenbachs.de>
+#
+
+"""
+Module implementing a QNetworkReply subclass reporting an unknown protocol
+error.
+"""
+
+from __future__ import unicode_literals
+
+from PyQt5.QtCore import QTimer
+from PyQt5.QtNetwork import QNetworkReply
+
+
+class NetworkProtocolUnknownErrorReply(QNetworkReply):
+    """
+    Class implementing a QNetworkReply subclass reporting an unknown protocol
+    error.
+    """
+    def __init__(self, protocol, parent=None):
+        """
+        Constructor
+        
+        @param protocol protocol name (string)
+        @param parent reference to the parent object (QObject)
+        """
+        super(NetworkProtocolUnknownErrorReply, self).__init__(parent)
+        self.setError(
+            QNetworkReply.ProtocolUnknownError,
+            self.tr("Protocol '{0}' not supported.").format(protocol))
+        QTimer.singleShot(0, self.__fireSignals)
+    
+    def __fireSignals(self):
+        """
+        Private method to send some signals to end the connection.
+        """
+        self.error.emit(QNetworkReply.ProtocolUnknownError)
+        self.finished.emit()
+    
+    def abort(self):
+        """
+        Public slot to abort the operation.
+        """
+        # do nothing
+        pass
+    
+    def bytesAvailable(self):
+        """
+        Public method to determined the bytes available for being read.
+        
+        @return bytes available (integer)
+        """
+        return 0