The None consists of the None and None. This provides support for using "plain old XML" (POX)-style messaging. Enabling basic POX messaging is now a matter of setting up an HTTP binding on your service with a text encoder that uses None.
Note that when a service is configured with the BasicHttpBinding and the MessageVersion is set to None, the action header in a request message is removed from the response message. This is consistent with the way ASMX services work.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)