If a value other than an anonymous URI is used in the response end point of the addressing header included in the request message, the sending destination of the response message differs depending on the availability of the wsa:From/wsa:Address, wsa:ReplyTo/wsa:Address, and wsa:FaultTo/wsa:Address elements.

The following table lists and describes the relationship between availability of the elements and the sending destination of the response messages:

Table 37-2 Sending destination of the response messages

No.	Addressing header			Type of response message to be sent	Sending destination of the response message
	wsa:From/wsa:Address element	wsa:ReplyTo/wsa:Address element	wsa:FaultTo/wsa:Address element
1	Does not exist	Does not exist	Does not exist	Normal message	HTTP sending source
2				Abnormal message	HTTP sending source
3			Exists	Normal message	HTTP sending source
4				Abnormal message	wsa:FaultTo/wsa:Address element
5		Exists	Does not exist	Normal message	wsa:ReplyTo/wsa:Address element
6				Abnormal message	wsa:ReplyTo/wsa:Address element
7			Exists	Normal message	wsa:ReplyTo/wsa:Address element
8				Abnormal message	wsa:FaultTo/wsa:Address element
9	Exists	Does not exist	Does not exist	Normal message	HTTP sending source
10				Abnormal message	HTTP sending source
11			Exists	Normal message	HTTP sending source
12				Abnormal message	wsa:FaultTo/wsa:Address element
13		Exists	Does not exist	Normal message	wsa:ReplyTo/wsa:Address element
14				Abnormal message	wsa:ReplyTo/wsa:Address element
15			Exists	Normal message	wsa:ReplyTo/wsa:Address element
16				Abnormal message	wsa:FaultTo/wsa:Address element

http://www.w3.org/2005/08/addressing/none is a URI indicating that the message is not sent using the WS-Addressing 1.0 specifications. If this URI is set up in the wsa:ReplyTo/wsa:Address and wsa:FaultTo/wsa:Address elements of the addressing header, the response message is not sent.