In the synchronous communication, the Web Service client sends a request message for invoking a service method in a Web Service, and receives the resulting response message from the Web Service.

The following figure shows the flow of synchronous communication:

Figure 37-1 Flow of synchronous communication

To use the synchronous communication, set up the anonymous URI http://www.w3.org/2005/08/addressing/anonymous defined in the WS-Addressing 1.0 specifications, with the wsa:ReplyTo/wsa:Address element of the addressing header.

The following are the examples of the contents specified in the addressing header with the conditions:

• Web Service URI
  http://localhost/addressing/AddNumbersImplService
  
• Action value for invoking the Web Service
  http://sample.com/input
  
• Anonymous URI
  http://www.w3.org/2005/08/addressing/anonymous
  
• Unique ID indicating this message
  uuid:4cfb4248-a552-4e33-a610-6af94f2aad07
  

  <To xmlns="http://www.w3.org/2005/08/addressing"> http://localhost/addressing/AddNumbersImplService </To> <Action xmlns=http://www.w3.org/2005/08/addressing> http://sample.com/input </Action> <ReplyTo xmlns="http://www.w3.org/2005/08/addressing"> <Address>http://www.w3.org/2005/08/addressing/anonymous</Address> </ReplyTo> <MessageID xmlns="http://www.w3.org/2005/08/addressing"> uuid:4cfb4248-a552-4e33-a610-6af94f2aad07 </MessageID>