Design a Web service for an asynchronous, document-style process and describe how to refactor a Web service from a synchronous to an asynchronous model.

  1. Refactor Server's Web Service to one-way (asynchronous) from two-way (synchronous).

  2. Add some identification information in SOAP message (can be implemented using header with unique ID value).

  3. Deploy new Web Service on the Client and allow Server call back client when Server processed incoming message and ready to return results to caller (Client).

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