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Describe the formats and protocols used by AJAX

  •  The client web page is creates the XmlHttpRequest, and thus the connection from the web page to an application on the server. 
  •  Part of that connection determines how the response can be produced to the client code - via the use of a ''callback'' routine. 
  •  The callback routine is called multiple times which come with a status code which indicates the reason for the invocation. 
  •  When a request can be successfully completed by the server application, a response should also be produced.