An Introduction to Simple Object Access Protocol
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by Joydip Kanjilal
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Anatomy of a SOAP Message

A client sends a SOAP message to the server.  This requesting data is also called a SOAP Request. The server receives the request, processes the same and sends a response back to the client. This returning data is known as the SOAP Response.  This communication back and forth between the client and the server takes place through HTTP protocol.

The following constitute a SOAP message declaration:

·         An envelope element that recognizes then XML file format which will be sent across as a SOAP message

·         An optional element that can describes header information

·         The description of the body which contains the information of the request and the response elements

·         Provision for another optional element that provides information as and when an error occurs

The SOAP format is clearly illustrated in listing 1 that follows.

Listing 1: A SOAP message format

<SOAP: Envelope>
  <SOAP: Header>
  </SOAP: Header>
  <SOAP: Body>
  </SOAP: Body>
</SOAP: Envelope>

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