Dissecting the SOAP Message

You can divide SOAP messages into two basic categories: Requests and responses. The client sends a request to the server. If the server can fulfill the request, then it sends a data message back to the client. Otherwise, the server sends an error message indicating why it couldn’t send a response back to the client. In most cases, the problem is one of security, access, equipment failure, or an inability to find the requested object or data.

SOAP messages don’t exist within a vacuum. If you send just a SOAP message, it will never reach its destination. Remember from Chapter 1 that SOAP is a wire protocol—it relies on another protocol for transport. This is the same technique used by other wire protocols, so there’s ...

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