4 parts of SOAP Message Transportation
1) Endpoint This is the URL or Address where the SOAP request is delivered. It must be able to reach that endpoint over the network in order for the communication to succeed. 2) Action String that is often optional with the SOAP web service. However, some services do require this to be set. The string is often descriptive of what action should be performed by the web services. 3) Headers/Attributes Found within the HTTP request. They contain information regarding the protocol being used as well as other custom information such as session IDs, authentication token, etc. 4) Envelope Actual document that describes the details of the SOAP request. This is written in XML format. Has a header and a body similar to an HTML webpage. Header and body details are dictated by the web service and explained in a corresponding WSDL document