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SOAP , originally defined as Simple Object Access Protocol , is a protocol specification for exchanging structured information in the implementation of Web Services in computer networks . It relies on Extensible Markup Language (XML) for its message format, and usually relies on other Application Layer protocols, most notably Hypertext Transfer Protocol (HTTP) or Simple Mail Transfer Protocol (SMTP), for message negotiation and transmission. [ edit ] Characteristics SOAP can form the foundation layer of a web services protocol stack , providing a basic messaging framework upon which web services can be built. This XML based protocol consists of three parts: an envelope, which defines what is in the message and how to process it, a set of encoding rules for expressing instances of application-defined datatypes, and a convention for representing procedure calls and responses.
Robert van Engelen GENIVIA INC Feb 3, 2013 [This document is also available in PDF format (black and white only)] Copyright (C) 2000-2012 Robert A. van Engelen, GENIVIA INC, All Rights Reserved. 1 Introduction The gSOAP tools provide an automated SOAP and XML data binding for C and C++ based on compiler technologies.
Introduction One would think that writing a client application using the Simple Object Access Protocol (SOAP) in Visual C++ would be a non-trivial task. SOAP interface calls are (more or less) human-readable text transported across HTTP, a ubiquitous Internet transport protocol. It should be a simple matter of putting together the proper data payload, wrapped in properly formatted HTTP and SOAP headers, and sending the message across the wire, taking into account SSL security. The reality is interacting with eBay using SOAP and C++ is not as straightforward as one might think.