Tutorial: ASP.NET .NET Professional ASP.NET 1.0 2002 Edition : Exposing Web Services Tutorial
Complete Online Chapter 'Exposing Web Services' from Wrox Press book 'Professional ASP.NET 1.0 2002 Edition'. Topics covered include 'Web Services', 'SOAP Headers', 'Synchronous vs Asynchronous' and 'Data Caching'.
Tutorial Details:
ASP.NET .NET Professional ASP.NET 1.0 2002 Edition : Exposing Web Services Tutorial Web Services aren't a new concept. They allow distributed applications to share business logic over a network. The classic Web Service example scenario is a stock quote service: one company provides a service that can accept requests for stock symbols and responds with stock quote details. A company building an investment site can then use the application logic provided by the stock quote company to retrieve stock quote details.
This problem sounds relatively simple, but it has proven quite difficult to solve in the past. That's due largely to proprietary protocol formats, such as RMI, and the lock-down of open ports to only port 80 (for HTTP) and port 443 (for HTTPS).
What is new is the use of XML and HTTP, which are open standards, rather than proprietary serialization formats such as DCOM, RMI, or CORBA (although CORBA isn't proprietary, each vendor's CORBA implementation is unique to that vendor).
By using standard web protocols such as HTTP, and data description languages such as XML, to exchange data over common ports Web Services can utilize the ubiquitous HTTP infrastructure support that is already in place.
The technical definition of a Web Service is programmable application logic accessible via standard web protocols. Behind this definition are two important points: Programmable application logic - Web Service is implementation-non-
specific. The application logic can be implemented by components, by Perl scripts, or by any other mechanism that supports XML.
Standard web protocols - Web Services use Internet transport protocols such as HTTP or SMTP. The union of XML and HTTP forms Simple Object Access Protocol (SOAP). SOAP is a W3C submitted note (as of May 2000) that uses HTTP and XML to encode and transmit application data.
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