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Introducing Web Services Enhancements 3.0
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WSE generally refers to both a software development toolkit and an add-on processing infrastructure for implementing the WS- specifications in .NET projects. From an infrastructure perspective, WSE is basically a processing engine for applying the WS- specifications to SOAP messages. As you have seen, WS- specifications are stamped across different parts of a SOAP message. All of the WS- specifications append to the SOAP message header, while some of them also modify the SOAP message body directly (such as the WS-Security specifications). WSE automatically modifies SOAP messages to implement the WS- specifications. It also provides the infrastructure for processing these SOAP messages. In this sense it is similar to the ASP .NET Web services infrastructure, which provides SOAP and communications infrastructure support for the Web services you create using a friendlier API. Overall, the goal of WSE is to save developers from having to write custom code to implement basic required Web service infrastructure (such as security and policy). WSE 3.0 is an SDK package for Microsoft .NET developers that includes the following: The Microsoft.Web.Services3 assembly: This provides an API and includes several support classes, such as SOAP extensions and custom handlers. Documentation and help files: These show you how to use and configure the WSE API and utilities. QuickStart samples: These show you how to code with WSE. Configuration Editor: This utility provides a GUI interface for configuring WSE in your .NET projects. X.509 Certificate Tool: This utility helps you work with X.509 digital certificates. Policy Wizard: This utility provides a GUI for generating XML policy expression files (located inside the Configuration Editor).
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How the WSE Processing Infrastructure Works
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WSE installs a set of filters that intercept and process inbound and outbound SOAP request messages, as shown in Figure 5-1. The WSE filters work together inside a processing pipeline that also integrates with the ASP .NET processing pipeline. When a client application generates a SOAP request that includes WS enhancements, it specifies these in code using the API provided by WSE. When the message is sent out, it goes through a set of WSE filters that translate the code into SOAP extensions that are then applied directly to the SOAP message.
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CHAPTER 5 WEB SERVICES ENHANCEMENTS 3.0
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Figure 5-1. WSE processing of SOAP messages The WSE filters are dedicated to specific WS- specifications, or to groups of related specifications, including Security (including WS-Security) Policy (including WS-Policy and WS-Policy Attachments) Messaging (including WS-Addressing) WSE is an extension to the existing ASP .NET framework and is dedicated to modifying and processing SOAP messages. WSE must be configured to work with a project. Even if it is installed on your machine, it will not automatically apply to your projects unless they are configured to use it. When you use WSE in a project, you register one of its assembly types as a SOAP extension class. When you want to use WSE in a project, you must add a reference to the Microsoft.Web. Services3 project. You must also register the Web services configuration class in the project s web.config file, as shown in Listing 5-2. Listing 5-2. The WSE Configuration Class <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <configSections> <section name="microsoft.web.services3" type="Microsoft.Web.Services3.Configuration.WebServicesConfiguration, Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> </configSections> </configuration>
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CHAPTER 5 WEB SERVICES ENHANCEMENTS 3.0
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If the project is an ASP .NET Web service or application, you must also register the WSE SOAP extension classes in the web.config file, as shown in Listing 5-3. Listing 5-3. The WSE SOAP Extension Type <system.web> <webServices> < soapServerProtocolFactory type="Microsoft.Web.Services3.WseProtocolFactory, Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/> </soapServerProtocolFactory> <soapExtensionImporterTypes> <add type="Microsoft.Web.Services3.Description.WseExtensionImporter, Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/> </soapExtensionImporterTypes> </webServices> </system.web> This step instructs WSE to process the project s SOAP messages through its filters. By default, WSE automatically applies all of its filters to SOAP messages. However, you can optimize the process by turning off selected filters. For example, if you do not implement routing and referral, you can turn off the related filters. This simply means that WSE will stop looking for these related elements when it processes incoming and outbound SOAP messages.
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Note WSE 3.0 ships with a utility called the Configuration Editor, which will automatically generate for
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you the configuration XML in Listing 5-2 and Listing 5-3. These listings are the same in every project, so you should not have to manually enter them. The Configuration Editor is reviewed later in this chapter in the section titled Install and Configure WSE 3.0.
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