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SystemWebServicesProtocolsSoapHeaderAttribute("SessionHeaderValue"), _ SystemWebServicesProtocolsSoapDocumentMethodAttribute( _ "http://wwwLearnXmlWScom/customerorders/GetCustomersDataSetCompressed ", _ RequestNamespace:="http://wwwLearnXmlWScom/customerorders", _ ResponseNamespace:="http://wwwLearnXmlWScom/customerorders", _ Use:=SystemWebServicesDescriptionSoapBindingUseLiteral, _ ParameterStyle:=SystemWebServicesProtocolsSoapParameterStyleWrapped)> _ Public Function GetCustomersDataSetCompressed() As SystemDataDataSet Dim results() As Object = _ MeInvoke("GetCustomersDataSetCompressed", New Object(-1) {}) Return CType(results(0), SystemDataDataSet) End Function
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I then added code to the client that invokes the GetCustomersDataSetCompressed method Using proxyTrace, I captured the request and response messages as shown in figure 10-9
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Figure 10-9 The request and response messages with compressed data
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Finally, I wanted to test applying the compression extension via webconfig So I created a new Web service named CustomerOrdersCompressed and placed it in VBWSBook\10 \CompressedService\CustomerOrdersCompressedasmxvb The code in this Web service is simply a complete copy of the CustomerOrders Web service code I then added a webconfig file to the CompressedService folder and added to it a soapExtensionTypes section as well as a compressionType key as shown in listing 10-15 Listing 10-15 Applying the compression SOAP extension via Webconfig (VBWSBook\10\CompressedService\webconfig)
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<configuration> <appSettings> <add key="CompressionType" value="gzip"/> </appSettings> <systemweb> <webServices> <soapExtensionTypes> <add type="LearnXmlWSWebServicesInfrastructureCompressExtension,Infrastructure" priority="0" group="0"/> </soapExtensionTypes> </webServices> </systemweb> </configuration>
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On the client, I added a Web reference to this service then manually edited the proxy class and added the CompressAttribute to each of LogOn, LogOff, GetCustomersDataSet and GetCustomerXml methods The updated proxy is in VBWSClientCode\10\SecurityTestClient\vbwsserver1\Referencevb) Since the extension is applied to the entire Web service, all calls to this service (eg LogOn, LogOff, and GetCustomersDataSet) will be compressed as shown in figure
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Figure 10-10 Calls to all methods, eg LogOn, are compressed
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SOAP Extensions provide an extensibility mechanism for adding custom behavior to Web service request/response processing By encapsulating infrastructure services such as security and usage accounting in SOAP extensions, you can build a reusable, flexible, infrastructure components Developers can apply such components to their Web services using webconfig files or CLR custom attributes
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[1] There were no implementations of WS-Security at the time of this writing Therefore it didn t make sense to write too much about it in this book as it s still subject to change I ll update the online WSSecurity section as implementations become available [2] I do this check to protect against users entering a or b= b as the user id which would always return all records in the Users table This means it s insufficient to check whether there were records returned [3] ASPNET applications (including Web services) run by default under a Windows account called ASPNET which has limited privileges Specifically, it lacks the ability to write to the registry under HKLM When a Web service tries to write to the event log with a new event source name, a new event source must be created which means the Web service needs to write to HKLM By default, this results in an access denied exception and the Web service will not work To work around this, either create your event log sources
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when you deploy your Web services, or make sure the ASPNET account has the permissions to write to the registry Alternatively, you can replace the ASPNET account with a more powerful account for development purposes You do this in machineconfig by changing the <processModel> element like this:
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<processModel userName="system" password="AutoGenerate" /> For more information on the ASPNET process identity see the http://gomicrosoftcom/fwlink/ LinkId=5903
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"Discovery consists in seeing what everyone else has seen and thinking what no one else has thought" -Albert Szent-Gyorgi
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In a world full of Web services, Universal Description Discovery and Integration, UDDI, becomes an extremely valuable component As a service built into Windows NET server, UDDI is also likely to become the de-facto standard Web services catalog within the enterprise Therefore, to complete the Web services story, I will explain what UDDI is and the scenarios where applications can benefit from private as well as public UDDI implementations I will focus on writing UDDI-enabled applications that communicate with UDDI as a SOAP-based Web service
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