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Communicating Error Information Going back to the invoice messaging application, I added a simple procedure called SendFault to invoiceMessagingasp I also changed the error handling code in invoiceMessagingasp to invoke this new procedure with the right parameters and end the response Listing 3-13 shows this procedure along with two examples of calling it
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Listing 3-11 Communicating error information using <soapenv:Fault> and custom <detail> child elements
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'An example of calling SendFault 'To indicate the schema document could not be loaded Call schemaCacheAdd(NS,XSD_LOC) If ErrNumber <> 0 Then Call SendFault("vbws:Application","Failed to add schema",ErrSource,ErrDescription,Errnumber) ResponseEnd End If '
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'SendFault procedure Sub SendFault(faultCode,faultString,source,descr,num) Dim faultMsg faultMsg = "<soapenv:Fault xmlns:vbws='" & NS & "'><faultCode>" & _ faultCode & "</faultCode>" & _ "<faultString>" & faultString & "</faultString>" & _ "<detail><vbws:ErrNumber>" & num & "</vbws:ErrNumber>" & _ "<vbws:ErrDescr>" & descr & "</vbws:ErrDescr>" & _ "<vbws:ErrSource>" & source & "</vbws:ErrSource>" & _ "</detail></soapenv:Fault>" Call WriteSOAPResponse(faultMsg) End Sub
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The parameters to SendFault are the faultCode, faultString, which are reported in <faultCode> and <faultString> resepectively, and source, descr, and num which are reported in the custom detail child elements <vbws:ErrSource>, <vbws:ErrDescr>, and <vbws:ErrNumber> respectively Listing 3-14 shows a example response message with fault information in response to a failure to load the XSD schema respectively
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Listing 3-12 Example SOAP responses with error information in <soapenv:Fault>
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<!-- response to schema not found error --> <soapenv:Envelope xmlns:xsi='http://wwww3org/2001/XMLSchema-instance' xmlns:xsd='http://wwww3org/2001/XMLSchema' xmlns:soapenv='http://schemasxmlsoaporg/soap/envelope/'> <soapenv:Body> <soapenv:Fault xmlns:vbws='http://schemaslearnxmlwscom/invoice'> <faultCode>vbws:Application</faultCode> <faultString>Failed to add schema</faultString> <detail> <vbws:ErrNumber>-2146697210</vbws:ErrNumber> <vbws:ErrDescr>System error: -2146697210</vbws:ErrDescr> <vbws:ErrSource>msxml4dll</vbws:ErrSource> </detail> </soapenv:Fault> </soapenv:Body> </soapenv:Envelope>
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Note that I used the custom fault code vbws:Application for communicating the application-sepcific error of failing to load the schema
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SOAP provides only the bare minimum functionality required to invoke Web services and leaves it up to implementors to extend it in ways to meet the client and service needs SOAP header elements are a means of extending SOAP functionality by communicating information that is not necessarily part of the message data but is needed to process the message, such as user credentials, session id or transaction id <soapenv:Header> is an optional child element of <soapenv:Envelope> that can be used to convey such information in the form of application-defined child elements Headers can be sent with the request and response messages to communicate information to the service or the client resepctively A Web service might define an <authInfo> header element that contains two subelements for the user id and password as shown in Listing 3-15 Clients invoking this Web service would then insert user credentials into this header with each request to the Web service
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Listing 3-13 Providing user credentials in SOAP headers
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<soapenv:Envelope xmlns:xsi='http://wwww3org/2001/XMLSchema-instance' xmlns:xsd='http://wwww3org/2001/XMLSchema' xmlns:soapenv='http://schemasxmlsoaporg/soap/envelope/'> <soapenv:Header> <authInfo xmlns="http://schemaslearnxmlwscom/appHeader"> <uid>jgalt</uid> <pwd>motor</pwd> </authInfo> </soapenv:Header> </soapenv:Envelope>
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Since custom header elements are application-defined, a client might send a header element to a service which does not understand this header In many cases, the sender (whether client or service) of a SOAP message with a particular, application-defined header might require that the receipient understand this header To satisfy this requirement, SOAP defines a soapenv:mustUnderstand attribute that can be placed on a header element and set to 1 meaning that the receipient must understand this header or send back a <soapenv:Fault> indicating that it does not understand the header For example, if a client invokes a Web service and specifies a quality of service (QoS) header indicating that it needs the response within 200 milliseconds or less If the Web service does not understand the <QoS> header, it might process the message anyway taking longer than the requested 200 milliseconds which would not meet the client s needs To ensure the service understand the header or returns a <soapenv:Fault>, the client adds soapenv:mustUnderstand="1" to the <QoS> header as shown in Listing 3-16
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Listing 3-14 Using soapenv:mustUnderstand <soapenv:Envelope xmlns:xsi='http://wwww3org/2001/XMLSchema-instance' xmlns:xsd='http://wwww3org/2001/XMLSchema' xmlns:soapenv='http://schemasxmlsoaporg/soap/envelope/'> <soapenv:Header> <QoS xmlns="http://schemaslearnxmlwscom/appHeader" soapenv:mustUndertand="1"> <resp>200</resp> </QoS > </soapenv:Header> </soapenv:Envelope
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