Document/literal request and response messages in VS .NET

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Listing 3-3 Document/literal request and response messages
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<!-- Request document --> <soapenv:Envelope xmlns:xsi="http://wwww3org/2001/XMLSchema-instance" xmlns:xsd="http://wwww3org/2001/XMLSchema" xmlns:soapenv="http://schemasxmlsoaporg/soap/envelope/"> <soapenv:Body> <invoice xmlns="http://schemaslearnxmlwscom/invoice"> <invoiceNumber>123-YJK-9087</invoiceNumber> <supplierID>5</supplierID> <invoiceDate>2001-08-11</invoiceDate> <poNumber>PO-0983</poNumber> <subTotal>2190</subTotal>
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<salesTax>986</salesTax> <paymentReceived>0</paymentReceived> <amtDue>3176</amtDue> <terms>net 30</terms> <contactName>Yasser Shohoud</contactName> <contactNumber>(703) 626-6822</contactNumber> <promotion></promotion> <invoiceItems> <item> <partNum>1234-KUY</partNum> <quant>2</quant> <unitPrice>1095</unitPrice> <total>2190</total> </item> </invoiceItems> </invoice> </soapenv:Body> </soapenv:Envelope>
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<!-- Response document --> <soapenv:Envelope xmlns:xsi='http://wwww3org/2001/XMLSchema-instance' xmlns:xsd='http://wwww3org/2001/XMLSchema' xmlns:soapenv='http://schemasxmlsoaporg/soap/envelope/'> <soapenv:Body> <Receipt xmlns='http://schemaslearnxmlwscom/invoice'>9</Receipt> </soapenv:Body>
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</soapenv:Envelope>
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Both request and response documents are examples of document/literal SOAP messages The request document begins with the <soapenv:Envelope> element which contains <soapenv:Body> which in turn contains the invoice document In this example, the invoice document is the request message s payload The entire invoice document, beginning with <invoice> all belongs to the namespace http://schemaslearnxmlwscom/invoice which is the targetNamespace defined in the invoice s schema document invoicexsd Following the same structure, the response message s payload contains a simple document with one elmenet: <Receipt>, which contains the receipt number confirming that the invoice has been successfully processed SOAP Over HTTP While SOAP can be used over a variety of transports, HTTP is the most commonly used because of its ubiquity HTTP requests are very easy to form, they consist of simply an HTTP command such as POST or GET followed by the URL you re requesting and the protocol version eg HTTP 10 An HTTP request or response usually contains HTTP headers which are simple information organized in name-value pairs For example, this is an HTTP GET request for the resource /images/pp_header_02jpg with the two HTTP headers Accept and Referer (yes Referer has a typo, it s that way in the HTTP standard):
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GET /images/pp_header_02jpg HTTP/11 Accept: */* Referer: http://localhost/Logonasp url=/Defaultasp
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When using SOAP over HTTP, there are two rules to remember First, you must set the Content-Type header to text/xml telling the recipient that the HTTP request or response contains an XML document, ie a SOAP message Second, when sending a SOAP request, you must set the HTTP SOAPAction header This special header always contains a quoted value and is designed to convey extra information about the SOAP message at the HTTP level This can be useful for example for firewalls that filter SOAP/HTTP traffic based on certain values of the HTTP SOAPAction header There are no rules for the value of SOAPAction, you have to set it to whatever the Web service expects it to be This lack of definite rules has caused much controversy over the use of SOAPAction and whether it s needed at all Practically, you should not design your Web services to rely on SOAPAction unless you absolutely need to Listing 3-4 shows an example HTTP request with the above SOAP request message and the SOAPAction and Content-Type headers
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Listing 3-4 A SOAP message sent over HTTP
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POST /vbwsbook/chapter3/MessagingWS/invoiceMessagingasp HTTP/10 SOAPAction: "urn:InvoiceAction" Content-Type: text/xml
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Accept-Language: en-us Content-Length: 929 Accept: */* User-Agent: Mozilla/40 (compatible; Win32; WinHttpWinHttpRequest5) Host: localhost Connection: Keep-Alive
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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:Envelope>
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Capturing SOAP Messages Throughout this chapter and indeed the rest of the book, you ll need a way to capture SOAP messages exchanged between client and service for learning and troubleshooting purposes There are a few free tools that allow you to do this easily One of those tools, Trace Utility, comes with the Microsoft SOAP Toolkit and can be used to intercept and record SOAP messages between the client and server The tool works by inserting itself between the client and the Web server where your Web service is running Basically, it listens on a port that you specify, and forwards all traffic it receives to a Web server and port that you also specify Figure 3-7 shows an example of configuring it to listen on port 8080 and forward all traffic to the local server on port 80
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Figure 3-7 Configuring the Trace Utility
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Once you configure the Trace Utility to listen to a port such as 8080, you must make your client send all requests to this port on the localhost Therefore, instead of sending a SOAP request to http://hostname/myserviceasp , you d send it to http://localhost:8080/myserviceasp If you want to capture SOAP messages while running code in this chapter, simply run the Trace Utility and make it listen on port 8080 and replace the service URL in the code to point to port 8080 on the localhost The Trace Utility will intercept and capture the request and response messages and display them in the trace window
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The Web Service To show you how easy it is to create and process the messages in Listing 3-3, I created the example Web service in classic ASP using only the Microsoft XML parser MSXML version 40 as shown in Listing 3-5
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Listing 3-5 A classic ASP page that acts as a SOAP endpoint (VBWSServer\VBWSBook\3 \MessagingWS\invoiceMessagingasp)
<%@Language="VBScript" %> <% Const adVarChar=200 Const adInteger=3 Const adParamInput=1 Const adParamOutput=2 Const adCmdStoredProc=4 Dim CONNSTR Dim NS Dim XSD_LOC Dim requestDoc Dim doc Dim schemaCache Dim MY_ACTION
CONNSTR="provider=SQLOLEDB;server=(local);database=WSBook;uid=sa;pwd=;" NS="http://schemaslearnxmlwscom/invoice" 'Check the SOAPAction