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Content-Type: text/xml; charset="utf-8"
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Content-Length: nnnn
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<env:Envelope xmlns:env="http://wwww3org/2001/12/
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soap-envelope" >
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<env:Body>
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<env:Fault>
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<faultcode>env:Server</faultcode>
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<faultstring>Server Error</faultstring>
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<detail>
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<e:myfaultdetails xmlns:e="http://
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wwwxmlbuscom/faults" >
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<message>
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Understanding Web Services- XML, WSDL, SOAP and UDDI
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The database was unavailable </message> <errorcode>1001</errorcode> </e:myfaultdetails> </detail> </env:Fault> </env:Body> </env:Envelope>
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The example illustrates a SOAP fault block generated as the result of a failure during the processing of a body block Again, the HTTP 500 error is returned along with the fault response This time, however, the <detail> element is provided to give additional information about the error that caused the fault block to be returned, in this case to signal that processing failed because the database was unavailable
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RPC Convention
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The SOAP specification includes an optional definition of how to encapsulate remote procedure call (RPC) functionality using XML For the RPC-oriented interaction pattern, this is the heart of SOAP Requirements for the RPC mapping include providing a URI for the target SOAP node, a procedure or method name, an optional procedure or method signature, and the parameters to the procedure or the method Optional header data can be included to pass security information, transaction context, or other attribute information that may be associated with the procedure call A major feature is mapping SOAP messages to remote procedure calls
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SOAP relies on the underlying transport mechanism, such as HTTP, to carry the URI address of the message destination Life-cycle management for the objects accessed via Web services are outside the SOAP spec, but it is possible to send cookies via the SOAP headers to implement such additional features at the application level An RPC invocation is modeled as a single struct containing an accessor for each in or in/out parameter The struct is named and typed identically to the target procedure or method name Each in or in/out parameter is viewed as an accessor, with a name corresponding to the type of the parameter, in the same order as in the target procedure or method (See Data Type Mapping later in this chapter for further information on SOAP data types) RPC invocations are modeled as structs
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The request struct name is identical to the method name so that the mapping occurs correctly The response struct name is defined using a naming convention that makes it easier for the SOAP processor to map the response from a program For the RPC mapping, the use of headers roughly corresponds to the use of attributes in the runtime environment for the target procedure or method, such as what may be defined for an EJB container or NET package attributes
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Understanding Web Services- XML, WSDL, SOAP and UDDI
A response message indicates that the request message was successfully processed A fault message indicates that a failure occurred either before or during message processing A SOAP processor cannot return both a response message and a fault message The result can be a fault message or a response message, but not both
The following example illustrates a request/response SOAP message definition The example contains a SOAP message in the form of a request to a purchase order service that totals the purchase order and returns the total value of the order The customer can then decide whether to confirm the order
< xml version="10" > <SOAP-ENV:Envelope xmlns:SOAP ENV="http://schemasxmlsoaporg/soap/envelope/" xmlns:xsd="http://wwww3org/2001/XMLSchema" xmlns:xsd1="http://wwwxmlbuscom/PurchaseOrderService xsd" xmlns:SOAP ENC="http://schemasxmlsoaporg/soap/encoding/" xmlns:xsi="http://wwww3org/2001/XMLSchema-instance"> <SOAP-ENV:Body> <ns1:postPurchaseOrder xmlns:ns1="http://wwwxmlbuscom/PurchaseOrderService"> <order xsi:type="xsd1:PurchaseOrder"> <CompanyName xsi:type="xsd:string">IONA</CompanyName> <Items xsi:type="SOAP-ENC:Array" SOAP-ENC:arrayType="xsd1:Item[1]"> <item xsi:type="xsd1:Item"> <Price xsi:type="xsd:float">12999</Price> <PartID xsi:type="xsd:string">1234</PartID> <Description xsi:type="xsd:string"> SkateBoots </Description> <Quantity xsi:type="xsd:int">40</Quantity> </item>
</Items>
<Address xsi:type="xsd1:Address">
<State xsi:type="xsd:string">MA</State> <PostalCode xsi:type="xsd:string">02451</PostalCode> <City xsi:type="xsd:string">Waltham</City> <Line2 xsi:type="xsd:string"></Line2> <Country xsi:type="xsd:string">USA</Country> <Line1 xsi:type="xsd:string">200 West Street</Line1> </Address> </order>
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Understanding Web Services- XML, WSDL, SOAP and UDDI
The example includes a reference to the associated XML schema for the application-defined parts of the message (PurchaseOrderService-xsd) and the post request (postPurchaseOrder), which also uses an XML namespace to qualify the element names in the request The two major categories of data types are shown, including a simple, schemastandard string type for the CompanyName, and a custom- defined SOAP array type for the items Note that the custom-defined array is included within the PurchaseOrderService-xsd schema