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To make an RPC request for invocation, the following items are needed:
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The address of the targeted node that will ultimately process the request The name of the method/procedure you want to invoke The required parameters names and values to invoke the method/ procedure, including any output parameter and return value Optionally, data that may be carried as a part of SOAP header blocks
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It is important to note that the preceding information differs in subtle ways from the information needed to invoke other nonSOAP types of RPC. For example, the first item requires the address information of the SOAP node that contains or supports the target of the RPC. It is obviously the node that adopts the role of ultimate Receiver. The ultimate recipient can identify the target of the named procedure or method by looking for its URI. The way in which the target URI is made available depends on the underlying protocol binding. For example, the URI identification information can be carried in a SOAP header block. The other possibility is to carry the URI information outside the SOAP message. Such is the case for HTTP SOAP binding. Listing 12-5 shows an example of an RPC request for credit card payment. The travel reservation application provides credit card information, and the successful completion of the different activities results in the card being charged and a reservation code returned. This reserveand-charge interaction between the travel reservation application and the travel service application is modeled as a SOAP RPC. As seen in this example, the RPC information itself is carried in the body of the SOAP message. It is contained in a structure, which houses the reservation information and credit card information. The credit card information itself is contained in a substructure. This latter struct has three elements: name, card number and expiration date. The method invoked has the name chargeReservation.
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Listing 12-5
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Listing 12.5: An example of RPC SOAP request 1 < xml version='1.0' > 2 <env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope" > 3 <env:Header> 4 <t:transaction 5 xmlns:t=http://thirdparty.example.com/transaction
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env:encodingStyle=http://example.com/encoding env:mustUnderstand="true" >45</t:transaction> </env:Header> <env:Body> <c:chargeReservation env:encodingStyle="http://www.w3.org/2003/05/soap-encoding" xmlns:c="http://myCompany.example.com/"> <r:reservation xmlns:r="http://myCompany.example.com/reservation"> <r:code>AB324QZ</r:code> </r:reservation> <o:creditCard xmlns:o="http://mycompany.example.com/financial"> <n:name xmlns:n="http://mycompany.example.com/employees"> John Smith </n:name> <o:number>9876543212345678</o:number> <o:expiration>2010-07</o:expiration> </o:creditCard> </c:chargeReservation> </env:Body> </env:Envelope>
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Next we turn our attention to a RPC response. The response is also returned as a SOAP message. Let s assume that the response has two output parameters. The first output parameter provides a reference to the reservation code, and the second output parameter provides a URL where the details of the reservation can be viewed. As in the case of RPC, the response is returned in the body of the SOAP message, within a struct. The struct has the name of the RPC request (chargeReservation) with the word Response appended to it. The two output parameters are included as two elements in this struct. Listing 12-6 shows the response SOAP message.
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Listing 12-6
Listing 12.6: A sample SOAP message for a RPC response 1 < xml version='1.0' > 2 <env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope" > 3 <env:Header> 4 <t:transaction 5 xmlns:t="http://thirdparty.example.com/transaction" 6 env:encodingStyle="http://example.com/encoding" 7 env:mustUnderstand="true">45</t:transaction> 8 </env:Header> 9 <env:Body> 10 <r:chargeReservationResponse 11 env:encodingStyle="http://www.w3.org/2003/05/soap-encoding" 12 xmlns:r="http://myCompany.example.org/">
SOAP
13 14 15 16 17 18 19 <r:reservationCode> AB324QZ</m:reservationCode> <r:viewReservationAt> http://myCompany.example.com/reservations code= AB324QZ </r:viewReservationAt> </r:chargeReservationResponse> </env:Body> </env:Envelope>
SOAP HTTP Binding SOAP messages may be exchanged using a variety of underlying protocols. An example of such an underlying protocol is HTTP. The specification for how SOAP messages may be passed from one SOAP node to another using an underlying protocol is called a SOAP binding. SOAP defines a standard binding to only one protocol, namely HTTP. HTTP defines a well-known message-exchange pattern and a wellknown connection model. In HTTP, the client specifies a server by a URL and connects to it by using the TCP/IP network. Then it issues an HTTP request message and receives an HTTP response message over the same TCP connection. Therefore, in the HTTP protocol, there is an implicit correlation between the request and the response, and an application using HTTP binding can deduce the correlation between a SOAP message sent in the body of an HTTP request message and a SOAP message returned in the HTTP response. In a similar manner, HTTP identifies the request server end point via a URI, the RequestURI, which can also serve as the identification of a SOAP node at the request server. The HTTP binding to SOAP restricts the use of HTTP to two methods: POST and GET. The binding allows two ways to exchange SOAP messages. In the first method, the HTTP POST method is used to convey SOAP messages in the bodies of HTTP request and response messages. In the second method, the HTTP GET method in an HTTP request is used to return a SOAP message in the body of an HTTP response. The first usage pattern is the HTTP-specific instantiation of a binding feature called the SOAP request/response message-exchange pattern, whereas the second uses a feature called the SOAP response message-exchange pattern. SOAP offers guidance on circumstances when applications may use one of the two specified message-exchange patterns. The HTTP GET response exchange pattern is used when you are reasonably sure this exchange is for retrieval of information only and does not require a change in the state of the server from which the information is being requested. Such interactions are considered safe and idempotent in the HTTP specification. We ll now discuss examples of both types of HTTP bindings, starting with HTTP GET.
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