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HTTP GET Usage
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SOAP response message exchange patterns are limited to the HTTP GET method. In this pattern, the response to an HTTP GET request is in the form of a SOAP message sent in an HTTP response. Listing 12-7 shows the HTTP GET request. This is used to request travel information from a travel website with the following URI:
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http://myCompany.example.com/reservations code= AB324QZ
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At this site the travel itinerary can be viewed.
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Listing 12-7
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Listing 12.7: Example of HTTP GET request GET /myCompany.example.com/reservations code= AB324QZ Host: myCompany.example.com Accept: text/html;q=0.5, application/soap+xml HTTP/1.1
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The preferred representation of the information from the source is indicated in the HTTP header. In this example, the preferred representation is
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application/soap+xml
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which is meant for consummation by an application rather than by a browser. The response to the preceding GET request is shown in Listing 12-8. In this case, the response is returned as a SOAP message in the body of an HTTP response.
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Listing 12-8
Listing 12.8: Response to HTTP GET request of listing 12-7 1 HTTP/1.1 200 OK 2 Content-Type: application/soap+xml; charset="utf-8" 3 Content-Length: 367 4 5 < xml version='1.0' > 6 <env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope"> 7 <env:Header> 8 <m:reservation 9 xmlns:m="http://myCompany.example.com/reservation" 10 env:role="http://www.w3.org/2003/05/soap11 envelope/role/next" 12 env:mustUnderstand="true"> 13 <m:date>2008-07-13</m:date> 14 </m:reservation> 15 </env:Header> 16 <env:Body>
SOAP
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<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntaxns#" xmlns:x="http://myCompany.example.com/vocab#" env:encodingStyle="http://www.w3.org/1999/02/22-rdf-syntaxns#"> <x:ReservationRequest rdf:about="http://myCompany.example.com/reservations code= AB324QZ "> <x:passenger>John Smith</x:passenger> <x:outbound> <x:TravelRequest> <x:to>Chicago</x:to> <x:from>Dallas</x:from> <x:date>2008-07-12</x:date> </x:TravelRequest> </x:outbound> <x:return> <x:TravelRequest> <x:to>Dallas</x:to> <x:from>Chicago</x:from> <x:date>2008-07-13</x:date> </x:TravelRequest> </x:return> </x:ReservationRequest> </rdf:RDF> </env:Body> </env:Envelope>
HTTP POST Usage
The SOAP request/response message-exchange pattern is restricted to the HTTP POST method if HTTP binding is used. This pattern is available to all applications. It can be used for general exchange of XML data or RPCs. An example of an RPC exchange with the request is shown in Listing 12-9 and the response is shown in Listing 12-10. In Listing 12-9, the request is directed to the server myCompany .example.com, and the SOAP request is sent in the body of an HTTP POST request. In this case, the request is directed at the method chargeReservation. The HTTP POST response is shown in Listing 12-10. For brevity, the details have been omitted. The appearance of the code 200 in the first line of the HTTP response header indicates that the POST request is successful.
Listing 12-9
Listing 12.9: An example of RPC request using HTTP POST method 1 POST /Reservations HTTP/1.1 2 Host: myCompany.example.com 3 Content-Type: application/soap+xml; charset="utf-8"
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4 Content-Length: 367 5 6 < xml version='1.0' > 7 <env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope" > 8 <env:Header> 9 <t:transaction 10 xmlns:t="http://thirdparty.example.com/transaction" 11 env:encodingStyle="http://example.com/encoding" 12 env:mustUnderstand="true" >45</t:transaction> 13 </env:Header> 14 <env:Body> 15 <m:chargeReservation 16 env:encodingStyle=http://www.w3.org/2003/05/soapencoding 17 xmlns:m="http://myCompany.example.com/"> 18 <m:reservation xmlns:m="http://myCompany.example.com/ reservation"> 19 <m:code> AB324QZ </m:code> 20 </m:reservation> 21 <c:creditCard xmlns:c="http://myCompany.example.com/ financial"> 22 <n:name xmlns:n="http://myCompany.example.com/ employees"> 23 John Smith 24 </n:name> 25 <c:number>6789234512345678</c:number> 26 <c:expiration>2010-10</c:expiration> 27 </c:creditCard> 28 </m:chargeReservation 29 </env:Body> 30 </env:Envelope>
Listing 12-10
Listing 12.10: The HTTP POST response to the request shown in Listing 12.9 1 HTTP/1.1 200 OK 2 Content-Type: application/soap+xml; charset="utf-8" 3 Content-Length: 167 4 5 < xml version='1.0' > 6 <env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope" > 7 <env:Header> 8 ... 9 ... 10 </env:Header> 11 <env:Body> 12 ... 13 ... 14 </env:Body> 15 </env:Envelope>
SOAP
Conclusion In summary, SOAP is an XML-based message format that can be used to exchange typed and structured information between peers (applications) in a distributed environment. SOAP also describes a set of rules for serialization and deserialization. Although a SOAP message can be transported by any transport protocol, the SOAP specification describes a specific binding to HTTP. Furthermore, SOAP supports a number of message-exchange patterns, including remote procedure calls. In the next chapter, we describe the third of the four standards that make up Web Services. This third standard is called Web Services Description Language (WSDL) and is used to describe the Web Services in a language and platform independent manner. Once again, this standard is based on XML.
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