Beginning Web Development With Perl : From Novice to ... - Nabo

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138CHAPTER 7 ■ SOAP-BASED WEB SERVICESactually optional, although it’s almost always included. The SOAP body contains the heart ofthe SOAP message. Here’s an example of a SOAP request:44.52-89.582005-04-23512 hourlyThis example sends a request to the United States National Weather Service for forecastdata that the site has available through SOAP. The entire message is encapsulated within the section, which contains the SOAP body inside the section.Naturally, since I already stated that the SOAP header is almost always included, I foundan example that doesn’t contain the SOAP header.When connecting to a web service, you need to know the address of the service, includingtransport information. Since SOAP can be transported over so many different types of protocols(HTTP, e-mail, or some other protocol), the address information not only shows wherethe web service resides, but also how to communicate with it. In addition to the address information,the namespace of the web service must also be included. The namespace is used tofurther locate the web service on the server itself. Finally, the method or function to be calledon the remote server, along with any parameters, are included in the SOAP call. In the sampleSOAP request, I provide parameters as required by the receiving application.The parameters required by a given SOAP service are usually defined in the service definitiondocument known as the Web Service Definition Language (WSDL). The WSDL describes theinterfaces for a given web service. Using the WSDL, the programmer can determine the names ofthe services offered, along with the required parameters and their data types. As you’ll see in thenext section, Perl’s SOAP::Lite module can also use the WSDL to handle some of the heavy liftingfor the programmer.SOAP has become popular because it is built to use well-known protocols such as HTTPand XML. Several popular web sites have SOAP interfaces available. Table 7-1 lists a select fewof these services, along with a short description of each.
CHAPTER 7 ■ SOAP-BASED WEB SERVICES 139Table 7-1. Some Web Sites with SOAP InterfacesSite/Service Description Information URLAmazon.com Numerous web services to expose http://www.amazon.com/gp/aws/data on products at Amazon.com landing.htmlNational Web services to expose forecasts and http://weather.gov/xml/Weatherconditions based on latitude andServicelongitude; available for U.S. locationsGoogle Interfaces to query Google’s directory http://www.google.com/apis/and moreSOAP Meets Perl: SOAP::LiteOne package in Perl, SOAP::Lite, stands apart from other modules capable of talking SOAP.SOAP::Lite enables a developer to create both a SOAP client to send SOAP requests and a SOAPlistener to receive SOAP requests. SOAP::Lite is a collection of a number of other SOAP- andXML-related packages in Perl, so importing SOAP::Lite into a program’s namespace effectivelymakes numerous functions available to your program.The SOAP::Lite package is available with many Linux distributions and also at yourfavorite CPAN mirror. Some of the classes available with SOAP::Lite include the following:• SOAP::Data• SOAP::Deserializer• SOAP::Header• SOAP::Lite• SOAP::Parser• SOAP::Serializer• SOAP::Server• SOAP::TransportImporting and Debugging SOAP:LiteFirst things first—you need to know how to import and, more important, how to debug thepackage. As with other packages, you first import SOAP::Lite into your program’s namespacewith the use pragma:use SOAP::Lite;When importing into the namespace, you can specify some debugging, or tracing as it’sknown to SOAP::Lite. This tracing can be helpful—no, more appropriately, this tracing canbe a huge time- and headache-saver—when working with web services. Like other debugging,such as that for Net::SMTP, SOAP::Lite tracing can show method calls and other usefulbits that can assist in troubleshooting a call to a web service. Multiple levels of tracing areavailable with SOAP::Lite. Some levels are applicable to the client only, the server only, orboth. Table 7-2 lists some the events that are traceable with SOAP::Lite.
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Beginning Web Development with Perl
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PART 5 ■ ■ ■ Creating Web Tem
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■CONTENTSvii■CHAPTER 4 System I
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■CONTENTSixCreating a SOAP Listen
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■CONTENTSxiTemplate Toolkit Synta
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About the Author■STEVE SUEHRING i
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AcknowledgmentsThanks to James Lee
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xx■INTRODUCTIONThis book will use
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CHAPTER 1■ ■ ■The CGI ModuleT
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CHAPTER 1 ■ THE CGI MODULE 5for t
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CHAPTER 2■ ■ ■Popular CGI Mod
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CHAPTER 2 ■ POPULAR CGI MODULES 3
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50CHAPTER 3 ■ DATABASES AND PERLT
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52CHAPTER 3 ■ DATABASES AND PERLm
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54CHAPTER 3 ■ DATABASES AND PERLl
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56CHAPTER 3 ■ DATABASES AND PERLc
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58CHAPTER 3 ■ DATABASES AND PERLR
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62CHAPTER 3 ■ DATABASES AND PERLw
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64CHAPTER 3 ■ DATABASES AND PERLA
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74CHAPTER 4 ■ SYSTEM INTERACTION
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76CHAPTER 4 ■ SYSTEM INTERACTIONt
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78CHAPTER 4 ■ SYSTEM INTERACTIONc
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80CHAPTER 4 ■ SYSTEM INTERACTIONA
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82CHAPTER 4 ■ SYSTEM INTERACTIONm
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Page 122 and 123: 108CHAPTER 6 ■ NET:: TOOLSCreatin
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Page 126 and 127: 112CHAPTER 6 ■ NET:: TOOLSmy $pop
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Page 130 and 131: 116CHAPTER 6 ■ NET:: TOOLS($messa
Page 132 and 133: 118CHAPTER 6 ■ NET:: TOOLSListing
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Page 148 and 149: PART 3■ ■ ■XML and RSS
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Page 192 and 193: PART 4■ ■ ■PerformanceEnhance
Page 194 and 195: 184CHAPTER 10 ■ APACHE AND MOD_PE
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190CHAPTER 10 ■ APACHE AND MOD_PE
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202CHAPTER 11 ■ DEVELOPMENT WITH
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CHAPTER 12■ ■ ■The Template T
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CHAPTER 12 ■ THE TEMPLATE TOOLKIT
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CHAPTER 13■ ■ ■Perl Web Sites
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CHAPTER 13 ■ PERL WEB SITES WITH
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284APPENDIX ■ PERL BASICSKeywords
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286APPENDIX ■ PERL BASICS$ perl n
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288APPENDIX ■ PERL BASICSAnd line
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290APPENDIX ■ PERL BASICSCan you
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292APPENDIX ■ PERL BASICSBy defau
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294APPENDIX ■ PERL BASICS#!/usr/b
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296APPENDIX ■ PERL BASICSThe last
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298APPENDIX ■ PERL BASICSThe NOT
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300APPENDIX ■ PERL BASICSprint "S
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302APPENDIX ■ PERL BASICSthe syst
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304APPENDIX ■ PERL BASICS$ perl s
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306APPENDIX ■ PERL BASICSThis cod
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308APPENDIX ■ PERL BASICS$a = 6 *
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310APPENDIX ■ PERL BASICS$a = "A9
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312APPENDIX ■ PERL BASICS#!/usr/b
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314APPENDIX ■ PERL BASICSmy $name
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316APPENDIX ■ PERL BASICSis short
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330APPENDIX ■ PERL BASICSuntil ($
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332APPENDIX ■ PERL BASICSuse stri
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334APPENDIX ■ PERL BASICSdoneAll
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336APPENDIX ■ PERL BASICS$ perl r
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338APPENDIX ■ PERL BASICSSummaryT
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340■INDEXmethods for retrieving r
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342■INDEXdo() method for, 62dumpi
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344■INDEXhello option for Net::SM
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346■INDEXNet::DNS module, 125-128
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348■INDEXrecord with Net::DNS mod
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350■INDEXstoring mail server in e
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352■INDEXlogging based on, 229pri
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