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

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CHAPTER 5 ■ LWP MODULES 95When called in a list context, the head() function returns five items from the response header:• Content type• Document length• Modified time• Expires• ServerFor example, the head() function might be called in this manner in order to capture thefive values:($content_type,$doclen,$modified,$expires,$server) = \head('http://www.braingia.org');The Mirror FunctionThe mirror() function works in much the same was as the getstore() function, but alsoincludes a check to compare the modification time of the local file and the modificationtime of the remote resource, based on the If-Modified-Since response header. Listing 5-3shows an example of the mirror() function in action (Example3.pl):Listing 5-3. Using the mirror() Function#!/usr/bin/perl -wuse LWP::Simple;use strict;my $url = "http://www.braingia.org/";my $file = "/tmp/braingiamirrorweb";my $status = mirror($url,$file);die "Cannot retrieve $url" unless is_success($status);This program won’t produce any output to the terminal unless there is an error. If it’s successful,there will be a file in /tmp called braingiamirrorweb. Inside that file will be raw outputsuch as HTML and other bits as found on the web page. The contents will be similar to thefollowing:
96CHAPTER 5 ■ LWP MODULES
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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 1 ■ THE CGI MODULE 7Obvio
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CHAPTER 1 ■ THE CGI MODULE 9exit;
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CHAPTER 1 ■ THE CGI MODULE 11Each
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CHAPTER 1 ■ THE CGI MODULE 13When
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CHAPTER 1 ■ THE CGI MODULE 15Upda
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CHAPTER 1 ■ THE CGI MODULE 17rese
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CHAPTER 1 ■ THE CGI MODULE 19prin
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CHAPTER 1 ■ THE CGI MODULE 21Sett
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CHAPTER 1 ■ THE CGI MODULE 23You
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CHAPTER 1 ■ THE CGI MODULE 25■C
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CHAPTER 1 ■ THE CGI MODULE 27No m
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CHAPTER 1 ■ THE CGI MODULE 29The
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CHAPTER 1 ■ THE CGI MODULE 31prin
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CHAPTER 1 ■ THE CGI MODULE 33Also
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CHAPTER 2■ ■ ■Popular CGI Mod
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CHAPTER 2 ■ POPULAR CGI MODULES 3
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Page 60 and 61: CHAPTER 2 ■ POPULAR CGI MODULES 4
Page 66 and 67: 50CHAPTER 3 ■ DATABASES AND PERLT
Page 68 and 69: 52CHAPTER 3 ■ DATABASES AND PERLm
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Page 74 and 75: 58CHAPTER 3 ■ DATABASES AND PERLR
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Page 90 and 91: 74CHAPTER 4 ■ SYSTEM INTERACTION
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Page 100 and 101: 84CHAPTER 4 ■ SYSTEM INTERACTIONs
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Page 104 and 105: CHAPTER 5■ ■ ■LWP ModulesLWP
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Page 108 and 109: CHAPTER 5 ■ LWP MODULES 93Get Fun
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Page 118 and 119: CHAPTER 5 ■ LWP MODULES 103For th
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Page 122 and 123: 108CHAPTER 6 ■ NET:: TOOLSCreatin
Page 124 and 125: 110CHAPTER 6 ■ NET:: TOOLSThe out
Page 126 and 127: 112CHAPTER 6 ■ NET:: TOOLSmy $pop
Page 128 and 129: 114CHAPTER 6 ■ NET:: TOOLSthe POP
Page 130 and 131: 116CHAPTER 6 ■ NET:: TOOLS($messa
Page 132 and 133: 118CHAPTER 6 ■ NET:: TOOLSListing
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Page 136 and 137: 122CHAPTER 6 ■ NET:: TOOLSNet::SM
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Page 142 and 143: 128CHAPTER 6 ■ NET:: TOOLSListing
Page 144 and 145: 130CHAPTER 6 ■ NET:: TOOLSFor exa
Page 146 and 147: 132CHAPTER 6 ■ NET:: TOOLSSending
Page 148 and 149: PART 3■ ■ ■XML and RSS
Page 150 and 151: 138CHAPTER 7 ■ SOAP-BASED WEB SER
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148CHAPTER 7 ■ SOAP-BASED WEB SER
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154CHAPTER 8 ■ PERL AND RSSFigure
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156CHAPTER 8 ■ PERL AND RSShttp:/
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158CHAPTER 8 ■ PERL AND RSSDebugg
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160CHAPTER 8 ■ PERL AND RSS$rsswr
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162CHAPTER 8 ■ PERL AND RSSListin
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CHAPTER 9■ ■ ■XML Parsing wit
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CHAPTER 9 ■ XML PARSING WITH PERL
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PART 4■ ■ ■PerformanceEnhance
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184CHAPTER 10 ■ APACHE AND MOD_PE
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202CHAPTER 11 ■ DEVELOPMENT WITH
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CHAPTER 12■ ■ ■The Template T
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CHAPTER 12 ■ THE TEMPLATE TOOLKIT
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CHAPTER 13■ ■ ■Perl Web Sites
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CHAPTER 13 ■ PERL WEB SITES WITH
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284APPENDIX ■ PERL BASICSKeywords
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286APPENDIX ■ PERL BASICS$ 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 $name
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316APPENDIX ■ PERL BASICSis short
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318APPENDIX ■ PERL BASICSLet’s
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320APPENDIX ■ PERL BASICSOther Te
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322APPENDIX ■ PERL BASICS}}}actio
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324APPENDIX ■ PERL BASICSNotice t
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326APPENDIX ■ PERL BASICSLooping
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328APPENDIX ■ PERL BASICSuse stri
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330APPENDIX ■ PERL BASICSuntil ($
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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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