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.The developer should be able to quicklyprototype code that uses standard input (forms, with METHOD=POST)or environmental variables such as PATH_INFOand QUERY_STRING.Debugging skills are essential.The developershould be able to match the most commonly encountered errors withlikely causes and then take appropriate action.Techniques such as using the Locationheader for redirecting another URL to the client and server-sideincludes should be standard tools in the developer's arsenal.The developer always should apply goodprogramming practice to a Web project-providing easy-to-read andwell-documented code, using subroutines to avoid redundancy (modularity),and most important, not reinventing the wheel! Surf the Net andscan the Usenet newsgroups to see how other sites have solvedsimilar problems.FootnotesThe NCSA httpd distribution includesthe handy cgi-handlers.plset of useful subroutines, available via anonymous FTP at ftp://ftp.ncsa.uiuc.edu/Web/httpd/Unix/ncsa_httpd/cgi/cgi_handlers.pl.Z.There is a similar package from Steve Brenner called cgi-lib.pl,and it is retrievable from http://www.bio.cam.ac.uk/web/cgi-lib.pl.txt.On-line documentation describingenvironment variables is at http://hoohoo.ncsa.uiuc.edu/cgi/env.html.On-line documentation describingserver-side include techniques and available variables is locatedat http://www.webtools.org/counter/ssi/step-by-step.htmland, more specific to the NCSA httpd server, http://hoohoo.ncsa.uiuc.edu/docs/tutorials/includes.html.You can find the Un-CGIpackage at http://www.hyperion.com/~koreth/uncgi.html.The Perl newsgroups-for example,comp.lang.perl.announceand comp.lang.perl.misc-havefrequent guest appearances from author Larry Wall.Lynx is available from http://www.cc.ukans.edu/and offers a browser which, if the client can live without graphics,is a quick and handy way to browse the Web.Thanks to Aleksey Shaposhnikovfor his programming labor on the Perl sockets application.Lisa Ma, Peter Cheng, Peggy Liu,and Heshy Shayovitz worked with me to create the resuméapplication in the Spring 1995 Telecommunications class, SternSchool of Business, Information Systems Department, New York University.Instructor: Professor Ajit Kambil [ Pobierz całość w formacie PDF ]
