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Perl has become increasingly popular for the dynamic delivery of World Wide Web content, and in doing so has put to good use the Common Gateway Interface (CGI), the standard interface to allow external programs to work with a web server. There are several reasons for Perl s success, the main one being that it gets the job done quickly and efficiently, which is due to its suitability for text processing and its large library of modules. The most important module for programming for the CGI is the appropriately named CGI module, written by Lincoln Stein. This module is part of the standard distribution of Perl. Delivering dynamic content on the Web is becoming increasingly important in the world today where every business is expected to have an interface for its customers via the Web. Interfaces to product and other databases, shopping carts, customer information and documents are becoming more and more commonplace. Some of these interactive interfaces can benefit from having a graphical component that is also dynamic in nature. In this chapter we ll see how to create and deliver dynamic graphics content for a World Wide Web interface, as well as ways to prepare static Web content with Perl. 90

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4. ClickOnce actually compares the hash of the data files in both data directories with what is listed for each file in the newer version s application manifest.

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There is very little reason to write a CGI program in Perl that does not use the CGI module. The most frequently quoted reason is that it takes a considerable amount of CPU time to compile this module, or that a script is so trivial that using all the power of CGI is overkill. That might be true, but I have rarely seen a program that remains trivial for long. Sooner or later, more and more parts of the CGI interface need to be implemented, each step running the risk of introducing bugs bugs that wouldn t exist if the CGI module had been used. If it s still felt that compiling the module for each invocation of a Perl program is too much load on the machine, use the Apache server and the mod_perl plug-in, or any server with FastCGI and the CGI::Fast module instead of CGI. You could take a look at one of the smaller modules like CGI::Lite; however, one good reason to prefer the CGI module is that it s part of the standard Perl distribution. Anywhere a reasonably recent Perl is installed, this module will be available. Code that uses CGI is easily portable, unless other parts of the program make it hard to port. Of course, writing your own code to work in the CGI environment will be as portable as you make it. If you still think that you do not want to use any of these modules, you can point your web browser to the documentation section at http://www.cgiresources.com and read about the CGI interface.

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Something important to understand about HTTP is that each object that is fetched from the server is a separate request. Often HTTP and HTML are confused, and people only familiar with HTML believe, erroneously, that the HTTP protocol somehow magically knows what the contents of an HTML document are. This is not the case. When an HTML document is being served to a browser, and this document contains 4 graphics files, then the browser will make 5 separate requests to the server.1 To our human eye it might look like one single page, but as far as the HTTP server is concerned, there is no link between the 5 pieces of information it just served. Consequently, your CGI programs need to deal with each of these requests separately. You can t write a program that at once delivers both the HTML document and the images referenced in that document. It will need to do so in multiple runs, the difference in output triggered by parameters, or you need to provide multiple programs. It is vitally important to understand this before attempting to write complex CGI programs.

Axes fall into two groups based on the direction in which the XSLT processor goes when it traverses the tree: forward axes (indicated by an F in the table) and reverse axes (indicated by an R in the table).

This does not mean that it always needs to open a connection to the server 5 times. Nowadays, multiple HTTP requests can be sent in a single connection.

1 document 2 processing instruction: xml-stylesheet type="text/xsl" href="TVGuide.xsl" element: {http://www.example.com/TVGuide}TVGuide attribute: start 2001-07-05 attribute: end 2001-07-05 4 3

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