By Steve Suehring
Beginning Perl internet improvement: From beginner to Professional introduces you to the area of Perl web program improvement. This publication tackles all parts the most important to constructing your first net purposes and incorporates a strong mix of real-world examples coupled with suggestion. subject matters diversity from serving and eating RSS feeds, to tracking web servers, to interfacing with electronic mail. you are going to how one can use Perl with ancillary applications like Mason and Nagios.
Though now not version-specific, this ebook is a perfect learn when you have had a few grounding in Perl fundamentals and now are looking to movement into the area of internet software improvement. writer Steve Suehring emphasizes the safety implications of Perl, drawing on years of expertise instructing readers the best way to imagine secure, stay away from universal pitfalls, and bring well-planned, safe code.
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Extra info for Beginning Web Development with Perl: From Novice to Professional
Feeding that encoded string into the uri_unescape() function can help reveal the intent of such an attack. Listing 2-5 shows an example of using uri_escape(). 41 42 CHAPTER 2 ■ POPULAR CGI MODULES Figure 2-3. An escaped string viewed through a web browser Listing 2-5. asp"; my $safestring = uri_escape($unsafestring); my $unescstring = uri_unescape($safestring); print header, start_html("Making URLs Safe Is Our Business"), p("The string that is unsafe for a URL is: $unsafestring\n"), p("When fed through the url_escape() function it becomes: $safestring\n"), p("When the escaped string is unescaped, it becomes: $unescstring\n"), end_html; exit; CHAPTER 2 ■ POPULAR CGI MODULES This code is similar to that shown in Listing 2-4.
Syntax Check In addition, you can perform a syntax check of the program without actually executing it by using the -c command-line option. cgi You’ll then receive an indication of any syntactical errors within the program. cgi syntax OK If a syntax error is found, you’ll see output indicating the error and the line where the error was found. ). cgi had compilation errors. CHAPTER 1 ■ THE CGI MODULE The Carp Module One of the most important and helpful modules available to help debug an error is the CGI::Carp module, or Carp for short.
LAMP is an abbreviation for Linux-Apache-MySQL-Perl/PHP/Python. The MySQL database portion of that acronym is of interest in this chapter. However, there’s nothing preventing you from using any other relational database with Perl, including Microsoft SQL Server. This chapter will look almost exclusively at MySQL, simply because it is so popular and well suited for web applications.