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website builder website builder To have a Ruby script generate HTML output, all you need is #!/usr/bin/env ruby print "HTTP/1.0 200 OK\r\n" print "Content-type: text/html\r\n\r\n" print "<html><body>Hello World!</body></html>\r\n" You could use Ruby's regular expression features to parse incoming query strings, look up environment variables, check tags, substitute text into templates, escape special characters, format up the HTML, and print it all out. Or, you could use class CGI.Using cgi.rb Class CGI provides support for writing CGI scripts.

website builder With it, you can manipulate forms, cookies, and the environment, maintain stateful sessions, and so on. It's documented in full in the reference section beginning on page 497, but we'll take a quick look at its capabilities here. Quoting When dealing with URLs and HTML code, you must be careful to quote certain characters. For instance, a slash character (``/'') has special meaning in a URL, so it must be ``escaped'' if it's not part of the path name. That is, any ``/'' in the query portion of the URL will be translated to the string ``%2F'' and must be translated back to a ``/'' for you to use it.

website builder Space and ampersand are also special characters. To handle this, CGI provides the routines CGI.escape and CGI.unescape: require 'cgi' puts CGI.escape( "Nicholas Payton/Trumpet & Flugel Horn" ) produces: Nicholas+Payton%2FTrumpet+%26+Flugel+Horn Similarly, you may want to escape HTML special characters: require 'cgi' puts CGI.

website builder escapeHTML( '<a href="/mp3">Click Here</a>' ) produces: <a href="/mp3">Click Here</a> To get really fancy, you can decide to escape only certain elements within a string: require 'cgi' puts CGI.escapeElement('<hr><a href="/mp3">Click Here</a><br>','A') produces: <hr><a href="/mp3">Click Here</a><br> Here only the ``A'' tag is escaped; other tags are left alone. Each of these methods has an ``un-'' version to restore the original string. Forms Using class CGI gives you access to HTML query parameters in two ways. Suppose we are given a URL of /cgi-bin/lookup?player=Miles%20Davis&year=1958.

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