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Here is an example of how to use it, assuming that you’ve saved it as a component called /url. This component provides a programmatic interface to URL generation. The application could retrieve the session id from incoming requests by using a mod_perl handler during the URL translation stage of request handling. If you didn’t want to put the session ID in the query string, then you might instead make it part of the URL path. My $url = shift return $url if $url =~ m = ref $value eq 'HASH' ? : $value The add_session_id() subroutine, which should be defined in a module, might look something like this: The first would be to put a filter in your top level autohandler component: Using Mason, this isn’t as difficult as it would be otherwise. Putting the session ID in the URL can be a hassle, because it means that you have to somehow process all the URLs you generate. The mod_perl user list archives at /?l=apache-modperl contain a number of discussions related to this topic. There are security and application problems with this approach (as well as with the user of cookies), but those are outside the scope of this article. If you cannot use cookies, then you can store the session ID in the URL.
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Typically, sessions are identified by session IDs that are stored in a cookie. If you’ve ever written a dynamic Web application, then it’s likely that you’ve used sessions to store data as the user moves through the application. All the recipes assume that you are using the latest version of Mason, which at the time of this writing is 1.15, though most of them will work untouched with older versions. It is a Perl-based system, after all!īelow you’ll find some cookbook recipes for solving a few typical Web application problems. Mason also comes with its own documentation, which can be seen online at As with any powerful and flexible system, Mason is applicable to a lot of problems, and there is always more than one way to do it. For more details, I would of course recommend Embedding Perl in HTML with Mason, written by Ken Williams and myself.
PERL READ IN MAC TEXT FILE CODE
The rest of this article assumes at least a minimal familiarity with Mason, though if you’re at all familiar with other templating systems, you’ll probably be able to grok the code we show. When Mason runs this code, the output is: Hello, World! Here is a very simple, but complete component that has both text and code: % my $planet = "World" A component is roughly equivalent to a Perl subroutine, and can contain text and/or code. Mason is based around the idea of a component. Like the first two, and unlike the latter, Mason operates by embedding Perl in text. For those (hopefully few) folks who haven’t yet heard of Mason, it is a Perl-based templating framework comparable to frameworks such as Apache::ASP, Embperl, and Template Toolkit. Mason is a powerful framework for generating dynamic text, and is especially useful when creating complex, featureful Web sites. Dave Rolsky and Ken Williams are the authors of Embedding Perl in HTML with Mason.