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Perl module P407
State and Cookies
Exercises, examples and other material relating to training module P407. This topic is presented on public course Using Perl on the Web
Each time you submit a form to a web server using CGI, you start a new program with new variables, and when the server has sent you back its response, that program exits, with a loss of all data in memory. That's fine for a one-screen application, but in practise you'll want to string together a series of forms to make up a shopping application, a bulletin board, or another application. To do this, you'll need to "maitain state" and there are various ways of doing this, which this important module studies. Related technical and longer articles Handling Cookies through CGI.pm
Examples from our training material
Pictures Maintaining State
A study in concentration Background information
Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from [here].
Topics covered in this module
The need for non-transient data.
Multiple users. Schemes for maintaining state. Which scheme should I use?. Central database example. Our database server. Planning our application. How it fits together - entry to the site. The next page. Modules used. Persistent cookies. Shopping cart using hidden fields - example. Shopping cart using cookie - example. Templating system. Security considerations for server side applications. 1. Tainting. 2. Regular expressions from user. 3. validate via email. 4. Data in hidden directories. 5. Credit card info in cookies. 6. https. 7. Avoid \ etc.. 8. Temp file names. 9. Save before send. 10. tr. Complete learning
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