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As a seasoned developer, you probably realize users will make mistakes. What s particularly daunting is the range of possible mistakes that users can make. Here are some common examples: Users might ignore an important field and leave it blank. Users might try to type a short string of nonsense to circumvent a required field check, thereby creating endless headaches on your end. For example, you might get stuck with an invalid e-mail address that causes problems for your automatic e-mailing program. Users might make an honest mistake, such as entering a typing error, entering a nonnumeric character in a number field, or submitting the wrong type of information. They might even enter several pieces of information that are individually correct but when taken together are inconsistent (for example, entering a MasterCard number after choosing Visa as the payment type). Malicious users might try to exploit a weakness in your code by entering carefully structured wrong values. For example, they might attempt to cause a specific error that will reveal sensitive information. A more dramatic example of this technique is the SQL injection attack, where user-supplied values change the operation of a dynamically constructed database command. (Of course, validation is no defense for poor coding. When you consider database programming in 15, you ll learn how to use parameterized commands, which avoid the danger of SQL injection attacks altogether.)

s Caution A lot of what is discussed in this chapter will depend on how you configure your web server. If the localhost is accessed by typing http://localhost:8888 or some other address, make sure you substitute my instructions with the appropriate settings. You should be versed in localhost setups before launching Cake, especially since so many variations of localhost setups exist that I won t discuss in detail here.

Tip If you decide to use application state, you can initialize its contents when your application first starts.

For example, =POWER(5,3) returns 125 (which is 5 cubed, or 5 raised to the third power) Note that this is the same as typing =5^3..

Just add the initialization code to the Global.asax file in a method named Application_OnStart(), as described in 5.

Each state management choice has a different lifetime, scope, performance overhead, and level of support. Table 7-3 and Table 7-4 show an at-a-glance comparison of your state management options.

There may not be the necessary file permissions in place. If this error occurs, you may see a blank screen or a 403 error. The 403 HTTP server error occurs when the server denies access to whatever is being requested by the user. Several settings, file permissions, or PHP configuration bugs could trigger the 403 error. To fix this, set the first_app folder permissions to 0755

Table 7-3. State Management Options Compared (Part 1)

Allowed Data Types Storage Location All serializable .NET data types. A hidden field in the current web page.

String data. The client s computer (in memory or a small text file, depending on its lifetime settings). Set by the programmer. Can be used in multiple pages and can persist between visits. The whole ASP.NET application. Insecure, and can be modified by the user.

Figure 8-1 The Ajax flow for submitting a comment asynchronously This figure looks almost identical to a typical flow in Cake But it does differ in a couple of important ways: 1 When the form is submitted to the controller in this step, it is done using the Ajax helper This means that the form data is collected by a JavaScript function and passed to the controller without changing the state of the browser 2 The controller handles the form data as it would a typical response It sends data to be saved to the model and checks for invalidations 3 The model saves the data in the database and returns a successful response 4 Rather than display the view normally, the controller uses the render() function to pass the output along as an Ajax response.

Lost when the user enters a new URL or closes the browser. However, this can be stored in a bookmark. Limited to the target page. Clearly visible and easy for the user to modify.