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In the preceding chapter, you saw that a constructor executes code that prepares a class for use. This includes initializing both the static and instance members of the class. In this chapter, you saw that part of a derived class object is an object of the base class. To create the base class part of an object, a constructor for the base class is called as part of the process of creating the instance. Each class in the inheritance hierarchy chain executes its base class constructor before it executes its own constructor body. For example, the following code shows a declaration of class MyDerivedClass and its constructor. When the constructor is called, it calls the parameterless constructor MyBaseClass() before executing its own body. class MyDerivedClass : MyBaseClass { MyDerivedClass() // Constructor uses base constructor MyBaseClass(). { ... } The order of construction is shown in Figure 7-11. When an instance is being created, one of the first things that is done is the initialization of all the instance members of the object. After that, the base class constructor is called. Only then is the body of the constructor of the class itself executed.

Now that we have a breakpoint set, let s debug the code by going back to the test harness running in Internet Explorer and again typing

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A perpetual problem with cookies is that web site designers do not seem to realize that cookies need to be protected as zealously as your username and password While it is true that well-designed cookies expire and will no longer be accepted as valid by the server, cookies while they last give exactly as much access to a web site as a username and password If someone can make requests to a site with your login cookie, the site will think it is you who has just logged in Some sites do not protect cookies at all: they might require HTTPS for your username and password, but then return you to normal HTTP for the rest of your session And with every HTTP request, your session cookies are transmitted in the clear for anyone to intercept and start using.

For example, in the following code, the values of MyField1 and MyField2 would be set to 5 and 0 respectively, before the base class constructor was called. class MyDerivedClass : MyBaseClass { int MyField1 = 5; int MyField2; public MyDerivedClass() { ... } } class MyBaseClass { public MyBaseClass() { ... } }

Other sites are smart enough to protect subsequent page loads with HTTPS, even after you have left the login page, but they forget that static data from the same domain, like images, decorations, CSS files, and JavaScript source code, will also carry your cookie The better alternatives are to either send all of that information over HTTPS, or to carefully serve it from a different domain or path that is outside the jurisdiction of the session cookie And despite the fact this problem has existed for years, at the time of writing it is once again back in the news with the celebrated release of Firesheep Sites need to learn that session cookies should always be marked as secure, so that browsers will not divulge them over insecure links.

Caution Calling a virtual method in a constructor is strongly discouraged. The virtual method in the base class would call the override method in the derived class while the base class constructor was being executed. But that would be before the derived constructor s body was executed. It would, therefore, be calling up into the derived class before the class was completely initialized.

Earlier generations of browsers would refuse to cache content that came in over HTTPS, and that might be where some developers got into the habit of not encrypting most of their web site But modern browsers will happily cache resources fetched over HTTPS some will even save it on disk if the Cachecontrol: header is set to public so there are no longer good reasons not to encrypt everything sent from a web site Remember: If your users really need privacy, then exposing even what images, decorations, and JavaScript they are downloading might allow an observer to guess which pages they are visiting and which actions they are taking on your site Should you happen to observe or capture a Cookie: header from an HTTP request that you observe, remember that there is no need to store it in a CookieJar or represent it as a cookielib object at all.

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