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It is generally not a good idea to use the HTTP Expiration model, but to use the second way of way is called the HTTP Validation model. To understand why the HTTP Expiration model is problematic, consider the following scenario. You are running a website hosting news. So that there is less traffic on the website, you enable HTTP caching and assign an expiry of 30 minutes. (The expiry time is an arbitrary value used for illustrative purposes.) This means that when a browser downloads some content, the next version of the content will be available in 30 minutes. Indicating a wait period of 30 minutes is a bad idea because in that 30 minutes news can dramatically change. A client who has downloaded some content is then restricted to retrieving news in 30-minute cycles. Of course the client could ignore or empty the cache, resulting in downloads of the latest information. If the client always empties the cache, the client will always get the latest news, but at a cost of downloading content that may not have changed. The resource cost should not surprise anyone because always getting the latest content means using no caching whatsoever. Scripts such as Java servlets/JSP or ASP.NET pages very often use this strategy, and the administrator managing the website wonders why there are performance problems.

In this code example the toolkit is saying that when the onload event is called, use my functionality. The second toolkit interested in the onload event would assign window.onload to the following: window.onload = function() { // initialize toolkit 2 } The second assignment would work, but it begs the question, what happens to the initialization of toolkit 1 The answer is that it is not called. Toolkits 1 and 2 are fighting for the attention of the onload event, and the winner is whichever toolkit assigns the onload event last. There are three potential solutions to this dilemma: Convert the toolkits to use browser-specific tags that will allow them to reference multiple onload functions. The downside of this solution is that you need to write browser-specific code, which increases the maintenance cost of the code. Use a function that calls both initializations. The downside is that you need to provide a function that manages both initializations. Convert the toolkits to play nicely with each other and not overwrite the other initialization. The downside is that the toolkits have to figure out how to call the other initialization routines.

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10 In the Solution Explorer, right-click the project IEWebControls and select Add New Folder from the context menu 11 Name the new folder Resources 12 Right-click the Resources folder and select Add Add Existing Item from the context menu 13 In the Add Existing Item dialog, navigate to the folder \Program Files\IE Web Controls\ src\Resources 14 In the Files of Type list, select All Files to reveal the resource files located in the directory 15 Select all files in this directory that have either a bmp or resources extension and click the Open button to add them to the project 16 In the Solution Explorer, right-click the project IEWebControls and select Add New Folder from the context menu 17 Name the new folder Design 18 Right-click the Design folder and select Add Add Existing Item from the context menu 19.

The better approach is to use the HTTP Validation model. This model sends each response with a ticket that references the uniqueness of the data. If the client wants to download the content again, the client sends the server a ticket from the last download. The server compares the sent ticket with the ticket that it has; if the server notices the tickets are identical, it sends an HTTP 304 to indicate no changes have occurred. At that point, the client can retrieve the old content from the cache and present it to the user as the latest and greatest. The HTTP Validation

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