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NET uses different values of the RequestID parameter sent either in the query string of an HTTP GET verb or the parameters of an HTTP POST verb This is useful for pages like ViewUseraspx in the Friends Reunion application The exact content of this page varies from user to user, and so there would be no value in caching a single version of the page for all users So, you can have the application differentiate between individual users by checking the value of the RequestID parameter; and by placing VaryByParam="RequestID" in the OutputCache directive of the page, you can have ASP NET cache a different version of the page for each user If you don t want to cache different versions of the page based on the value of a parameter, just set VaryByParam to none: <%@ OutputCache Duration="3600" VaryByParam="none" %> You can also ask ASP .

One of the trickiest issues that new developers face when working with Spring MVC is handling Lists of objects in their command bean It becomes an issue when a form attempts to render an element of the List that hasn t been populated with items The trick is to ensure that a List contains all of the items before you display their properties To do this effectively requires a slight extension to SimpleFormController plus two more submit buttons We ll begin by looking at the XHTML required for handling Lists, and then move on to the controller itself As you learned in the previous section, the form fields are bound to properties on the command bean Of course, for this to work, the command bean must not be null, although the raw property values themselves can be null.

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pages. This is almost like giving your posts a second chance at being listed. The search engine sees a condensed view of your posts in each category.

NET to cache a version of the page for every possible combination of parameters To do this, set VaryByParam to *; like this: <%@ OutputCache Duration="3600" VaryByParam="*" %>.

WordPress allows you to generate permalinks (permanent URIs) on your blog, which appear as though each of your posts is an individual static page on your site, rather than the dynamic output of a database-driven web site. Instead of a URI to one of your stories looking like http:// example.com/ p=29, WordPress can use something like this link: http://example.com/card-games/how-to-win-at-poker/ Because this type of URI is already loaded with your keywords, it has an immediate advantage over the p=29 version. It also is more readable to your human visitors. It s easier for them to remember the link or to read it out over the phone. To configure the structure of your permalink, from the administration pages, click Options, then Permalinks. The Edit Permalink Structure page allows you to configure the structure of your permalink URIs, as shown in Figure 15-25.

Caution It s tempting to set VaryByParam to *, and hence to cache every possible version of the page. At first glance, this seems like a good idea for improving overall performance. However, the cache is itself just a memory store of finite size, so the more output you choose to cache, the sooner the cache will fill up. Generally, a more selective approach is required; it s really only worth caching pages that are frequently accessed or whose generation is expensive. There is little sense in caching pages that are almost never accessed or simple pages that don t require any computation.

This is because the command bean is constantly queried for the property value, through calls such as membergetSex() Slightly more complicated is the membergetName() example We know that Name is a nested object with both first and last properties When binding to a form, we need to reference the first property, through membergetName()getFirst() As you can see, neither member nor name can be null in this context; otherwise, there will be a NullPointerException when getFirst() is called Therefore, all objects up to but not including the last property must never be null Spring MVC will not simply create an object on the fly for you to replace a null instance When handling Lists, you must be aware of what can be null and what can t be null The List itself must not be null, and the object inside the List must not be null.

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