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AJAX Filter To make the most of RichFaces, you should register a Filter in your application's web.xml. The Filter recognizes multiple request types. The sequence diagram in Figure 4.3, “Request processing sequence diagram� shows the differences in processing between a regular JSF request and an AJAX request. Figure 4.3. Request processing sequence diagram In either case, the required static or dynamic resource information that your application requests is registered in the ResourceBuilder class. When a resource request is issued, the RichFaces filter checks the Resource Cache for this resource. If it is present, the resource is returned to the client. Otherwise, the filter searches for the resource among those registered in the ResourceBuilder. If the resource is registered, the RichFaces filter requests that the ResourceBuilder creates (delivers) the resource. The diagram that follows illustrates the process of requesting a resource. Figure 4.4. Resource request sequence diagram