The Client Tier

At the client level we have either a Java client application or a web browser as the client.  By using a web browser as the client allows the entire application to be located on the server.  The client always gets the latest version when they start the application.  Also the client can use any web browser from any location provided that they can connect to the application server.  The client tier can also consist of an application running on the clients desktop (usually presenting a rich user interface) and connecting directly or through HTTP to the application server.  This requires that the client have the application installed on their desktop.

The Web Tier

At the web server layer we see two important components, the Oracle HTTP Server (OHS) and web cache component (Figure 1.6).  This tier is responsible for managing incoming HTTP requests, caching web messages, and sending XML and HTML back to the client. 

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