Browser Caching

The portal supports browser caching using HTTP conditional requests. You enable browser caching by setting the ALLOW_BROWSER property in the component's profile.

The following are the steps that occur if browser caching is enabled:

1. An HTTP header LastModified is sent to the browser with the last-modified time.

2. After receiving a response with a LastModified header, the browser sends an IfModified-Since header to the server if the same request is made again. The header contains the time from the LastModified header.

3. The If-Modified-Since value can be compared to the cached content timestamp of the root node.

   If they match, the HTTP response header NOT_MODIFIED is sent to the browser.

   Otherwise, the content is regenerated, stored in the cache, and sent again to the browser.

A portal component can use browser caching if:

• The root component node is cached.

• All cached nodes in the Portal Object Model (POM) have the property ALLOW_BROWSER set to Yes or BrowserOnly in their profile, as shown below:

            <component name="user2">
              <component-config>
                <property name="ClassName" value="myApp.myComponent"/>
              </component-config>
              <component-profile>
                <property name="CachingLevel" value="User"/>
                <property name="ALLOW_BROWSER" value="BrowserOnly"/>
              </component-profile>
            </component>