GzipFilter

The GzipFilter compresses the output of pages for browsers which understand compression.

<web-app> <filter-mapping url-pattern='/*' filter-name='com.caucho.http.filter.GzipFilter'/> </web-app>

use-vary	Uses the standard Vary header for Accept-Encoding	true
no-cache	Sets the Cache-Control: no-cache header	false

TransactionFilter

The TransactionFilter wraps the request in a UserTransaction and commits the transaction when the servlet completes.

<web-app> <filter-mapping url-pattern='/DatabaseServlet/*' filter-name='com.caucho.http.filter.TransactionFilter'/> </web-app>

ExpiresFilter

The ExpiresFilter sets the Expires cache control header, allowing the servlet output to be cached for a short time.

<web-app>
  <filter-mapping servlet-name='StockQuoteServlet'
                  filter-name='com.caucho.http.filter.ExpiresFilter'>
    <init-param cache-time="60s"/>
  </filter-mapping>
</web-app>

AnonymousExpiresFilter

The AnonymousExpiresFilter caches output for anonymous, i.e. non-logged in users. When a page has custom formatting for logged in users, it may still want to cache the results for non-logged in users saving time and database access.

<web-app>
  <filter-mapping url-pattern='*.jsp'
                  filter-name='com.caucho.http.filter.AnonymousExpiresFilter'>
    <init-param cache-time="15m"/>
  </filter-mapping>
</web-app>

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