proxy cache configuration reference

Proxy Cache Configuration Reference

<cache-mapping>

<cache>

<cache-mapping>

child of web-app

<cache-mapping> specifies max-age and Expires times for cacheable pages.

See caching for more information.

<cache-mapping> is intended to provide Expires times for pages that have ETags or Last-Modified specified, but do not wish to hard-code the max-age timeout in the servlet. For example, Resin's FileServlet relies on cache-mapping to set the expires times for static pages. Using cache-mapping lets cacheable pages be configured in a standard manner.

<cache-mapping> does not automatically make pages cacheable. Your servlets must already set the ETag (or Last-Modified) header to activate <cache-mapping>.

cache-mapping requires an enabled <cache>. If the cache is disabled, cache-mapping will be ignored.
cache-mapping does not automatically make a page cacheable. Only cacheable pages are affected by cache-mapping, i.e. pages with an ETag or Last-Modified.

The time intervals default to seconds, but will allow other time intervals.

<cache-mapping> Attributes
ATTRIBUTE	DESCRIPTION	DEFAULT
expires	A time interval to be used for the HTTP Expires header.
max-age	A time interval to be used for the "Cache-Control max-age=xxx" header. max-age affects proxies and browsers.
s-max-age	A time interval to be used for the "Cache-Control s-max-age=xxx" header. s-max-age affects proxy caches (including Resin), but not browsers.
url-pattern	A pattern matching the url:/foo/, /foo, or .foo
url-regexp	A regular expression matching the url

<cache-mapping> schema

element cache-mapping {
  (url-pattern | url-regexp)
  & expires?
  & max-age?
  & s-max-age?
}

Example: cache-mapping in resin-web.xml

<web-app xmlns="http://caucho.com/ns/resin">

  <cache-mapping url-pattern='/*'
                 max-age='10'/>

  <cache-mapping url-pattern='*.gif'
                 max-age='15m'/>

</web-app>

<cache>

child of cluster

<cache> configures the proxy cache (requires Resin Professional). The proxy cache improves performance by caching the output of servlets, jsp and php pages. For database-heavy pages, this caching can improve performance and reduce database load by several orders of magnitude.

The proxy cache uses a combination of a memory cache and a disk-based cache to save large amounts of data with little overhead.

Management of the proxy cache uses the ProxyCacheMXBean.

<cache> Attributes
ATTRIBUTE	DESCRIPTION	DEFAULT
path	Path to the persistent cache files.	cache/
disk-size	Maximum size of the cache saved on disk.	1024M
enable	Enables the proxy cache.	true
enable-range	Enables support for the HTTP Range header.	true
entries	Maximum number of pages stored in the cache.	8192
max-entry-size	Largest page size allowed in the cache.	1M
memory-size	Maximum heap memory used to cache blocks.	8M
rewrite-vary-as-private	Rewrite Vary headers as Cache-Control: private to avoid browser and proxy-cache bugs (particularly IE).	false

<cache> schema

element cache {
  disk-size?
  & enable?
  & enable-range?
  & entries?
  & path?
  & max-entry-size?
  & memory-size?
  & rewrite-vary-as-private?
}

Example: enabling proxy cache

<resin xmlns="http://caucho.com/ns/resin">
    <cluster id="web-tier">
        <cache entries="16384" disk-size="2G" memory-size="256M"/>

        <server id="a" address="192.168.0.10"/>

        <host host-name="www.foo.com">
    </cluster>
</resin>