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A resource which will be supplied from an on disk cache (suitable for multiple or large files) for as long as the file on the webserver does not change.  If the webserver becomes unavailable the last used contents of the file will be returned (even if that was in a previous IdP lifetime)

<bean id="fileResource" class="net.shibboleth.ext.spring.resource.FileBackedHTTPResource"
      c:client-ref="shibboleth.FileCachingHttpClient"
      c:url="http://example.org/path/to/file.xml" 
      c:backingFile="/var/shibboleth/caches/resourcecache/file.xml"/>

<bean id="fileResource" class="net.shibboleth.ext.spring.resource.FileBackedHTTPResource"
      c:client-ref="shibboleth.FileCachingHttpClient"
      c:url="http://example.org/path/to/file.xml" 
      c:resource="/var/shibboleth/caches/resourcecache/file.xml"/>