Error handling / external resource

[Philippe Guillard]

Hi,
Is it possible to handle error when an external resource is not available?
This is what i tried for now without success:
<map:match pattern="foo">
   <map:act type="resource-exists">
       <map:parameter name="url" value="http://www.foo.org"/>
        <map:generate type="html" src="http://www.foo.org";>
       <map:serialize type="xhtml"/> 
   </map:act>
   <map:generate src="notavailable.xml"/>
   <map:serialize type="xml"/> 
</map:match>
.....
  <map:handle-errors>
   <map:transform src="common/style/xsl/html/error2html.xsl"/>
   <map:serialize type="html" status-code="500"/>
  </map:handle-errors>   

Regards,
Phil

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