http_response.xml

 <sequence xmlns="http://ws.apache.org/ns/synapse" name="_resource_mismatch_handler_">
   <payloadFactory>
      <format>
         <tp:fault xmlns:tp="http://test.com">
            <tp:code>404</tp:code>
            <tp:type>Status report</tp:type>
            <tp:message>Not Found</tp:message>
            <tp:description>The requested resource (/$1) is not available.</tp:description>
         </tp:fault>
      </format>
      <args>
         <arg xmlns:ns="http://org.apache.synapse/xsd" expression="$axis2:REST_URL_POSTFIX"/>
      </args>
   </payloadFactory>
   <property name="RESPONSE" value="true" scope="default"/>
   <property name="NO_ENTITY_BODY" action="remove" scope="axis2"/>
   <property name="HTTP_SC" value="404" scope="axis2"/>
   <header name="To" action="remove"/>
   <send/>
   <drop/>
</sequence>