archiva fails to serve maven2 plugin from legacy repository

Archiva is configured to proxy http://dist.codehaus.org/ (legacy layout)

the xdoclet2 maven2 plugin is deployed under /xdoclet/maven-plugins. This looks right as the type is set to "maven-plugin".

trying to download http://archiva/repository/maven/xdoclet/maven2-xdoclet2-plugin/2.0.5/maven2-xdoclet2-plugin-2.0.5.jar fails
archiva has no info from the specified URL about trying to get a maven-plugin !
http://archiva/repository/maven/xdoclet/maven2-xdoclet2-plugin/2.0.5/maven2-xdoclet2-plugin-2.0.5.maven-plugin works as expected.

2 options (suggestions are wecome) :

• use a "-plugin" pattern that a plugin is required (just a hack, and requires all plugin to follow this convention)
• read the requested artifact POM to get the artifact type.