ProxyPass URL with variable

[zwick69]

Hi everybody
does anyone know how I can pass variables in the ProxyPass URL ? This
is what I mean :

ProxyPass /xyz http://www.abc.org/123/WebDir?dir=1

No syntax error is given and httpd can be restarted, but /xyz is passed
to "/" instead of the specifed URL, and I think it's because of the variable
at the end. Does anybody know how ti fix the problem? Thanks a lot
zwick69