encoding parameters when acting as WMS client

[Nuno Gil]

Dear listers,

When Mapserver acts as a WMS client, the request that it sends to the
cascaded WMS server has some encoded parameters (like the "layer"
parameter).
I am trying to get a layer named "test/test1" - yes, with the forward
slash included. Mapserver translates the forward slash and the
cascaded server cannot find the requested layer.
Is there a way (perhaps with a script) to edit on-the-fly all the
requests MapServer sends to the  server being cascaded? In this way I
would try to unencode the forward slash before sending the request.

Regards,
Nuno