Hi Luis,

I had been dealing with the similar situation like you are. I had to add
SLD_BODY parameter to each dispatched WMS GetMap request, to filter and
highlight desired features....

- If you just need to modify WMS GetMap request, best place to do that is
MapPane.js source code. 
(Look at the paint method)

- Remaining WMS requests (GetFeatureInfo, GetCapabilities) are being
dispatched trough the ProxyRedirect servlet, because of the XMLHttpRequest
object security restriction...(btw good solution!)...You can modify the
requests here, if you need that.

regards Denton...;-)

 
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