[MapProxy] Black Background color with openlayer request with transparency

[Giuseppe De Marco]

Hi and good Morning,

I've played with mapproxy for about one year, i love it, but I'm never been able to getting base layer transparent or with background color different from black.
I use openlayers and I think that the way I declare Layers should be good but I can't understand why the black never changes.

This is an example of OL layer declaration:

    base_wms = new OpenLayers.Layer.WMS("Calabria_UTM33", "http://"+  wms_hostname + ":8089/service?",  
    {'layers': "Calabria_UTM33", 'transparent': "true", 'format': "image/png", 'srs':"EPSG:32633"}, {ratio: 1, isBaseLayer: true});  

And this is the resulting query

http://myhostname:8089/service?LAYERS=Calabria_UTM33&TRANSPARENT=true&FORMAT=image%2Fpng&SRS=EPSG%3A32633&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&BBOX=831598.0861244,4072000,907540.66985646,4147942.5837321&WIDTH=256&HEIGHT=256


It seems to me that the query were well made but the black remains.
I hope to avoid this with your help.
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