fixed request handeling

OWS.py

@@ -264,7 +264,7 @@ class OWS:
         """ Set WFS filter encoding 
         """
         logging.debug("Setting filter for layer %s to %s" % (request.getValueByName("layers"),request.getValueByName("fes")))
-        layerobj = mapobj.getLayerByName(request["layers"])
+        layerobj = mapobj.getLayerByName(request.getValueByName("layers"))
         layerobj.setMetaData("wfs_filter",request.getValueByName("fes"))
 
 def getService():