[OpenLayers-Users] Strategy.Fixed with Parameters Problem

[matth1as]

Hi, I have the following Problem: I have a Vector Layer with Strategy Fixed,
Protocol HTTP along with some Parameters which are returned by a function:

var opts = {
 projection: map.displayProjection,
 strategies: [new OpenLayers.Strategy.Fixed()],
 protocol: new OpenLayers.Protocol.HTTP({
 url: "nodes.gojson.php",
 format: new OpenLayers.Format.GeoJSON({}),
 params: {'day':getSelectedDay(), 'month':getSelectedMonth(),
'year':getSelectedYear()},
 readWithPOST:true
 })
 };
sundials = new OpenLayers.Layer.Vector("KML", opts);

This works as expected, the POST request contains the parameters (e.g.
day=1, month=2, year=2011).

A few seconds later, I change day=10,month=12,year=2012 and call
sundials.refresh() to refresh the vector layer.

But here is the Problem, the new request contains the old values (1,2,2011)
?!

Is there a way to get the params updated?!

thanks

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