With GeoServer you can use buffer in vendorParams when making the Control:
var yourControl = new OpenLayers.Control.WMSGetFeatureInfo({
url: '/geoserver/wms',
title: 'Identify features by clicking',
queryVisible: true,
layers: [ layer1, layer2, layer3 ],
vendorParams: {
buffer: 10 // geoserver buffer in pixels
},
eventListeners: { // stuff }
});
--
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