[OpenLayers] 마우스 click시 url가져오기??

map.on('singleclick', function(evt) {
    var viewResolution = (map.getView().getResolution());
    var url = wmsSource.getFeatureInfoUrl(evt.coordinate, viewResolution, 'EPSG:5181', {'INFO_FORMAT': 'text/html'});
    if (url) {
        fetch(url)
        .then(function(response) {
            return response.text();
        })
        .then(function(data) {
            console.log(data);
        });
    }
});