str = "http://demo2.traccar.org/api/reports/route?_dc=1529569956226&deviceId=8863&type=allEvents&from=2018-06-20T22%3A00%3A00.000Z&to=2018-06-21T22%3A00%3A00.000Z&page=1&start=0&limit=25";
I think "dc" stands for "disable cache". You can safely ignore it.
str = "http://demo2.traccar.org/api/reports/route?_dc=1529569956226&deviceId=8863&type=allEvents&from=2018-06-20T22%3A00%3A00.000Z&to=2018-06-21T22%3A00%3A00.000Z&page=1&start=0&limit=25";