http://github.com/roboticboyer/Esempi_ESP8266/tree/master/DS1820_SPIFFS_Gauge
On the GET or PUT issue ... In all modern browsers the GET will work just fine, but not in Internet Explorer. When you use GET in Internet Explorer, it will retrieve data from its cache and not from the current xml-data. Using a PUT however, will force IE to refresh the data.
thank you so much