Eclipse has a built-in browser window that opens when the server is started, but you can use any external browser to enter the URLs.
In your browser, enter the following URLs:
http://localhost:8080/TemperatureConverterPrj/RestApp1/getCelsius?fahrenheit=212
http://localhost:8080/TemperatureConverterPrj/RestApp1/getFahrenheit?celsius=36.8
Depending on your browser, the results are either returned in the browser or you are prompted to save the results to a text file.