Additional Arguments
callback
--callback is an optional argument which POSTs JSON data that has
the status of the test, at the end of the test to the given URL. The
URL should be a valid http(s) link that accepts POST data.
--callback is an optional argument which POSTs JSON data that has
the status of the test, at the end of the test to the given URL. The
URL should be a valid http(s) link that accepts POST data.