"The GUID for the ClientRequestID parameter in these URIs are only an example. To try the web service URIs out, generate your own GUID. The GUIDs shown in these examples may be blocked by the web service in the future."
But even with a newly generated GUID the call does NOT work in my browsers: Firefox and Chromium under Linux, nor IE under Win7 and Win8.1 - only a timeout from that site.
Am I making something wrong, or is this a problem on MS's side?