I'm getting similar problems. I can't get even the example to work. All I get are 400 Bad Request responses. The documentation is terrible.
HTTP/1.1 400 Bad Request
Content-Type: application/octet-stream
Set-Cookie: PREF=ID=558ad29c10cc682e:TM=1368137780:LM=1368137780:S=qwP4LRDxE8pq6
b-s; expires=Sat, 09-May-2015 22:16:20 GMT; path=/; domain=.
google.comX-Content-Type-Options: nosniff
Date: Thu, 09 May 2013 22:16:20 GMT
Server: HTTP server (unknown)
Content-Length: 0
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN