POST / http/1.1
DATE:Mon, 09 Sep 2011 23:36:00 GMT
host:host.foo.com
zoo:ZOOBAR
Authorization: AWS4-HMAC-SHA256 Credential=AKIDEXAMPLE/20110909/us-east-1/host/aws4_request, SignedHeaders=date;host;zoo, Signature=273313af9d0c265c531e11db70bbd653f3ba074c1009239e8559d3987039cad7

