POST / http/1.1
DATE:Mon, 09 Sep 2011 23:36:00 GMT
host:host.foo.com
ZOO:zoobar
zoo:foobar
zoo:zoobar
Authorization: AWS4-HMAC-SHA256 Credential=AKIDEXAMPLE/20110909/us-east-1/host/aws4_request, SignedHeaders=date;host;zoo, Signature=54afcaaf45b331f81cd2edb974f7b824ff4dd594cbbaa945ed636b48477368ed

