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=b7a95a52518abbca0964a999a880429ab734f35ebbf1235bd79a5de87756dc4a