POST / http/1.1
DATE:Mon, 09 Sep 2011 23:36:00 GMT
host:host.foo.com
p:z
p:a
p:p
p:a
Authorization: AWS4-HMAC-SHA256 Credential=AKIDEXAMPLE/20110909/us-east-1/host/aws4_request, SignedHeaders=date;host;p, Signature=d2973954263943b11624a11d1c963ca81fb274169c7868b2858c04f083199e3d