POST / http/1.1 Content-Type:application/x-www-form-urlencoded Date:Mon, 09 Sep 2011 23:36:00 GMT Host:host.foo.com Authorization: AWS4-HMAC-SHA256 Credential=AKIDEXAMPLE/20110909/us-east-1/host/aws4_request, SignedHeaders=content-type;date;host, Signature=5a15b22cf462f047318703b92e6f4f38884e4a7ab7b1d6426ca46a8bd1c26cbc foo=bar