POST /?f oo=b ar http/1.1
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=date;host, Signature=b7eb653abe5f846e7eee4d1dba33b15419dc424aaf215d49b1240732b10cc4ca