command line tool to generate signature-v4
signature-v4 -access SXO8VW2OFKKP2OG7AC85 -secret CKWSSgrUgvfUMTaNBkB63exet4WW+uNhQvi91Bc3 '{"method":"GET","path":"/","query":"","header":{"Accept-Encoding":["gzip"],"Host":["192.168.1.5:9000"],"X-Amz-Content-Sha256":["e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"],"X-Amz-Date":["20160919T214602Z"]}}'