POST
/
Param1=value1
content-type:application/x-www-form-urlencoded; charset=utf-8
host:example.amazonaws.com
x-amz-date:20150830T123600Z

content-type;host;x-amz-date
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855