POST
/
X-Amz-Algorithm=AWS4-ECDSA-P256-SHA256&X-Amz-Credential=AKIDEXAMPLE%2F20150830%2Fservice%2Faws4_request&X-Amz-Date=20150830T123600Z&X-Amz-Expires=3600&X-Amz-Region-Set=us-east-1&X-Amz-SignedHeaders=content-length%3Bcontent-type%3Bhost
content-length:13
content-type:application/x-www-form-urlencoded; charset=utf-8
host:example.amazonaws.com

content-length;content-type;host
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855