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
host:example.amazonaws.com

content-length;content-type;host
9095672bbd1f56dfc5b65f3e153adc8731a4a654192329106275f4c7b24d0b6e