POST
/
X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIDEXAMPLE%2F20150830%2Fus-east-1%2Fservice%2Faws4_request&X-Amz-Date=20150830T123600Z&X-Amz-Expires=3600&X-Amz-SignedHeaders=content-length%3Bhost%3Bx-amz-content-sha256
content-length:13
host:example.amazonaws.com
x-amz-content-sha256:UNSIGNED-PAYLOAD

content-length;host;x-amz-content-sha256
UNSIGNED-PAYLOAD