GET / HTTP/1.1
Host:example.amazonaws.com
My-Header1:value1
  value2
     value3
X-Amz-Date:20150830T123600Z
X-Amz-Region-Set:us-east-1
Authorization:AWS4-ECDSA-P256-SHA256 Credential=AKIDEXAMPLE/20150830/service/aws4_request, SignedHeaders=host;my-header1;x-amz-date;x-amz-region-set, Signature=3045022060b9f2f480a395bf34aa42074697f923c2355e26970987461ce904a6a2eeef52022100fc7ef73838bbfba208a8cf8f3edbe1c8879be7853b677f492db93c30df6fbe02