POST / HTTP/1.1
Host: us-east-1.ec2.amazonaws.com
Connection: close
Accept-encoding: gzip, deflate
User-Agent: Zend_Http_Client
Content-Type: application/x-www-form-urlencoded
Content-Length: 243

Action=DescribeInstances&InstanceId.1=i-6cfcb00c&AWSAccessKeyId=0123456789&SignatureVersion=2&Timestamp=2011-10-04T10%3A20%3A31Z&Version=2009-04-04&SignatureMethod=HmacSHA256&Signature=qK4FN3uM%2BfXuoUzhqY6HWv7vTYFHooGpD9HYY0WT5Lw%3D