Set the raw (already encoded) POST data.
This function is here for two reasons: 1. For advanced user who would like to set their own data, already encoded 2. For backwards compatibilty: If someone uses the old post($data) method. this method will be used to set the encoded data.
$data can also be stream (such as file) from which the data will be read.
string|resource $data:
Zend_Http_Client
public function setRawData($data) {
$this->rawPostData = $data;
return $this;
}