public function post($url, $postData = null, $headers = null, $options = null)
    {
        return $this->request($url, "POST", $postData, $headers, $options);
    }
public function post($url, $postData = null, $headers = null, $options = null)
    {
        return $this->request($url, "POST", $postData, $headers, $options);
    }
public function post ( $ url , $ postData = null , $ headers = null , $ options = null ) { return $ this -> request ( $ url , "POST" , $ postData , $ headers , $ options ) ; }
Perform POST request

@param  string       $url
@param  array|string $postData
@param  array        $headers
@param  array        $options

@return RollingCurl
Perform POST request