Instaphp/Request.php
public function Post($url = null, $params = array())
    {
        if (null !== $url)
            $this->url = $url;

		if (!empty($params))
			$this->parameters = $params;

        $this->response = $this->GetResponse('POST');
        return $this;
    }
public function Post($url = null, $params = array())
    {
        if (null !== $url)
            $this->url = $url;

		if (!empty($params))
			$this->parameters = $params;

        $this->response = $this->GetResponse('POST');
        return $this;
    }
Makes a POST request
@param string $url A URL in which to make a POST request
@param Array $params An associative array of key/value pairs to pass to said URL
@return Request