Response.php
public function SendHeaders()
    {
        // headers have already been sent
        if (headers_sent()) {
            return $this;
        }

        header('HTTP/'.$this->Version.' '.$this->StatusCode.' '.$this->StatusText, true, $this->StatusCode);

        foreach ($this->Headers->GetCookies() as $cookie) {
        }

        return $this;
    }
public function SendHeaders()
    {
        // headers have already been sent
        if (headers_sent()) {
            return $this;
        }

        header('HTTP/'.$this->Version.' '.$this->StatusCode.' '.$this->StatusText, true, $this->StatusCode);

        foreach ($this->Headers->GetCookies() as $cookie) {
        }

        return $this;
    }
Sends HTTP headers.

@return $this