src/Router/Response.php
public function headers($headers = false)
    {
        $this->headers = array_unique(array_merge($this->headers, $headers));

        return $this;
    }
public function headers($headers = false)
    {
        $this->headers = array_unique(array_merge($this->headers, $headers));

        return $this;
    }
public function headers ( $ headers = false ) { $ this -> headers = array_unique ( array_merge ( $ this -> headers , $ headers ) ) ; return $ this ; }
@param bool $headers

@return $this
@param bool $headers