fuel/fuel/core/classes/response.php
public function set_header($name, $value, $replace = true)
	{
		if ($replace)
		{
			$this->headers[$name] = $value;
		}
		else
		{
			$this->headers[] = array($name, $value);
		}

		return $this;
	}
public function set_header($name, $value, $replace = true)
	{
		if ($replace)
		{
			$this->headers[$name] = $value;
		}
		else
		{
			$this->headers[] = array($name, $value);
		}

		return $this;
	}
public function set_header ( $ name , $ value , $ replace = true ) { if ( $ replace ) { $ this -> headers [ $ name ] = $ value ; } else { $ this -> headers [ ] = array ( $ name , $ value ) ; } return $ this ; }
Adds a header to the queue

@param   string  The header name
@param   string  The header value
@param   string  Whether to replace existing value for the header, will never overwrite/be overwritten when false

@return  Response
Adds a header to the queue