show_error and show_404 do not send headers from output lib

[eluser]louis w[/eluser]
If you set a page header using the $this->output->set_header it does not get sent to the browser when a request results in show_404.

Is this on purpose?

[eluser]Michael Wales[/eluser]
For 404 I am sure it is on purpose, since it includes it's own header() call within the template.