rust - How to change Iron's default 404 behaviour? -

i want change default 404 behaviour in small iron application. want add simple text content it, nothing complicated using templates.

create , start program on iron::chain, , create iron::middleware::aftermiddleware. middleware like:

fn custom_404(req: &mut request, res: &mut response) -> ironresult<response> {     if response.status == some(status::notfound) {         // create response desired here.     } }