How to change Iron's default 404 behaviour?

问题:

I want to change the default 404 behaviour in a small Iron application. I want to add some simple text content to it, nothing complicated like using templates.

回答1:

Iron has an example for how to do this.

Create and start your program on an iron::Chain, and then create an iron::middleware::AfterMiddleware. This middleware could look like:

fn custom_404(req: &mut Request, res: &mut Response) -> IronResult<Response> {
    if response.status == Some(Status::NotFound) {
        // Create a response as desired here.
    }
}