如何将 404 错误重定向到 ExpressJS 中的页面? [英] How to redirect 404 errors to a page in ExpressJS?

问题描述

我不知道这样做的函数，有人知道吗?

I don't know a function for doing this, does anyone know of one?

推荐答案

我发现这个例子很有帮助:

I found this example quite helpful:

https://github.com/visionmedia/express/blob/master/examples/error-pages/index.js

所以，实际上是这部分:

So, it is actually this part:

// "app.router" positions our routes
// above the middleware defined below,
// this means that Express will attempt
// to match & call routes _before_ continuing
// on, at which point we assume it's a 404 because
// no route has handled the request.

app.use(app.router);

// Since this is the last non-error-handling
// middleware use()d, we assume 404, as nothing else
// responded.

// $ curl http://localhost:3000/notfound
// $ curl http://localhost:3000/notfound -H "Accept: application/json"
// $ curl http://localhost:3000/notfound -H "Accept: text/plain"

app.use(function(req, res, next) {
  res.status(404);

  // respond with html page
  if (req.accepts('html')) {
    res.render('404', { url: req.url });
    return;
  }

  // respond with json
  if (req.accepts('json')) {
    res.json({ error: 'Not found' });
    return;
  }

  // default to plain-text. send()
  res.type('txt').send('Not found');
});

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