How to redirect to koa?

Question

Node.js

For rendering I use Pug.
Option 1:

app.use(async (ctx, next) => {
    if (ctx.status === 404) {// always is 404
      ctx.redirect('/node/404');
    }
    await next();
  });

A middleware is used to catch missing pages, but Koa always has a 404 status unless manually changed. Accordingly, the redirect will occur from any page. But! The redirected page is not rendered at all, and nginx (it's for static) gives "this page unreachable".
Option 2:

const router = new Router({prefix: 'auth'});
router.post('/signin', authController.signIn);

async signIn(ctx) {
   // проверяю параметры и по их результатам делаю редирект

    ctx.redirect('/node');
  },

In this case, instead of a redirect, I get in the response body the html of the rendered page, to which, in fact,
the redirect should take place (as if I was doing ctx.body = {data: pug.renderFile(pattern)})