egg.js设置了中间件，为啥状态为404 了

Question

在路由中设置的中间件，去掉中间件正常，加上中间件status=404了？

//中间件
const jwt = require('jsonwebtoken');
const { config } = require('./../utils/config');

module.exports = () => {
    return async function isAuth(ctx, next) {
        const token = ctx.cookies.get('token', { signed: false });
        if (token) {
            jwt.verify(token, config.privateKey, async function(err, decoded) {
                if (err) {
                    console.log(err);
                    ctx.body = {
                        code: 5001,
                        data: null,
                        msg: 'token失效！'
                    };
                    return;
                }
               
                ctx.request.body.sessionKey = decoded.sessionKey;
                ctx.request.body.token = token;
                await next();
            });
        } else {
            ctx.body = {
                code: 5003,
                data: null,
                msg: '请求出错，无token！'
            };
        }
    };
};

//路由
    const isAuth = middleware.isAuth();

 apiRouter.post('/updateUserInfo', isAuth, clientUserInfo.updateUserInfo);

//控制器
//有返回body内容

Answer 1

if (token) {
  try {
    const decoded = jwt.verify(token, config.privateKey);
    ctx.request.body.sessionKey = decoded.sessionKey;
    ctx.request.body.token = token;
  } catch (err) {
    console.log(err);
    ctx.body = {
      code: 5001,
      data: null,
      msg: 'token失效！',
    };
  }
  await next();
}