Node.js NextJS/Vercel/MongoDB FetchError:请求http://localhost:3000/api/gear 失败，原因：connect ECONREFUSSED 127.0.0.1:3000

我使用NextJS对MongoDB进行API调用。当我转到API时，我看到MongoDB查询返回。然而，当我试图将该数据提取到网页时，我得到一个500内部服务器错误。函数日志显示以下错误：

2020-05-27T17:17:02.129Z    5a0c88b0-da63-4225-acf1-ea1d589ff438    ERROR   FetchError: request to http://localhost:3000/api/gear failed, reason: connect ECONNREFUSED 127.0.0.1:3000
    at ClientRequest.<anonymous> (/var/task/node_modules/next/dist/compiled/node-fetch/index.js:1:147710)
    at ClientRequest.emit (events.js:310:20)
    at Socket.socketErrorListener (_http_client.js:426:9)
    at Socket.emit (events.js:310:20)
    at emitErrorNT (internal/streams/destroy.js:92:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:60:3)
    at processTicksAndRejections (internal/process/task_queues.js:84:21) {
  message: 'request to http://localhost:3000/api/gear failed, reason: connect ECONNREFUSED 127.0.0.1:3000',
  type: 'system',
  errno: 'ECONNREFUSED',
  code: 'ECONNREFUSED'
}

api/gear.js

import nextConnect from 'next-connect';
import middleware from '../../middleware/database';

const handler = nextConnect();

handler.use(middleware);

handler.get(async (req, res) => {
    let gear = await req.db.collection('gear').find({}).sort({gear: 1}).toArray();
    res.json(gear);
});

export default handler;

database.js

import { MongoClient } from 'mongodb';
import nextConnect from 'next-connect';

const client = new MongoClient(process.env.MONGOURL, {
  useNewUrlParser: true,
  useUnifiedTopology: true,
});

async function database(req, res, next) {
  if (!client.isConnected()) await client.connect();
  req.dbClient = client;
  req.db = client.db('BassTabs');
  return next();
}

const middleware = nextConnect();

middleware.use(database);

export default middleware;

---

在Vercel上托管应用程序时，需要将获取URL更改为

https://my-bassist-chris.mybassistchris.now.sh/api/gear

，因为这就是数据的来源

---

在本地运行应用程序时，使用

localhost

在Vercel上托管应用程序时，需要将获取URL更改为

https://my-bassist-chris.mybassistchris.now.sh/api/gear

，因为这就是数据的来源

---

在本地运行应用程序时，您使用

localhost

伙计，我觉得自己像个傻瓜，这就是问题所在。谢谢你的帮助！伙计，我觉得自己像个傻瓜，这就是问题所在。谢谢你的帮助！

import { MongoClient } from 'mongodb';
import nextConnect from 'next-connect';

const client = new MongoClient(process.env.MONGOURL, {
  useNewUrlParser: true,
  useUnifiedTopology: true,
});

async function database(req, res, next) {
  if (!client.isConnected()) await client.connect();
  req.dbClient = client;
  req.db = client.db('BassTabs');
  return next();
}

const middleware = nextConnect();

middleware.use(database);

export default middleware;