Question

我正在next.js中构建一个Web应用程序并将其托管在Vercel上。我已经在MongoDB Atlas中建立了一个数据库集群，可以在开发中（从本地主机）和MongoDB指南针连接到该数据库集群，但是当我将其部署到Vercel时，int main(void) { char name[sizeof("MatthewGamer") + sizeof("PlayGames") - 1] = "MatthewGamer"; char name2[] = "PlayGames"; printf("%s\n", add_str(name, name2)); }会给我一个HTTP 502错误。

我是否可以从本地主机而不是从Vercel部署的应用程序进行连接？根据Atlas仪表板上的连接说明，我的连接字符串为client.connect()。

Answer 1

您是否已在MongoDb仪表板的网络访问配置中将Vercel ip添加到白名单？您可以尝试添加中间件进行连接，并捕获任何错误。我也可以尝试在连接字符串中不使用“ retryWrites = true”。

中间件

import { MongoClient } from 'mongodb';

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

export default async function database(req, res, next) {
  if (!client.isConnected()) await client.connect();
  req.dbClient = client;
  req.db = client.db(process.env.DB_NAME);
  await setUpDb(req.db);
  return next();
}

您只需要设置环境变量。 This tutorial可能有用

Answer 2

试试这个代码可能会有所帮助。

const Express = require("express");
const BodyParser = require("body-parser");
const MongoClient = require("mongodb").MongoClient;
const ObjectId = require("mongodb").ObjectID;
const CONNECTION_URL = "mongodb+srv://id:password@portfolio.t6jry.mongodb.net/myinfo?retryWrites=true&w=majority";
const DATABASE_NAME = "info";

const port = process.env.PORT || 3000;

var app = Express();
app.use(BodyParser.json());
app.use(BodyParser.urlencoded({ extended: true }));
var database, collection;

app.listen(port, () => {
    MongoClient.connect(CONNECTION_URL, { useNewUrlParser: true }, (error, client) => {
        if(error) {
            throw error;
        }
        database = client.db(DATABASE_NAME);
        collection = database.collection("myinfo");
        console.log("Connected to `" + DATABASE_NAME + "`!");
    });
});

app.get("/", (req, res, next) => {
    return res.json({ message: "Server Running" });
  });

app.get("/info",async (request, response) => {
    MongoClient.connect(CONNECTION_URL, { useNewUrlParser: true }, (error, client) => {client.db("info").collection("myinfo").find({}).toArray((error, result)  => {
        if(error) {
            return response.json({ status: 500, message: "Internal Server Error" });
        }
        else if (!result) {
          return response.json({ status: 422, message: "Document Not Found" });}
        else{  return response.json({ status: 200, message: result});}
    });
})
});

app.post("/postdata",async (request, response) => {
    MongoClient.connect(CONNECTION_URL, { useNewUrlParser: true }, (error, client) => {client.db("info").collection("myinfo").find({}).toArray((error, result)  => {
        if(error) {
            return response.json({ status: 500, message: "Internal Server Error" });
        }
        else if (!result) {
          return response.json({ status: 422, message: "Document Not Found" });}
        else{  return response.json({ status: 200, message: result});}
    });
})
});

MongoDB在Vercel托管应用中返回502错误

2 个答案: