node.js - 使用 axios 时套接字挂起

Question

我遇到错误“错误:套接字挂起”，我不知道是什么原因导致的，但它会将数据保存在数据库中。

这是我的代码:

数据模式.js

const mongoose = require("mongoose");

const DataSchema = new mongoose.Schema({
  data1: {
    type: String
  },
  data2: {
    type: String
  },
  data3: {
    type: String
  },
  data4: {
    type: String
  },
});

const DataModel = mongoose.model("TEST123", DataSchema);

module.exports = DataModel;

路由.js

const express = require("express");
const app = express();
const mongoose = require("mongoose");
const DataModel = require('./models/dataschema');

var bodyParser = require('body-parser');
app.use(bodyParser.json());

mongoose.connect(
    "mongodb://localhost:27017/stocksmonitor?readPreference=primary&appname=MongoDB%20Compass%20Community&ssl=false",
    { useNewUrlParser: true }
);

app.post('/insert', (req, res) => {

    const stock = new DataModel({
        data1: req.body[0],
        data2: req.body[1],
        data3: req.body[2],
        data4: req.body[3],
    })
    
    stock.save();
    
})

app.listen(3001, () => {
    console.log("You are connected");
})

保存数据.js

const axios = require('axios');

SaveInfo = () => {

  const testdata = ["a", "b", "c", "d"]

  axios({
      method: 'post',
      url: 'http://localhost:3001/insert',
      data: testdata
  })
  .then(function (response) {
      console.log(response);
  })
  .catch(function (error) {
      console.log(error);
  });
}
SaveInfo(); 

Answer 1

我检查了代码，发现您没有为您的 Controller 返回响应。保存后在下面的代码中添加 res.send() 或 res.json()。所以 express 可以返回一个正确的响应。否则请求会超时，因为它没有解析，Express 会切断连接。因此 axios 抛出 Error: Socket hang up unexpectedly。

app.post('/insert', (req, res) => {

    const stock = new DataModel({
        data1: req.body[0],
        data2: req.body[1],
        data3: req.body[2],
        data4: req.body[3],
    })
    
    stock.save();
})