Question

我正在尝试使用Node.js，Express和MongoDB构建REST API。到目前为止，一切似乎都可以进行。服务器启动并连接到数据库。 DB（命名为API）具有两个集合（文章和源）。我正在尝试将GET请求发送到Articles集合。但是，当我发送请求时，Postman会挂起，然后给出一个错误并导致服务器崩溃：

Could not get any response
There was an error connecting to localhost:3000/articles.
Why this might have happened:
The server couldn't send a response:
Ensure that the backend is working properly
Self-signed SSL certificates are being blocked:
Fix this by turning off 'SSL certificate verification' in Settings > General
Proxy configured incorrectly
Ensure that proxy is configured correctly in Settings > Proxy
Request timeout:
Change request timeout in Settings > General

服务器崩溃时会引发以下错误：

FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
 1: 0x10007e891 node::Abort() [/usr/local/Cellar/node/13.8.0/bin/node]
 2: 0x10007e9c0 node::OnFatalError(char const*, char const*) [/usr/local/Cellar/node/13.8.0/bin/node]
 3: 0x10017e6ab v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [/usr/local/Cellar/node/13.8.0/bin/node]

我的代码如下：

require('dotenv').config()

const express = require('express') 
const app = express()
const mongoose = require('mongoose')

mongoose.connect(process.env.DATABASE_URL, { useNewUrlParser: true , useUnifiedTopology: true })
const db = mongoose.connection
db.on('error', (error) => console.error(error))
db.once('open', () => console.log('Connected to Database'))

app.use(express.json())

const articlesRouter = require('./routes/articles')
app.use('/articles', articlesRouter)

app.listen(3000, () => console.log('Server Started'))

我的路线；我正在尝试发送GET请求以获取数据库中所有文章（位于Articles集合中）：

const express = require('express')
const router = express.Router()
const Article = require('../models/articles')

//Getting All Articles
router.get('/', async (req, res) => {
  try {
      const articles = await Article.find()
      res.json(articles)
  } catch (err){
    res.status(500).json({message: err.message})
  }
})

//Getting One Article
router.get('/:id', (req, res) => {

})

module.exports = router

如果我将router.get更改为此router.get('/articles', async (req, res)，邮递员将不再挂起，而是抛出以下错误：

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <title>Error</title>
</head>

<body>
    <pre>Cannot GET /articles</pre>
</body>

</html>

我的路线：

const mongoose = require('mongoose')

const articlesSchema = new mongoose.Schema({
    author: String, content: String, description: String, publishedAt: Date, source_id: String, summarization: String, title: String, url: String, urlToImage: String}, { collection: 'Articles'});

module.exports = mongoose.model('article', articlesSchema)

正如我在一开始提到的那样，这是我首次尝试构建REST API。您能提供的任何帮助来帮助我弄清为什么邮递员GET请求没有通过的帮助将不胜感激。

Answer 1

您的代码似乎正确。我遇到的一件事是在您指定的路线中

`router.get('/', async (req, res) =>{})`

，您将api称为 “ localhost:3000/articles”不正确。您尚未将任何路线指定为

router.get('/articles', async (req, res) =>{})。

因此邮递员无法找到这样的路线，并且没有回应。尝试使用我在上面指定的路由，或仅在路由中指定的地方调用“ localhost:3000/”。

您可以做的其他事情就是将以下行放在 app.js 文件中，而无需更改代码中的其他任何内容。

app.use('/articles', articlesRouter)

希望这对您有所帮助。

邮递员GET请求挂起，从不返回任何结果

1 个答案: