Question

我最近正在做一个小型的URL缩短程序，并且在本地运行良好，但是当我尝试将其部署到Heroku时，它给了我H12，请求超时错误，有人可以帮我找到我混乱的地方吗up。我的代码中包含异步函数，但我不知道哪个函数可能导致超时。

HTML

 <div class="container">
    <h1>URL Shrinker</h1>
    <form action="/shortUrls" method="POST" class="my-4 form-inline">
        <label for="fullUrl" class="sr-only">Url</label>
        <input required placeholder="Url" type="url" name="fullUrl" id="fullUrl" class="form-control col mr-2">
        <button class="btn btn-success" type="submit">Shrink</button>
    </form>

    <table class="table table-striped table-responsive">
        <thead>
            <tr>
                <th>Full URL</th>
                <th>Short Url</th>
                <th>Clicks</th>
            </tr>
        </thead>
        <tbody>
            <% shortUrls.forEach(shortUrl => { %>

          
            <tr>
                <td><a href="<%= shortUrl.full %>"><%= shortUrl.full %></a></td>
                <td><a href="<%= shortUrl.short %>"><%= shortUrl.short %></a></td>
                <td><%= shortUrl.clicks %></td>
            </tr>
           <% }) %>
        </tbody>
    </table>
</div>
</body>

Server.js文件

const express = require('express');
const mongoose = require('mongoose');
const ShortUrl = require('./models/shortUrl');



const app = express();

mongoose.connect('mongodb://localhost/urlShortener', {
    useNewUrlParser: true, useUnifiedTopology: true
})

app.set('view engine', 'ejs');
app.use(express.urlencoded({
    extended: false
}))

app.get('/', async (req, res)=> {
    const shortUrls = await ShortUrl.find()
    res.render('index', { shortUrls: shortUrls});
});

app.post('/shortUrls', async(req, res)=>{
   await ShortUrl.create({
        full: req.body.fullUrl
    })
    
    res.redirect('/')
})

app.get('/:shortUrl', async(req, res)=>{
  const shortUrl = await ShortUrl.findOne({ short: req.params.shortUrl }) 

  if(shortUrl == null) return res.sendStatus(404)

  shortUrl.clicks++
  shortUrl.save()

  res.redirect(shortUrl.full)

})


const port = process.env.PORT || 5000

app.listen(port, () => {
    console.log(`server running at ${port}`)
});

Answer 1

看起来您正在保存并在文档保存之前发送重定向（保存会返回承诺），在保存之前添加await

await shortUrl.save()

我的应用程序部署到Heroku时，出现请求超时H12错误？

1 个答案: