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如何修复对 Node.js 服务器的 Fetch 请求?

[英]How to fix Fetch request to Node.js server?

我正在尝试使用 fetch 做一个简单的 POST 请求。 我正在尝试在前端使用 Vanilla Javascript、HTML、CSS 和在后端使用 Z3B2819/ExpressEEF 来创建联系表格。 这是我的前端代码:

            <form id="sendMail">
                <div>
                  <label for="name">Name: </label>
                  <input name="name" id="name" placeholder="Name">
                </div>
                <div>
                  <label for="email">Email: </label>
                  <input name="email" id="email" placeholder="Email">
                </div>
                <div>
                    <label for="phone">Phone: </label>
                    <input name="phone" id="phone" placeholder="Phone">
                  </div>
                <div>
                    <label for="subject">Message: </label>
                    <input name="subject" id="subject" placeholder="How can we help you?">
                </div>
                <div>
                  <input type="submit">Send Message</input>
                </div>
            </form> 

<script>
  document.getElementById("sendMail").addEventListener('submit', sendMail);

  function sendMail(e) {
    e.preventDefault();

    let name = document.getElementById("name").value;
    let email = document.getElementById("email").value;
    let phone = document.getElementById("phone").value;
    let subject = document.getElementById("subject").value;

    console.log("sendMail fired!", name, email, phone, subject);

    fetch('/api/contact', {
        method: 'POST', 
        headers: {
          'Accept': 'application/json, text/plain, */*',
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({name: name, email: email, phone: phone, subject: subject}),
      })
    //   .then(response => response.json())
      .then(data => {
        console.log('Success:', data);
      })
      .catch((error) => {
        console.error('Error:', error);
      });
  } 
</script>   

这是我在后端的代码:

const http = require('http');
const express = require('express');
const path = require('path');
const cors = require('cors');

const app = express();

app.use(cors());
app.use(express.json());
app.use(express.static("express"));

// default URL for website
app.use('/', function(req,res){
    res.sendFile(path.join(__dirname+'/express/index.html'));
    //__dirname : It will resolve to your project folder.
  });

const server = http.createServer(app);
const port = 4040;

const nodemailer = require('nodemailer');

app.post('/api/contact', async(req, res, next) => {
  const { name, email, phone, subject } = req.body;
  console.log("sendMail fired: ", req.body, name, email, phone, subject);

  const transporter = nodemailer.createTransport({
      service: 'gmail',
      auth: {
          user: 'myEmailAddress',
          pass: 'myPassword',
      }
  });

  let mailOptions = await transporter.sendMail({
      from: `info@companyemailaddress`,
      to: `${email}`,
      subject: `company`,
      text:
          `${name}, \n\n` +
          `Thank you for contacting company! A representative will contact you within 2 business days. \n\n` +
          `If you have any further question, feel free to email us at:  \n\n` +
          `info@company \n\n` +
          `- company Automated Message`
  });

  console.log('Message sent: %s', mailOptions.messageId);
  // console.log('Preview URL: %s', nodemailer.getTestMessageUrl(mailOptions))

  let mailOptions2 = await transporter.sendMail({
    from: `info@companyemail address`,
    to: `myEmail`,
    subject: `company`,
    text:
        `Name: ${name}, \n\n` +
        `Email: ${email}, \n\n` +
        `Phone: ${phone}, \n\n` +
        `Subject: ${subject}, \n\n`
  });

  console.log('Message sent: %s', mailOptions2.messageId);

  res.send('Email sent!')   
})


server.listen(port);

console.debug('Server listening on port ' + port);

当我点击前端的“提交”输入时,我得到了一个成功的响应,没有任何服务器错误消息,但是当我查看我的服务器 console.logs 时,它什么也没显示 - 好像服务器没有被触及。 如果我只是在不是 JSON.stringify() 的 post 请求的正文中发送 object,则服务器会给出错误消息,指出正文中的 ZA8CFDE6331BD59EB2AC96F8911C4B666 存在问题。 所以看起来 POST 请求正在成功地联系服务器。 但什么也没有发生。

我究竟做错了什么?

您应该将路由从app.useapp.get

当您在/上使用app.use时,它会匹配任何带有任何 http 动词路由并充当全局中间件

因此,您的发布请求实际上与该app.use匹配,而您的实际app.post从未有机会执行。

您可以使用 postman 测试您的 api,然后为您生成获取请求。 在您的情况下,您应该将完整的 uri 作为 args 放入您的 fetch 调用中。

fetch('http://example.com/movies.json')

.then(response => response.json()).then(console.log);

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