错误：请求失败，状态代码 404、React、Axios

Question

我已经构建了一个我希望能够发送电子邮件的表单，为此我尝试遵循此 YouTube 教程：https://www.youtube.com/watch ?v=_3-By9QfFa0

然而，我遇到了一个问题，当我尝试提交表单时，我的控制台网络浏览器中出现问题标题错误。我意识到这个问题可能与某处的其中一条路线有关，但我只是无法弄清楚（除非它是完全不同的东西）。

schoolForm.js

const handleSubmit = async(e) => {
e.preventDefault();
try { //I also tried using only: "/send_mail" here like I have in server.js but it didnt work
  await axios.post("http://localhost:3000/send_mail", {
    name
  });
}
catch (error) {
  console.log(error);
  }
}

服务器.js

const express = require("express");
const app = express();
require("dotenv").config();
const bodyParser = require("body-parser");
const cors = require("cors");
const nodemailer = require("nodemailer");

app.use(bodyParser.urlencoded({extended: true}));
app.use(bodyParser.json());

app.use(cors());

app.post("/send_mail", cors(), async (req, res) => {
  let {text} = req.body;
  const transport = nodemailer.createTransport({
    host: "smtp-mail.outlook.com",
    port: 587,
    auth: {
      user: "someone@hotmail.com",
      pass: "password"
    },
    tls: {
      rejectUnauthorized: false
    }
  });

 await transport.sendMail({
    from: "someone@hotmail.com",
    to: "someone@hotmail.com",
    subject: "subject",
    html: `<p>${text}</p>`
  })

});

app.listen(4000, () => {
  console.log("Server is listening on port 4000");
});

编辑：我在浏览器中遇到的错误：

有谁可以帮我解决这个问题吗？帮助将不胜感激！

Answer 1

您的服务器正在侦听端口4000。// 服务器.js

app.listen(4000, () => {
  console.log("Server is listening on port 4000");
});

您应该使用以下URL进行 Axios 调用。// schoolForm.js

await axios.post("http://localhost:4000/send_mail", {    // use port 4000 not 3000
    name
});