Error: Request failed with status code 404 when submitting a form?

Question

Node.js

Hello everybody!
I transferred the files to the hosting, everything is fine, except for one. There is a form, after the submission of which the data from this form should come to the email. But the letters do not come and there is an error in the console


Server part

const dotenv = require("dotenv");
dotenv.config({ path: __dirname + "/.env" });

const express = require("express");
const bodyParser = require("body-parser");
const nodemailer = require("nodemailer");
const favicon = require("serve-favicon");
const app = express();

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(favicon(__dirname + "/favicon.ico"));

app.post("/contacts", (req, res) => {
  console.log(req.body);
  nodemailer.createTestAccount((err, account) => {
    const htmlEmail = `
        <h3>Контактная информация:</h3>
        <ul>
        <li>Имя: ${req.body.name}</li>
        <li>Фамилия: ${req.body.lastName}</li> 
        <li>Email: ${req.body.email}</li>
        <li>Телефон: ${req.body.phone}</li>
        <li>Организация: ${req.body.organization}</li>
        </ul>
        <h3>Сообщение</h3>
        <p>${req.body.message}</p>
        `;
    let transporter = nodemailer.createTransport({
      host: "cpanel08.helpdesk.by",
      port: 465,
      secure: true,
      requireTLS: true,
      auth: {
        user: process.env.REACT_APP_EMAIL,
        pass: process.env.REACT_APP_PASS
      }
    });

    transporter.verify(function(error, success) {
      if (error) {
        console.log(error);
      } else {
        console.log("Server is ready to take our messages");
      }
    });
    let mailOptions = {
      to: process.env.REACT_APP_EMAIL,
      from: req.body.name,
      subject: "Новое сообщение",
      text: req.body.message,
      html: htmlEmail
    };
    transporter.sendMail(mailOptions, (err, info) => {
      if (err) {
        return console.log(err);
      }
    });
  });
});

const PORT = process.env.PORT || 3001;

if (process.env.NODE_ENV === "production") {
  // Serve any static files
  app.use(express.static(path.join(__dirname, "/build")));

  // Handle React routing, return all requests to React app
  app.get("*", function(req, res) {
    res.sendFile(path.join(__dirname, "/build", "index.html"));
  });
}

app.listen(PORT, () => {
  console.log(`Server listening on port ${PORT}`);
});

The form itself

<form
              id="contact-form"
              onSubmit={this.handleSubmit}
              method="POST"
              className={style.contact_form}
            >
              <input
                placeholder="Имя"
                type="text"
                className="form_control"
                name="name"
                onChange={this.handleChange}
              />

              <input placeholder="Фамилия"
              type="text"
              className="form_control"
              name="lastName"
              onChange={this.handleChange} />

              <input placeholder="Организация"
              type="text"
              className="form_control"
              name="organization"
              onChange={this.handleChange} />

              <input
                type="email"
                className="form_control"
                name="email"
                placeholder="Email"
                onChange={this.handleChange}
              />

              <input placeholder="Телефон"
              type="tel"
              className="form_control"
              name="phone"
              onChange={this.handleChange} />

              <textarea
                className="form_control"
                rows="5"
                name="message"
                onChange={this.handleChange}
                placeholder='Сообщение'
              />

              <button className={style.submit_btn} type="submit"
              onClick={this.resetForm}
              >
                Отправить
              </button>
            </form>

const form = await axios
      .post("/contacts", {
        name,
        email,
        message,
        lastName,
        phone,
        organization
      })
      .then(response => {
        console.log(response);
        if (response === "success") {
          alert("Message Sent.");
          this.resetForm();
        } else if (response.data.msg === "fail") {
          alert("Message failed to send.");
        }
      });
  }

What could be wrong? I wrote the code according to the example, because I have never come across such a thing. Previously, in the "proxy" field in package.json, I wrote "proxy": " localhost:3001 ".
Locally everything worked, and letters came to email.

Answer 1

Run the server part in debug mode (DEBUG=express:*) and see what happens there when a request is received and whether it reaches it at all