How to solve 503 axios error problem?

Question

Node.js

Hello everyone, after sending a POST request using Axios, I get a 503 error after a while (it flies to the console). At the same time, the data arrives at the server and everything is fine with them. Please help me, how can I hide it, my telegram bot is crashing because of it.



Request code to send data to the server: https://codesandbox.io/s/stoic-allen-x82ux7?file=/...

Server code:

const express = require("express");
const cors = require("cors");
const bodyParser = require("body-parser");

const app = express();

app.use(bodyParser());

const PORT = process.env.PORT || 80;

app.listen(PORT, () => {
  try {
    console.log(`Server started on ${PORT}...`);
  } catch (e) {
    console.error(`${e} - app.listen`);
  }
});

const userList = [];
let userData = [];

app.get("/userList", (req, res) => {
  try {
    res.send(userList);
  } catch (e) {
    console.error(`${e} - app.get("/userList")`);
  }
});

app.get("/userData", (req, res) => {
  try {
    res.send(userData);
  } catch (e) {
    console.error(`${e} - app.get("/userData")`);
  }
});

app.post("/userData", (req, res) => {
  try {
    userData = req.body;
  } catch (e) {
    console.error(`${e} - app.post("/userData")`);
  }
});

app.post("/userList", (req, res) => {
  try {
    userList.push(req.body);
  } catch (e) {
    console.error(`${e} - app.post("/userList")`);
  }
});

app.use(cors());

Thank you very much in advance!