I am making a project on Newsletter of web development by angela Yu and a project of NewsLetter is going on in which I got 404 error which includes API from The MAILCHIMP website and when I put the api inside it and everytime it is howing error 404

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

const app = express();
app.use(express.static("public"));
app.use(bodyParser.urlencoded({extended:true}));
app.get("/",function(req,res)
{
    res.sendFile(__dirname + "/signup.html");
});
app.post("/",function(req,res)
{
var firstName = req.body.fName;
var lastName = req.body.lName;
var email = req.body.email;

var data = {
    members: [
        {email_address: email,
        status: "subscribed"
        }
    ] 
};

var jsondata = JSON.stringify(data);

var options={
  url: "https://us18.mailchimp.com/3.0/lists/3328c667f4",
  method:"POST",
  headers: {
      "Authorization" : "removed"
  },
  body: jsondata
};

// console.log(firstName,lastName,email);
  request(options,function(error,response,body)
  {
    if(error)
    {
        console.log(error);
    }
    else{
        console.log(response.statusCode);
    }
  });
});

app.listen(3000,function()
{
    console.log("Server is listening on port 3000");
})