Nodemailer /发送给出404错误

Question

我正在尝试使用nodemailer将邮件从标准网站表单发送到电子邮件地址。我遵循了此tutorial，所有内容都在本地服务器上运行。但是，当我将文档上传到托管服务提供商时，出现以下错误：

POSThttp://mydomain.rs/send404（未找到）
未找到
在此服务器上找不到请求的URL /发送。
此外，尝试使用404未找到错误ErrorDocument处理请求。

我有与nodemailer相关的三个文件，它们是：

app.js

var http = require('http');
var express = require('express');
var nodemailer = require("nodemailer");
var bodyParser = require('body-parser');
var path = require('path');
var app = express();
var port = Number(process.env.PORT || 5000);

app.use(bodyParser.json()); // to support JSON-encoded bodies
app.use(bodyParser.urlencoded(
    extended: true
));

app.use(express.static(__dirname + '/'));

// Home page
app.get('/', function (req, res) 
    res.sendFile('index.html');
    //console.log 
    console.log('NodeMailer reading console log...' + req.url);

);

// sending mail function
app.post('/send', function (req, res) 
    if (req.body.email == "" || req.body.subject == "") 
        res.send("Error: Email & Subject should not blank");
        return false;
    

    // Sending Emails with SMTP, Configuring SMTP settings

    var smtpTransport = nodemailer.createTransport("SMTP", 
        host: "mail.mydomain.rs", // hostname
        secureConnection: true, // use SSL
        port: 465, // port for secure SMTP
        auth: 
            user: 'messages@mydomain.rs',
            pass: 'password'
        ,
        proxy: 'http://mydomain.rs:' + port
    );
    var mailOptions = 
        from: "Node Emailer ✔ <messages@mydomain.rs>", // sender address
        to: req.body.emailto, // list of receivers
        subject: req.body.subject + " ✔", // Subject line
        //text: "Hello world ✔", // plaintext body
        html: "<b>" + req.body.description + "</b>" // html body
    
    smtpTransport.sendMail(mailOptions, function (error, response) 
        if (error) 
            res.send("Email could not sent due to error: " + error);
         else 
            res.send("Email has been sent successfully");
        
    );
);

// Starting server
    var server = http.createServer(app).listen(port, function () 
        console.log("Server is Running on 127.0.0.1:" + port);
    );

索引页中与表格有关的部分：

index.html

        <form role="form" id="emailForm" method="post">
            <div class="form_content">
                <h2>KONTAKTIRAJTE&nbsp;NAS</h2>
                <p id="msg"></p>
                <input type="text" name="ime" placeholder="IME" required="required" />
                <input type="tel" name="telefon" placeholder="TELEFON" />
                <p class="mini_text">
                    Otvoreni od 8h - 17h
                    <br> Zatvoreni vikendom osim za posebne usluge
                </p>
                <input type="email" name="emailto" value="myactualemail@gmail.com" style="visibility: hidden; position: absolute;">
                <input type="email" name="email" placeholder="EMAIL" required="required" />
                <textarea name="description" placeholder="PORUKA" required="required"></textarea>
                <button id="send" type="button">POŠALJI</button>
            </div>
        </form>

和package.json


  "name": "speednodemailers",
  "version": "0.0.1",
  "description": "NodeJs email form to send email using nodejs",
  "dependencies": 
    "body-parser": "^1.13.3",
    "express": "^3.21.2",
    "node-mailer": "^0.1.1",
    "nodemailer": "^0.7.1"

因此，正如我所提到的，一切都可以在localhost上正常运行，当我将项目上传到托管服务提供商时，就会出现问题。

我缺少上载的步骤吗？还是我忽略的设置？任何帮助都将不胜感激，因为我是后端方面的新手。

谢谢！