POST路由可在localhost上运行，但不能在服务器上运行

如何解决POST路由可在localhost上运行，但不能在服务器上运行

使我的Web应用程序在digitalocean服务器上工作时遇到问题。一切都可以在localhost上正常运行，但是一旦在服务器上我就无法发布/ kontakt

这是我的ejs模板表格

<form action="/kontakt" method="post">
                            <input type="text" minlength="4" placeholder="MENO" name='email[name]' required>
                            <input type="email" placeholder="E-MAIL" name='email[email]' required>
                            <textarea id="" minlength="20" cols="30" rows="4" placeholder="SPRÁVA" name='email[text]' required></textarea>
                            <button>odoSLAŤ</button>
                        </form>

和我的app.js

if(process.env.NODE_ENV !== 'production'){
    require('dotenv').config()
}

const express = require('express'),indexapp = require('./routes/index'),nodemailer = require('nodemailer'),flash = require('connect-flash'),bodyParser = require('body-parser'),cookieParser = require('cookie-parser'),session = require('express-session'),app = express(),mailapp = require('./routes/mail');


app.set('view engine','ejs')
app.set('views',__dirname + '/views')
app.use(express.static('public'))

app.use(cookieParser('secret'));
app.use(session({cookie: { maxAge: 60000 }}));
app.use(flash());


app.use(express.urlencoded()); 
    let transporter = nodemailer.createTransport({
    service: 'Gmail',auth: {
        user: '*****',pass: '*****',},});

app.post('/kontakt',(req,res) => {

  transporter.sendMail({
      'transporter settings'
  res.redirect('/kontakt')
})

app.use('/',indexapp)

app.listen(process.env.PORT || 3000) 

有人知道怎么了吗？