Mailgun webhooks test webhook works but actual one doesn't

help
1

Hello guys, I am trying to use mailgun webhooks

This is my server code main.js

import { Meteor } from 'meteor/meteor'
import { Accounts } from 'meteor/accounts-base'
import { Emails } from '../imports/collections/emails/Emails'
import { WebApp } from 'meteor/webapp'
import ConnectRoute from 'connect-route'


Meteor.startup(() => {
  // code to run on server at startup
  process.env.MAIL_URL = 'smtp://postmaster%40backtocart.co:0d1af42a4928eb3dd1b111643aa9088a@smtp.mailgun.org:587'
  Accounts.emailTemplates.from = 'backtocart <info@backtocart.co>'

  Meteor.publish('emails', function() {
    return Emails.find({})
  })
})

function onRoute (req, res, next) {
  // 5p14i is for clicks
  // aif6r is for opens
  console.log('req', req)
  // const { token } = req.params
  // if (token === '5p14i') {
  //   console.log('clicks')
  // } else if (token === 'aif6r') {
  //   console.log('opens')
  // }
  // next()
  var rawPostBody = ''
  var postData = []

  req.on('data', function (chunk) {
    console.log('on data')
    rawPostBody += chunk.toString()
  })
  req.on('end', function () {
    console.log('on end')
    pairs = rawPostBody.split('&')
    for(var i = 0; i < pairs.length; i++) {
      kv = pairs[i].split('=')
      postData[kv[0]]=decodeURIComponent((kv[1] + '').replace(/\+/g, '%20'))
      console.log('postData', postData)
    }})
    console.log('next is called after I log')
    next()
}

const middleware = ConnectRoute(function (router) {
  // 2uik9 is for webhooks requests
  router.post('/2uik9/:token', onRoute)
})

WebApp.connectHandlers.use(middleware)

I have this link https://b2c.meteorapp.com/2uik9/aif6r set as email opens’ tracking webhook.
When I set it as webhook and click test webhook in the mailgun, everything seems to work great. The webhook gets response and on my servers I can see the request logged. However when I send an actual email and open it no request is sent to that link. However I can see the tracking pixel inserted in the mail.
Can you help me with this? At least please tell me what do you think is everything done correct programmatically?
Thank you.