Sending push from parse server hosted in heroku - heroku

Question

I am following standard tutorial for using parse server in heroku from here.
https://github.com/ParsePlatform/parse-server/wiki/Push
I have used development .p12 file. My code in parse server is like this.
push: {
ios: {
pfx: 'mycert.p12', // The filename of private key and certificate in PFX or PKCS12 format from disk
bundleId: 'com.khantthulinn.example', // The bundle identifier associate with your app
production: false // Specifies which environment to connect to: Production (if true) or Sandbox
}
}
I use this curl to send push notification. App Id and master key is changed to fake one.
curl -X POST \
-H "X-Parse-Application-Id: QCsRSsKJTHs2YGi2BdBsLTLcf4U1JpQoRtTU9d0l
" \
-H "X-Parse-Master-Key: XoEVsXstyWl3M8sJK1qO0ll1G5bWJpTUmhX90du1
" \
-H "Content-Type: application/json" \
-d '{
"where": {
"deviceType": { "$in": [ "ios", "android" ] }
},
"data": {
"title": "Ant-man",
"alert": "This is awesome. It is awesome."
}
}' \
https://myexample.herokuapp.com/parse/push
In error logs, I have received like this.
2016-05-21T03:01:51.081259+00:00 app[web.1]: >
parse-server-example#1.4.0 start /app 2016-05-21T03:01:51.081265+00:00
app[web.1]: > node index.js 2016-05-21T03:01:51.081265+00:00
app[web.1]: 2016-05-21T03:01:52.581823+00:00 app[web.1]:
parse-server-example running on port 14168.
2016-05-21T03:01:52.698394+00:00 heroku[web.1]: State changed from
starting to up 2016-05-21T03:03:15.488214+00:00 heroku[router]:
at=error code=H13 desc="Connection closed without response"
method=POST path="/parse/push" host=myexample.herokuapp.com
request_id=0b5s4fbd-7258-4635-99a-178e37be15ce fwd="123.4.20.97"
dyno=web.1 connect=1ms service=11ms status=503 bytes=0
What do I need to set up in heroku?