How to subscribe a HTTP endpoint to SNS in node js? - node.js

Question

I am trying to subscribe my endpoint to a topic (I am using an EC2 instance), I have tried visiting my endpoint in a browser (GET request) to call sns.subscribe but I am not receiving a POST request afterwards.
The response I get from calling sns.subscribe is this.
{ ResponseMetadata: { RequestId: 'xxxx-xxxx-xxxx-xxx-xxxx' },
SubscriptionArn: 'arn:aws:sns:topic_location:xxxx:topic_name:xxxx-xxxx-xxxx-xxx-xxxx' }
This is my code.
const express = require("express");
const AWS = require('aws-sdk');
const request = require('request')
const bodyParser = require('body-parser')
const app = express();
var SNS_TOPIC_ARN = "arn:aws:sns:topic_location:xxxx:topic_name";
// configure AWS
AWS.config.update({
'accessKeyId': 'mykey',
'secretAccessKey': 'mysecretkey',
"region":"myregion"
});
const sns = new AWS.SNS();
app.get('/', (req, res) => {
var params = {
Protocol: 'http', /* required */ //http , https ,application
TopicArn: SNS_TOPIC_ARN, /* required */ // topic you want to subscribe
Endpoint: 'http://ec2-xx-xx-xx-xxx.myregion.compute.amazonaws.com/:80', // the endpoint that you want to receive notifications.
ReturnSubscriptionArn: true //|| false
};
sns.subscribe(params, function (err, data) {
if (err) {
console.log(err);
} else {
console.log(data);
}
});
res.end();
});
app.use(bodyParser.urlencoded({ extended: false }))
app.use(bodyParser.json())
app.post('/', (req, res) => {
let body = ''
req.on('data', (chunk) => {
body += chunk.toString()
})
req.on('end', () => {
let payload = JSON.parse(body)
if (payload.Type === 'SubscriptionConfirmation') {
const promise = new Promise((resolve, reject) => {
const url = payload.SubscribeURL
request(url, (error, response) => {
if (!error && response.statusCode == 200) {
console.log('Yess! We have accepted the confirmation from AWS')
return resolve()
} else {
return reject()
}
})
})
promise.then(() => {
res.end("ok")
})
}
})
})
app.listen(80, process.env.IP, function(request, response){
console.log("## SERVER STARTED ##");
});

Answer 1

I had to remove my port number from the endpoint when calling sns.subscribe! My subscription has now been confirmed :D The new endpoint looks like this.
Endpoint: 'http://ec2-xx-xx-xx-xxx.myregion.compute.amazonaws.com/