Cannot send firebase push notification from lambda - node.js

Question

I am hoping someone can help me point my mistake here.
I am trying to send a firebase push notification through a lambda using the HTTP legacy endpoint
https://fcm.googleapis.com/fcm/send
I am following the guide from:
https://craigrussell.io/2019/03/send-firebase-fcm-push-notification-from-aws-lambda/
Here is my code:
const authHeader ='key=A****IV';
const deviceToken ='eut4****pm';
console.log('sending Push notification');
return new Promise((resolve, reject) => {
const options = {
host: 'fcm.googleapis.com',
path: '/fcm/send',
method: 'POST',
headers: {
'Authorization': authHeader,
'Content-Type': 'application/json',
},
};
const req = http.request(options, (res) => {
console.log('success');
resolve('success');
});
req.on('error', (e) => {
console.log('failuree' + e.message);
reject(e.message);
});
// const reqBody = '{"to":"' + deviceToken + '", "priority" : "high"}';
const reqBody = '{"to":"' + deviceToken + '", "priority": "high", "notification": {"title": "Test", "body": "Test"}}';
console.log(reqBody);
req.write(reqBody);
req.end();
});
};
I do not receive any push notification after this . Am i doing something wrong here?

Answer 1

I think the key point is that you use the http module. Actually, it works well when using https module on my side.
var https = require('https');
The complete code is as follows:
var https = require('https');
exports.handler = async(event) => {
const authHeader = 'key=AA***y';
const deviceToken = 'fG***-';
return new Promise((resolve, reject) => {
const options = {
host: 'fcm.googleapis.com',
path: '/fcm/send',
method: 'POST',
headers: {
'Authorization': authHeader,
'Content-Type': 'application/json',
},
};
console.log(options);
const req = https.request(options, (res) => {
console.log('success');
console.log(res.statusCode);
resolve('success');
});
req.on('error', (e) => {
console.log('failuree' + e.message);
reject(e.message);
});
// const reqBody = '{"to":"' + deviceToken + '", "priority" : "high"}';
const reqBody = '{"to":"' + deviceToken + '", "priority": "high", "notification": {"title": "Test", "body": "Test"}}';
console.log(reqBody);
req.write(reqBody);
req.end();
});
};
For more details, you can see the res field after http request, it will show statusCode 403 when you use http.