How do I communicate between microservices? - node.js

Question

I have the following code in one microservices that calls another:
axios.get('http://localhost:4210/usermicroservice/heartbeat')
.then(function(resp) {
console.log('USER HEARTBEAT CALLED ')
})
.catch(function(error) {
console.log('USER HEARTBEAT ERROR ', error)
})
In the called microservice I have the following code:
server.use((req, res, next) => {
res.setHeader("Access-Control-Allow-Origin", "*");
next();
})
server.get('/usermicroservice/heartbeat', (req, res) => {
console.log('\n*** USER MICROSERVICE CALLED ***')
res.json({});
})
const PORT = 4210;
server.listen(PORT, () => {
console.log(`hsupp01 UserMicroservice server running on port: ${PORT}`)
})
I get the following error:
{ Error: connect ECONNREFUSED 127.0.0.1:4210
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1097:14)
errno: 'ECONNREFUSED',
code: 'ECONNREFUSED',
syscall: 'connect',
address: '127.0.0.1',
port: 4210,
I am able to accessed the called microservice from Postman using the same url:
http://localhost:4210/usermicroservice/heartbeat

Answer 1

The error message does not capture the problem but the code below had to be executed within an asynchronous block.
axios.get('http://localhost:4210/usermicroservice/heartbeat')
.then(function(resp) {
console.log('USER HEARTBEAT CALLED ')
})
.catch(function(error) {
console.log('USER HEARTBEAT ERROR ', error)
})