Node.js not accepting connections on port 80

Question

I am running my node server on ubuntu with sudo node index.js Running curl http://localhost/health-check gives a response but if I use the public IP, it does not get any response

Running sudo netstat -ntlp

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       
PID/Program name
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      
59739/node

Running nmap -A -T4 myDomainName

Starting Nmap 7.01 ( https://nmap.org ) at 2017-11-22 12:32 UTC
Nmap scan report for myDomainName (IP address)
Host is up (0.0011s latency).
Not shown: 997 filtered ports
PORT    STATE  SERVICE VERSION
...
80/tcp  closed http
443/tcp closed https

Running nmap localhost

Starting Nmap 7.01 ( https://nmap.org ) at 2017-11-22 12:28 UTC
Nmap scan report for localhost (127.0.0.1)
Host is up (0.000062s latency).
Not shown: 997 closed ports
PORT     STATE SERVICE
22/tcp   open  ssh
80/tcp   open  http

Lastly sudo ufw status

To                         Action      From
--                         ------      ----
22                         ALLOW       Anywhere
80                         ALLOW       Anywhere
443                        ALLOW       Anywhere
80/tcp                     ALLOW       Anywhere
22 (v6)                    ALLOW       Anywhere (v6)
80 (v6)                    ALLOW       Anywhere (v6)
443 (v6)                   ALLOW       Anywhere (v6)
80/tcp (v6)                ALLOW       Anywhere (v6)

Port 80 is open on localhost but not open on the domain name/ public ip