Error: getaddrinfo ENOTFOUND restapi.demoqa.com

I am trying to send POST http://restapi.demoqa.com/customer/register. I am not able to connect the URL .

Both BOTH GET and POST request for this URL , facing the below issue .

“Error : getaddrinfo ENOTFOUND restapi.demoqa.com”.

Kindly suggest how this issue can be resolved ?

Is this something that system not able to identify where the URL is hosted / Port issues ?