Error: getaddrinfo ENOTFOUND

I have a simple Node.js bot that makes an HTTP request each second to a rest API.

If the returned data is right then I construct an URL where I HTTP POST.

Everything works alright but after ~4-5hrs of running I got this error

0|server   | error:  Error: getaddrinfo ENOTFOUND www.rest-api.com www.rest-api.com:443
0|server   |     at errnoException (dns.js:28:10)
0|server   |     at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:73:26)

Can someone explain to me why this has happened?

After I restart my server everything got working.

I'm using axios to make the http requests.

via Anderson