my question on stack overflow

Hello I have problem about restriction api key google, and the problem :

first I use the key restriction with

    "HTTP referrers (web sites)"

like :
1. mydomain.com/*
2. star.mydomain.com/star (star *)

and when I use api geocode with that restriction it's resulting:

> "API keys with referer restrictions cannot be used with this API."

and I search the solution I got from this link:
https://stackoverflow.com/questions/42167695/api-key-browser-api-keys-cannot-have-referer-restrictions-when-used-with-this-ap

it's said from a person:

> "You can change your restriction from a browser restriction to a
> server restriction by using IP addresses to restrict access, instead
> of browser referrers."

so I change restrictions from "HTTP referrers (web sites)" to "IP addresses (web servers, cron jobs, etc.)"

And resulting this:

> "This IP, site or mobile application is not authorized to use this API
> key. Request received from IP address xxx.xxx.xxx.xxx, with referer:
> https://m.mydomain.id/"

and I search the solution I got from this link:
https://stackoverflow.com/questions/21933247/this-ip-site-or-mobile-application-is-not-authorized-to-use-this-api-key

and it's said by mike20132013 "it requires the server key". And the other person said "There is no such thing as "Server Key" anymore."

the other person commnet as:

> "Include HTTP header "Referer:yourdomain.com" and this should fix the
> response issues."
> like Here's what I did, and it worked perfectly: var options = { url:
> url, headers:{ Referer:'xxx.herokuapp.com' } }; request.get(options,
> function(...

I'm using react-geocode and I don't know to do it

and I still confuse to resolve this issue from the second link, can somebody tell me the detail and up to date about this issue???

the other solution is use restrictions as none, but i won't do that.

other link's but still nothing:
1. https://stackoverflow.com/questions/23872909/this-site-or-ip-is-not-authorized-to-use-this-api-key

take a look this, I had do like this
https://stackblitz.com/edit/react-5bsr3p

Thanks for your help....