Replace localhost with real domain name in reset password of Laravel 5

I am using the default resetting passwords in Laravel 5.4. The function words fine, and the email with reset password link is successfully sent/received.

However, it still not show the real domain but 'localhost' like something below:

http://localhost/password/reset/4c16a78f3c1216de566bc0689694980ac53555311d0214bbb73fbc72870a91f5

Could you tell me how to replace 'localhost' with domainname.com?

And is it OK to with 'http://' instead of 'https://' ?

via Chebli Mohamed