Install Insomnia from https://insomnia.rest/. Open Insomnia and click on the New Request button.
Enter the request name, in my case Ipify. Ensure the request method is GET.
Enter the url - in my case https://api.ipify.org, in the URL bar.
To format the resonse, open the Query tab and enter format into the first new name field and json into the first new value field.
In Windows, when clicking Send, I get error "Error: Peer certificate cannot be authenticated with given CA certificates". In order to work, have to disable the certificates, in settings (settings > Validate SSL Certificates).