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b20de505ab
This permits users to easily customize where the ip address
should be resolved. When fronting the application with a webserver or
load balancer, the ip address may be the server and not be the user.
E.g. consider the IP address is passed as the header: "X-Forwarded-For".
```ruby
class User
devise :trackable
protected
def extract_ip_from(request)
request.headers["X-Forwarded-For"]
end
end
```