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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_ip(request):
 """ get the ip address from the request """

    if config.BEHIND_REVERSE_PROXY:
        ip_address = request.META.get(config.REVERSE_PROXY_HEADER, '')
        ip_address = ip_address.split(",", 1)[0].strip()
        if ip_address == '':
            ip_address = get_ip_address_from_request(request)
    else:
        ip_address = get_ip_address_from_request(request)
    return ip_address