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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 _host():
 """Get the Host from the most recent HTTP request."""

    host_and_port = request.urlparts[1]
    try:
        host, _ = host_and_port.split(':')
    except ValueError:
        # No port yet. Host defaults to '127.0.0.1' in bottle.request.
        return DEFAULT_BIND
    return host or DEFAULT_BIND