import six


def hostport(scheme, host, port):
    """
        Returns the host component, with a port specifcation if needed.
    """
    if (port, scheme) in [(80, "http"), (443, "https"), (80, b"http"), (443, b"https")]:
        return host
    else:
        if isinstance(host, six.binary_type):
            return b"%s:%d" % (host, port)
        else:
            return "%s:%d" % (host, port)