How to use the daphne.utils.parse_x_forwarded_for function in daphne

def test_no_original(self):
        headers = {}
        self.assertEqual(parse_x_forwarded_for(headers), (None, None))

def test_address_only(self):
        headers = Headers({b"X-Forwarded-For": [b"10.1.2.3"]})
        self.assertEqual(parse_x_forwarded_for(headers), (["10.1.2.3", 0], None))

def test_multiple_proxys(self):
        headers = Headers({b"X-Forwarded-For": [b"10.1.2.3, 10.1.2.4"]})
        self.assertEqual(parse_x_forwarded_for(headers), (["10.1.2.3", 0], None))

def test_original(self):
        headers = Headers({})
        self.assertEqual(
            parse_x_forwarded_for(headers, original_addr=["127.0.0.1", 80]),
            (["127.0.0.1", 80], None),
        )

def test_basic(self):
        headers = {
            b"X-Forwarded-For": b"10.1.2.3",
            b"X-Forwarded-Port": b"1234",
            b"X-Forwarded-Proto": b"https",
        }
        self.assertEqual(parse_x_forwarded_for(headers), (["10.1.2.3", 1234], "https"))

def test_multiple_proxies(self):
        headers = {b"X-Forwarded-For": b"10.1.2.3, 10.1.2.4"}
        self.assertEqual(parse_x_forwarded_for(headers), (["10.1.2.3", 0], None))

def test_v6_address(self):
        headers = {b"X-Forwarded-For": [b"1043::a321:0001, 10.0.5.6"]}
        self.assertEqual(parse_x_forwarded_for(headers), (["1043::a321:0001", 0], None))

def test_address_only(self):
        headers = {b"X-Forwarded-For": b"10.1.2.3"}
        self.assertEqual(parse_x_forwarded_for(headers), (["10.1.2.3", 0], None))

def test_basic(self):
        headers = Headers(
            {
                b"X-Forwarded-For": [b"10.1.2.3"],
                b"X-Forwarded-Port": [b"1234"],
                b"X-Forwarded-Proto": [b"https"],
            }
        )
        result = parse_x_forwarded_for(headers)
        self.assertEqual(result, (["10.1.2.3", 1234], "https"))
        self.assertIsInstance(result[0][0], str)
        self.assertIsInstance(result[1], str)

# Prevent CVE-2015-0219
                if b"_" in name:
                    continue
                self.clean_headers.append((name.lower(), value.encode("latin1")))
            # Get client address if possible
            peer = self.transport.getPeer()
            host = self.transport.getHost()
            if hasattr(peer, "host") and hasattr(peer, "port"):
                self.client_addr = [str(peer.host), peer.port]
                self.server_addr = [str(host.host), host.port]
            else:
                self.client_addr = None
                self.server_addr = None

            if self.server.proxy_forwarded_address_header:
                self.client_addr, self.client_scheme = parse_x_forwarded_for(
                    dict(self.clean_headers),
                    self.server.proxy_forwarded_address_header,
                    self.server.proxy_forwarded_port_header,
                    self.server.proxy_forwarded_proto_header,
                    self.client_addr,
                )
            # Decode websocket subprotocol options
            subprotocols = []
            for header, value in self.clean_headers:
                if header == b"sec-websocket-protocol":
                    subprotocols = [
                        x.strip() for x in unquote(value.decode("ascii")).split(",")
                    ]
            # Make new application instance with scope
            self.path = request.path.encode("ascii")
            self.application_deferred = defer.maybeDeferred(