Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/youtube.py (Python)

Code before:
                requested_clients.append(client)
        # Force deprioritization of _BROKEN_CLIENTS for format de-duplication
        requested_clients.extend(broken_clients)
        if not requested_clients:
            requested_clients = default

        if smuggled_data.get('is_music_url') or self.is_music_url(url):
            for requested_client in requested_clients:
                _, base_client, variant = _split_innertube_client(requested_client)
                music_client = f'{base_client}_music'
                if variant != 'music' and music_client in INNERTUBE_CLIENTS:
                    requested_clients.append(music_client)

        return orderedSet(requested_clients)

    def _invalid_player_response(self, pr, video_id):
        # YouTube may return a different video player response than expected.
        # See: https://github.com/TeamNewPipe/NewPipe/issues/8713
        if (pr_id := traverse_obj(pr, ('videoDetails', 'videoId'))) != video_id:
            return pr_id

    def _extract_player_responses(self, clients, video_id, webpage, master_ytcfg, smuggled_data):
        initial_pr = ignore_initial_response = None
        if webpage:
            if self.po_token:
                ignore_initial_response = True
            elif 'web' in clients:
                experiments = traverse_obj(master_ytcfg, (
                    'WEB_PLAYER_CONTEXT_CONFIGS', ..., 'serializedExperimentIds', {lambda x: x.split(',')}, ...))
                if all(x in experiments for x in self._POTOKEN_EXPERIMENTS):
                    self.report_warning(
                        'Webpage contains broken formats (poToken experiment detected). Ignoring initial player response')
                    ignore_initial_response = True
            initial_pr = self._search_json(
                self._YT_INITIAL_PLAYER_RESPONSE_RE, webpage, 'initial player response', video_id, fatal=False)

        prs = []
        if initial_pr and not self._invalid_player_response(initial_pr, video_id):
            # Android player_response does not have microFormats which are needed for
            # extraction of some data. So we return the initial_pr with formats
            # stripped out even if not requested by the user
            # See: https://github.com/yt-dlp/yt-dlp/issues/501
            prs.append({**initial_pr, 'streamingData': None})

        all_clients = set(clients)
        clients = clients[::-1]

        def append_client(*client_names):
            """ Append the first client name that exists but not already used """
            for client_name in client_names:
                actual_client = _split_innertube_client(client_name)[0]

Review comment (suggestion):
```suggestion
```

The initial response may still work? If it's for a session generated from a browser user should be passing cookies, so the visitor ID will match token that way. 

In other cases, player_skip=webpage should be passed

Code after:
        """External PO Token fetch stub"""

    @staticmethod
    def _is_agegated(player_response):
        if traverse_obj(player_response, ('playabilityStatus', 'desktopLegacyAgeGateReason')):
            return True

        reasons = traverse_obj(player_response, ('playabilityStatus', ('status', 'reason')))
        AGE_GATE_REASONS = (
            'confirm your age', 'age-restricted', 'inappropriate',  # reason
            'age_verification_required', 'age_check_required',  # status
        )
        return any(expected in reason for expected in AGE_GATE_REASONS for reason in reasons)

    @staticmethod
    def _is_unplayable(player_response):
        return traverse_obj(player_response, ('playabilityStatus', 'status')) == 'UNPLAYABLE'

    def _extract_player_response(self, client, video_id, master_ytcfg, player_ytcfg, player_url, initial_pr, visitor_data, data_sync_id, po_token):
        headers = self.generate_api_headers(
            ytcfg=player_ytcfg,
            default_client=client,
            visitor_data=visitor_data,
            session_index=self._extract_session_index(master_ytcfg, player_ytcfg),
            account_syncid=(
                self._data_sync_id_to_delegated_session_id(data_sync_id)
                or self._extract_account_syncid(master_ytcfg, initial_pr, player_ytcfg)
            ),
        )

        yt_query = {
            'videoId': video_id,
        }

        default_pp = traverse_obj(
            INNERTUBE_CLIENTS, (_split_innertube_client(client)[0], 'PLAYER_PARAMS', {str}))
        if player_params := self._configuration_arg('player_params', [default_pp], casesense=True)[0]:
            yt_query['params'] = player_params

        if po_token:
            yt_query['serviceIntegrityDimensions'] = {'poToken': po_token}

        sts = self._extract_signature_timestamp(video_id, player_url, master_ytcfg, fatal=False) if player_url else None
        yt_query.update(self._generate_player_context(sts))
        return self._extract_response(
            item_id=video_id, ep='player', query=yt_query,
            ytcfg=player_ytcfg, headers=headers, fatal=True,
            default_client=client,
            note='Downloading {} player API JSON'.format(client.replace('_', ' ').strip()),
        ) or None