We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Cannot download certain Cartoon Network videos?
## Please follow the guide below

- You will be asked some questions and requested to provide some information, please read them **carefully** and answer honestly
- Put an `x` into all the boxes [ ] relevant to your *issue* (like this: `[x]`)
- Use the *Preview* tab to see what your issue will actually look like

---

### Make sure you are using the *latest* version: run `youtube-dl --version` and ensure your version is *2017.10.29*. If it's not, read [this FAQ entry](https://github.com/rg3/youtube-dl/blob/master/README.md#how-do-i-update-youtube-dl) and update. Issues with outdated version will be rejected.
- [x] I've **verified** and **I assure** that I'm running youtube-dl **2017.10.29**

### Before submitting an *issue* make sure you have:
- [x] At least skimmed through the [README](https://github.com/rg3/youtube-dl/blob/master/README.md), **most notably** the [FAQ](https://github.com/rg3/youtube-dl#faq) and [BUGS](https://github.com/rg3/youtube-dl#bugs) sections
- [x] [Searched](https://github.com/rg3/youtube-dl/search?type=Issues) the bugtracker for similar issues including closed ones

### What is the purpose of your *issue*?
- [x] Bug report (encountered problems with youtube-dl)
- [ ] Site support request (request for adding support for a new site)
- [ ] Feature request (request for a new functionality)
- [ ] Question
- [ ] Other

---

### The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your *issue*

---

### If the purpose of this *issue* is a *bug report*, *site support request* or you are not completely sure provide the full verbose output as follows:

Add the `-v` flag to **your command line** you run youtube-dl with (`youtube-dl -v <your command line>`), copy the **whole** output and insert it here. It should look similar to one below (replace it with **your** log inserted between triple ```):

```
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['http://www.cartoonnetwork.com/video/regularshow/fre
e-cake-episode.html', '-v']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2017.10.29
[debug] Python version 3.4.4 - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg N-62162-gec8789a, ffprobe 3.2.4, rtmpdump 2.4
[debug] Proxy map: {}
[CartoonNetwork] free-cake: Downloading webpage
[CartoonNetwork] 42de6efafe3f038ba941f061981bb5b287521da0: Downloading XML
[CartoonNetwork] 42de6efafe3f038ba941f061981bb5b287521da0: Downloading f4m manif
est
WARNING: Unable to download f4m manifest: HTTP Error 403: Forbidden
[CartoonNetwork] 42de6efafe3f038ba941f061981bb5b287521da0: Downloading XML
ERROR: UNKNOWN
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpk63cqkyt\bu
ild\youtube_dl\YoutubeDL.py", line 784, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpk63cqkyt\bu
ild\youtube_dl\extractor\common.py", line 434, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpk63cqkyt\bu
ild\youtube_dl\extractor\cartoonnetwork.py", line 41, in _real_extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpk63cqkyt\bu
ild\youtube_dl\extractor\turner.py", line 84, in _extract_cvp_info
youtube_dl.utils.ExtractorError: UNKNOWN
```

---

### If the purpose of this *issue* is a *site support request* please provide all kinds of example URLs support for which should be included (replace following example URLs by **yours**):
- Single video: http://www.cartoonnetwork.com/video/regularshow/free-cake-episode.html

Note that **youtube-dl does not support sites dedicated to [copyright infringement](https://github.com/rg3/youtube-dl#can-you-add-support-for-this-anime-video-site-or-site-which-shows-current-movies-for-free)**. In order for site support request to be accepted all provided example URLs should not violate any copyrights.

---

### Description of your *issue*, suggested solution and other information

I'm trying to download a particular video and for some reason I can't. Other Cartoon Network videos work just fine, but this series(?) doesn't seem to work. I'm not sure why some work, but some don't. I'm probably missing something... Help please?

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `youtube_dl/extractor/cartoonnetwork.py`
Content:
```
1 # coding: utf-8
2 from __future__ import unicode_literals
3 
4 import re
5 
6 from .turner import TurnerBaseIE
7 
8 
9 class CartoonNetworkIE(TurnerBaseIE):
10     _VALID_URL = r'https?://(?:www\.)?cartoonnetwork\.com/video/(?:[^/]+/)+(?P<id>[^/?#]+)-(?:clip|episode)\.html'
11     _TEST = {
12         'url': 'http://www.cartoonnetwork.com/video/teen-titans-go/starfire-the-cat-lady-clip.html',
13         'info_dict': {
14             'id': '8a250ab04ed07e6c014ef3f1e2f9016c',
15             'ext': 'mp4',
16             'title': 'Starfire the Cat Lady',
17             'description': 'Robin decides to become a cat so that Starfire will finally love him.',
18         },
19         'params': {
20             # m3u8 download
21             'skip_download': True,
22         },
23     }
24 
25     def _real_extract(self, url):
26         display_id = self._match_id(url)
27         webpage = self._download_webpage(url, display_id)
28         id_type, video_id = re.search(r"_cnglobal\.cvp(Video|Title)Id\s*=\s*'([^']+)';", webpage).groups()
29         query = ('id' if id_type == 'Video' else 'titleId') + '=' + video_id
30         return self._extract_cvp_info(
31             'http://www.cartoonnetwork.com/video-seo-svc/episodeservices/getCvpPlaylist?networkName=CN2&' + query, video_id, {
32                 'secure': {
33                     'media_src': 'http://androidhls-secure.cdn.turner.com/toon/big',
34                     'tokenizer_src': 'http://www.cartoonnetwork.com/cntv/mvpd/processors/services/token_ipadAdobe.do',
35                 },
36             }, {
37                 'url': url,
38                 'site_name': 'CartoonNetwork',
39                 'auth_required': self._search_regex(
40                     r'_cnglobal\.cvpFullOrPreviewAuth\s*=\s*(true|false);',
41                     webpage, 'auth required', default='false') == 'true',
42             })
43
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/youtube_dl/extractor/cartoonnetwork.py b/youtube_dl/extractor/cartoonnetwork.py
--- a/youtube_dl/extractor/cartoonnetwork.py
+++ b/youtube_dl/extractor/cartoonnetwork.py
@@ -31,7 +31,7 @@
             'http://www.cartoonnetwork.com/video-seo-svc/episodeservices/getCvpPlaylist?networkName=CN2&' + query, video_id, {
                 'secure': {
                     'media_src': 'http://androidhls-secure.cdn.turner.com/toon/big',
-                    'tokenizer_src': 'http://www.cartoonnetwork.com/cntv/mvpd/processors/services/token_ipadAdobe.do',
+                    'tokenizer_src': 'https://token.vgtf.net/token/token_mobile',
                 },
             }, {
                 'url': url,

{"golden_diff": "diff --git a/youtube_dl/extractor/cartoonnetwork.py b/youtube_dl/extractor/cartoonnetwork.py\n--- a/youtube_dl/extractor/cartoonnetwork.py\n+++ b/youtube_dl/extractor/cartoonnetwork.py\n@@ -31,7 +31,7 @@\n             'http://www.cartoonnetwork.com/video-seo-svc/episodeservices/getCvpPlaylist?networkName=CN2&' + query, video_id, {\n                 'secure': {\n                     'media_src': 'http://androidhls-secure.cdn.turner.com/toon/big',\n-                    'tokenizer_src': 'http://www.cartoonnetwork.com/cntv/mvpd/processors/services/token_ipadAdobe.do',\n+                    'tokenizer_src': 'https://token.vgtf.net/token/token_mobile',\n                 },\n             }, {\n                 'url': url,\n", "issue": "Cannot download certain Cartoon Network videos?\n## Please follow the guide below\r\n\r\n- You will be asked some questions and requested to provide some information, please read them **carefully** and answer honestly\r\n- Put an `x` into all the boxes [ ] relevant to your *issue* (like this: `[x]`)\r\n- Use the *Preview* tab to see what your issue will actually look like\r\n\r\n---\r\n\r\n### Make sure you are using the *latest* version: run `youtube-dl --version` and ensure your version is *2017.10.29*. If it's not, read [this FAQ entry](https://github.com/rg3/youtube-dl/blob/master/README.md#how-do-i-update-youtube-dl) and update. Issues with outdated version will be rejected.\r\n- [x] I've **verified** and **I assure** that I'm running youtube-dl **2017.10.29**\r\n\r\n### Before submitting an *issue* make sure you have:\r\n- [x] At least skimmed through the [README](https://github.com/rg3/youtube-dl/blob/master/README.md), **most notably** the [FAQ](https://github.com/rg3/youtube-dl#faq) and [BUGS](https://github.com/rg3/youtube-dl#bugs) sections\r\n- [x] [Searched](https://github.com/rg3/youtube-dl/search?type=Issues) the bugtracker for similar issues including closed ones\r\n\r\n### What is the purpose of your *issue*?\r\n- [x] Bug report (encountered problems with youtube-dl)\r\n- [ ] Site support request (request for adding support for a new site)\r\n- [ ] Feature request (request for a new functionality)\r\n- [ ] Question\r\n- [ ] Other\r\n\r\n---\r\n\r\n### The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your *issue*\r\n\r\n---\r\n\r\n### If the purpose of this *issue* is a *bug report*, *site support request* or you are not completely sure provide the full verbose output as follows:\r\n\r\nAdd the `-v` flag to **your command line** you run youtube-dl with (`youtube-dl -v <your command line>`), copy the **whole** output and insert it here. It should look similar to one below (replace it with **your** log inserted between triple ```):\r\n\r\n```\r\n[debug] System config: []\r\n[debug] User config: []\r\n[debug] Custom config: []\r\n[debug] Command-line args: ['http://www.cartoonnetwork.com/video/regularshow/fre\r\ne-cake-episode.html', '-v']\r\n[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252\r\n[debug] youtube-dl version 2017.10.29\r\n[debug] Python version 3.4.4 - Windows-7-6.1.7601-SP1\r\n[debug] exe versions: ffmpeg N-62162-gec8789a, ffprobe 3.2.4, rtmpdump 2.4\r\n[debug] Proxy map: {}\r\n[CartoonNetwork] free-cake: Downloading webpage\r\n[CartoonNetwork] 42de6efafe3f038ba941f061981bb5b287521da0: Downloading XML\r\n[CartoonNetwork] 42de6efafe3f038ba941f061981bb5b287521da0: Downloading f4m manif\r\nest\r\nWARNING: Unable to download f4m manifest: HTTP Error 403: Forbidden\r\n[CartoonNetwork] 42de6efafe3f038ba941f061981bb5b287521da0: Downloading XML\r\nERROR: UNKNOWN\r\nTraceback (most recent call last):\r\n  File \"C:\\Users\\dst\\AppData\\Roaming\\Build archive\\youtube-dl\\rg3\\tmpk63cqkyt\\bu\r\nild\\youtube_dl\\YoutubeDL.py\", line 784, in extract_info\r\n  File \"C:\\Users\\dst\\AppData\\Roaming\\Build archive\\youtube-dl\\rg3\\tmpk63cqkyt\\bu\r\nild\\youtube_dl\\extractor\\common.py\", line 434, in extract\r\n  File \"C:\\Users\\dst\\AppData\\Roaming\\Build archive\\youtube-dl\\rg3\\tmpk63cqkyt\\bu\r\nild\\youtube_dl\\extractor\\cartoonnetwork.py\", line 41, in _real_extract\r\n  File \"C:\\Users\\dst\\AppData\\Roaming\\Build archive\\youtube-dl\\rg3\\tmpk63cqkyt\\bu\r\nild\\youtube_dl\\extractor\\turner.py\", line 84, in _extract_cvp_info\r\nyoutube_dl.utils.ExtractorError: UNKNOWN\r\n```\r\n\r\n---\r\n\r\n### If the purpose of this *issue* is a *site support request* please provide all kinds of example URLs support for which should be included (replace following example URLs by **yours**):\r\n- Single video: http://www.cartoonnetwork.com/video/regularshow/free-cake-episode.html\r\n\r\nNote that **youtube-dl does not support sites dedicated to [copyright infringement](https://github.com/rg3/youtube-dl#can-you-add-support-for-this-anime-video-site-or-site-which-shows-current-movies-for-free)**. In order for site support request to be accepted all provided example URLs should not violate any copyrights.\r\n\r\n---\r\n\r\n### Description of your *issue*, suggested solution and other information\r\n\r\nI'm trying to download a particular video and for some reason I can't. Other Cartoon Network videos work just fine, but this series(?) doesn't seem to work. I'm not sure why some work, but some don't. I'm probably missing something... Help please?\n", "before_files": [{"content": "# coding: utf-8\nfrom __future__ import unicode_literals\n\nimport re\n\nfrom .turner import TurnerBaseIE\n\n\nclass CartoonNetworkIE(TurnerBaseIE):\n    _VALID_URL = r'https?://(?:www\\.)?cartoonnetwork\\.com/video/(?:[^/]+/)+(?P<id>[^/?#]+)-(?:clip|episode)\\.html'\n    _TEST = {\n        'url': 'http://www.cartoonnetwork.com/video/teen-titans-go/starfire-the-cat-lady-clip.html',\n        'info_dict': {\n            'id': '8a250ab04ed07e6c014ef3f1e2f9016c',\n            'ext': 'mp4',\n            'title': 'Starfire the Cat Lady',\n            'description': 'Robin decides to become a cat so that Starfire will finally love him.',\n        },\n        'params': {\n            # m3u8 download\n            'skip_download': True,\n        },\n    }\n\n    def _real_extract(self, url):\n        display_id = self._match_id(url)\n        webpage = self._download_webpage(url, display_id)\n        id_type, video_id = re.search(r\"_cnglobal\\.cvp(Video|Title)Id\\s*=\\s*'([^']+)';\", webpage).groups()\n        query = ('id' if id_type == 'Video' else 'titleId') + '=' + video_id\n        return self._extract_cvp_info(\n            'http://www.cartoonnetwork.com/video-seo-svc/episodeservices/getCvpPlaylist?networkName=CN2&' + query, video_id, {\n                'secure': {\n                    'media_src': 'http://androidhls-secure.cdn.turner.com/toon/big',\n                    'tokenizer_src': 'http://www.cartoonnetwork.com/cntv/mvpd/processors/services/token_ipadAdobe.do',\n                },\n            }, {\n                'url': url,\n                'site_name': 'CartoonNetwork',\n                'auth_required': self._search_regex(\n                    r'_cnglobal\\.cvpFullOrPreviewAuth\\s*=\\s*(true|false);',\n                    webpage, 'auth required', default='false') == 'true',\n            })\n", "path": "youtube_dl/extractor/cartoonnetwork.py"}], "after_files": [{"content": "# coding: utf-8\nfrom __future__ import unicode_literals\n\nimport re\n\nfrom .turner import TurnerBaseIE\n\n\nclass CartoonNetworkIE(TurnerBaseIE):\n    _VALID_URL = r'https?://(?:www\\.)?cartoonnetwork\\.com/video/(?:[^/]+/)+(?P<id>[^/?#]+)-(?:clip|episode)\\.html'\n    _TEST = {\n        'url': 'http://www.cartoonnetwork.com/video/teen-titans-go/starfire-the-cat-lady-clip.html',\n        'info_dict': {\n            'id': '8a250ab04ed07e6c014ef3f1e2f9016c',\n            'ext': 'mp4',\n            'title': 'Starfire the Cat Lady',\n            'description': 'Robin decides to become a cat so that Starfire will finally love him.',\n        },\n        'params': {\n            # m3u8 download\n            'skip_download': True,\n        },\n    }\n\n    def _real_extract(self, url):\n        display_id = self._match_id(url)\n        webpage = self._download_webpage(url, display_id)\n        id_type, video_id = re.search(r\"_cnglobal\\.cvp(Video|Title)Id\\s*=\\s*'([^']+)';\", webpage).groups()\n        query = ('id' if id_type == 'Video' else 'titleId') + '=' + video_id\n        return self._extract_cvp_info(\n            'http://www.cartoonnetwork.com/video-seo-svc/episodeservices/getCvpPlaylist?networkName=CN2&' + query, video_id, {\n                'secure': {\n                    'media_src': 'http://androidhls-secure.cdn.turner.com/toon/big',\n                    'tokenizer_src': 'https://token.vgtf.net/token/token_mobile',\n                },\n            }, {\n                'url': url,\n                'site_name': 'CartoonNetwork',\n                'auth_required': self._search_regex(\n                    r'_cnglobal\\.cvpFullOrPreviewAuth\\s*=\\s*(true|false);',\n                    webpage, 'auth required', default='false') == 'true',\n            })\n", "path": "youtube_dl/extractor/cartoonnetwork.py"}]}