[twitter:card] Generalize base API URL

youtube_dl/extractor/twitter.py

@@ -108,6 +108,8 @@ class TwitterCardIE(TwitterBaseIE):
         },
     ]
 
+    _API_BASE = 'https://api.twitter.com/1.1'
+
     def _parse_media_info(self, media_info, video_id):
         formats = []
         for media_variant in media_info.get('variants', []):
@@ -149,7 +151,7 @@ class TwitterCardIE(TwitterBaseIE):
             main_script, 'bearer token')
         # https://developer.twitter.com/en/docs/tweets/post-and-engage/api-reference/get-statuses-show-id
         api_data = self._download_json(
-            'https://api.twitter.com/1.1/statuses/show/%s.json' % video_id,
+            '%s/statuses/show/%s.json' % (self._API_BASE, video_id),
             video_id, 'Downloading API data',
             headers={
                 'Authorization': 'Bearer ' + bearer_token,
@@ -237,13 +239,13 @@ class TwitterCardIE(TwitterBaseIE):
             if ct0:
                 headers['csrf_token'] = ct0.value
             guest_token = self._download_json(
-                'https://api.twitter.com/1.1/guest/activate.json', video_id,
+                '%s/guest/activate.json' % self._API_BASE, video_id,
                 'Downloading guest token', data=b'',
                 headers=headers)['guest_token']
             headers['x-guest-token'] = guest_token
             self._set_cookie('api.twitter.com', 'gt', guest_token)
             config = self._download_json(
-                'https://api.twitter.com/1.1/videos/tweet/config/%s.json' % video_id,
+                '%s/videos/tweet/config/%s.json' % (self._API_BASE, video_id),
                 video_id, headers=headers)
             track = config['track']
             vmap_url = track.get('vmapUrl')