[Hotstar] Add referer for subs (#1062)

Authored by: Ashish0804

yt_dlp/YoutubeDL.py

@@ -2594,7 +2594,9 @@ class YoutubeDL(object):
                             return
                     else:
                         try:
-                            self.dl(sub_filename, sub_info.copy(), subtitle=True)
+                            sub_copy = sub_info.copy()
+                            sub_copy.setdefault('http_headers', info_dict.get('http_headers'))
+                            self.dl(sub_filename, sub_copy, subtitle=True)
                             sub_info['filepath'] = sub_filename
                             files_to_move[sub_filename] = sub_filename_final
                         except (ExtractorError, IOError, OSError, ValueError) + network_exceptions as err:

yt_dlp/extractor/hotstar.py

@@ -254,6 +254,9 @@ class HotStarIE(HotStarBaseIE):
             'season_id': video_data.get('seasonId'),
             'episode': title,
             'episode_number': int_or_none(video_data.get('episodeNo')),
+            'http_headers': {
+                'Referer': 'https://www.hotstar.com/in',
+            }
         }