X-Git-Url: https://git.rapsys.eu/youtubedl/blobdiff_plain/cb32b5fcf6f680ea9caf47919b33779491b79038..f20df65b988286919956f8e934cbef6430a981ba:/youtube_dl/extractor/udemy.py

diff --git a/youtube_dl/extractor/udemy.py b/youtube_dl/extractor/udemy.py
index a719699..105826e 100644
--- a/youtube_dl/extractor/udemy.py
+++ b/youtube_dl/extractor/udemy.py
@@ -20,6 +20,7 @@ from ..utils import (
     sanitized_Request,
     try_get,
     unescapeHTML,
+    url_or_none,
     urlencode_postdata,
 )
 
@@ -121,7 +122,9 @@ class UdemyIE(InfoExtractor):
             raise ExtractorError(error_str, expected=True)
 
     def _download_webpage_handle(self, *args, **kwargs):
-        kwargs.setdefault('headers', {})['User-Agent'] = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/603.2.4 (KHTML, like Gecko) Version/10.1.1 Safari/603.2.4'
+        headers = kwargs.get('headers', {}).copy()
+        headers['User-Agent'] = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/603.2.4 (KHTML, like Gecko) Version/10.1.1 Safari/603.2.4'
+        kwargs['headers'] = headers
         return super(UdemyIE, self)._download_webpage_handle(
             *args, **compat_kwargs(kwargs))
 
@@ -265,8 +268,8 @@ class UdemyIE(InfoExtractor):
             if not isinstance(source_list, list):
                 return
             for source in source_list:
-                video_url = source.get('file') or source.get('src')
-                if not video_url or not isinstance(video_url, compat_str):
+                video_url = url_or_none(source.get('file') or source.get('src'))
+                if not video_url:
                     continue
                 if source.get('type') == 'application/x-mpegURL' or determine_ext(video_url) == 'm3u8':
                     formats.extend(self._extract_m3u8_formats(
@@ -293,8 +296,8 @@ class UdemyIE(InfoExtractor):
                     continue
                 if track.get('kind') != 'captions':
                     continue
-                src = track.get('src')
-                if not src or not isinstance(src, compat_str):
+                src = url_or_none(track.get('src'))
+                if not src:
                     continue
                 lang = track.get('language') or track.get(
                     'srclang') or track.get('label')
@@ -314,8 +317,8 @@ class UdemyIE(InfoExtractor):
             for cc in captions:
                 if not isinstance(cc, dict):
                     continue
-                cc_url = cc.get('url')
-                if not cc_url or not isinstance(cc_url, compat_str):
+                cc_url = url_or_none(cc.get('url'))
+                if not cc_url:
                     continue
                 lang = try_get(cc, lambda x: x['locale']['locale'], compat_str)
                 sub_dict = (automatic_captions if cc.get('source') == 'auto'