diff --git a/youtube_dl/extractor/generic.py b/youtube_dl/extractor/generic.py
index 5b22b6b5e..518b4f9de 100644
--- a/youtube_dl/extractor/generic.py
+++ b/youtube_dl/extractor/generic.py
@@ -105,7 +105,8 @@ class GenericIE(InfoExtractor):
                 'skip_download': True,  # infinite live stream
             },
             'expected_warnings': [
-                r'501.*Not Implemented'
+                r'501.*Not Implemented',
+                r'400.*Bad Request',
             ],
         },
         # Direct link with incorrect MIME type