[facebook] Bypass download rate limits (closes #21018)

diff --git a/youtube_dl/extractor/facebook.py b/youtube_dl/extractor/facebook.py
index a3dcdca3e2bd424bd7a24a800bdf457ec37a033f..a56f85c216177810e2ea217dd4309aee6a453b00 100644 (file)
--- a/youtube_dl/extractor/facebook.py
+++ b/youtube_dl/extractor/facebook.py
@@ -405,6 +405,11 @@ class FacebookIE(InfoExtractor):
         if not formats:
             raise ExtractorError('Cannot find video formats')
 
+        # Downloads with browser's User-Agent are rate limited. Working around
+        # with non-browser User-Agent.
+        for f in formats:
+            f.setdefault('http_headers', {})['User-Agent'] = 'facebookexternalhit/1.1'
+
         self._sort_formats(formats)
 
         video_title = self._html_search_regex(