Some servers may reject requests if not sent (e.g. fingerprinting)
Fixes #3878
Authored by: coletdjnz
password=params.get('client_certificate_password'))
except ssl.SSLError:
raise YoutubeDLError('Unable to load client certificate')
+
+ # Some servers may reject requests if ALPN extension is not sent. See:
+ # https://github.com/python/cpython/issues/85140
+ # https://github.com/yt-dlp/yt-dlp/issues/3878
+ with contextlib.suppress(NotImplementedError):
+ context.set_alpn_protocols(['http/1.1'])
+
return YoutubeDLHTTPSHandler(params, context=context, **kwargs)