From: Sergey M․ <dstftw@gmail.com>
Date: Mon, 17 Sep 2018 15:14:28 +0000 (+0700)
Subject: [twitch] Don't pollute default headers dict
X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=commitdiff_plain;h=e2f61598be49b75f16b501f7a4d24f4c8c230c49;p=youtube-dl

[twitch] Don't pollute default headers dict
---

diff --git a/youtube_dl/extractor/twitch.py b/youtube_dl/extractor/twitch.py
index 26661fdf6..401615683 100644
--- a/youtube_dl/extractor/twitch.py
+++ b/youtube_dl/extractor/twitch.py
@@ -51,7 +51,9 @@ class TwitchBaseIE(InfoExtractor):
                 expected=True)
 
     def _call_api(self, path, item_id, *args, **kwargs):
-        kwargs.setdefault('headers', {})['Client-ID'] = self._CLIENT_ID
+        headers = kwargs.get('headers', {}).copy()
+        headers['Client-ID'] = self._CLIENT_ID
+        kwargs['headers'] = headers
         response = self._download_json(
             '%s/%s' % (self._API_BASE, path), item_id,
             *args, **compat_kwargs(kwargs))