From: Sergey M․ <dstftw@gmail.com>
Date: Mon, 17 Sep 2018 15:14:53 +0000 (+0700)
Subject: [udemy] Don't pollute default headers dict
X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=commitdiff_plain;h=c8f6ab8c38f8397b06028cdea2839d6e25e2c809;p=youtube-dl

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

diff --git a/youtube_dl/extractor/udemy.py b/youtube_dl/extractor/udemy.py
index 79c45f80e..105826e9b 100644
--- a/youtube_dl/extractor/udemy.py
+++ b/youtube_dl/extractor/udemy.py
@@ -122,7 +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))