[utils] Let request headers override standard headers

What was I thinking when writing this?

diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 16bc7408a74a535fa55a013866a096bec387d564..4ebdf6a784eaee0f02dd81268991c00a015b881a 100644 (file)
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -766,10 +766,9 @@ class YoutubeDLHandler(compat_urllib_request.HTTPHandler):
         return ret
 
     def http_request(self, req):
-        for h,v in std_headers.items():
-            if h in req.headers:
-                del req.headers[h]
-            req.add_header(h, v)
+        for h, v in std_headers.items():
+            if h not in req.headers:
+                req.add_header(h, v)
         if 'Youtubedl-no-compression' in req.headers:
             if 'Accept-encoding' in req.headers:
                 del req.headers['Accept-encoding']