Fix Issue1595365 - Adding the req.headers after the un-redirect headers have
been added. This helps in accidental overwritting of User-Agent header to
default value. To preserve the old behavior, only headers not in unredirected
headers will be updated.
diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py
index 16d8125..6c6450f 100644
--- a/Lib/urllib/request.py
+++ b/Lib/urllib/request.py
@@ -1063,8 +1063,10 @@
raise URLError('no host given')
h = http_class(host, timeout=req.timeout) # will parse host:port
- headers = dict(req.headers)
- headers.update(req.unredirected_hdrs)
+
+ headers = dict(req.unredirected_hdrs)
+ headers.update(dict((k, v) for k, v in req.headers.items()
+ if k not in headers))
# TODO(jhylton): Should this be redesigned to handle
# persistent connections?