Martin Panter added the comment:
I suggest using setdefault() in urllib.request.AbstractHTTPHandler.do_open():
headers.setdefault("Connection", "close")
I am trying to work around a server that truncates its response when this
header is sent, and this change would allow me to specify
headers={"Connection", "Keep-Alive"} to get the same effect as dropping the
Connection header. This is also consistent with the way the other headers
(Accept-Encoding, User-Agent, Host) may be overridden.
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<http://bugs.python.org/issue12849>
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