Marc Schlaich added the comment:

Julia, could you please add other major browsers/HTTP clients (Firefox, Chrome, 
curl, ...) to your comparison (compare_ie_urllib.txt). I would expect that 
Python/urllib is the only implementation doing DNS requests for proxy bypass 

Please note that curl uses the `no_proxy` environment variable, so the syntax 
is slightly different.

For anyone who doesn't fully grasp the details of this issue, there might be a 
better explanation at


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