Julia Dolgova added the comment:
I compared the behavior of IE and urllib.
I put different addresses to the <proxy bypass list> ("Do not use proxy server
for address beginning with" setting), made different requests through IE and
urllib and watched if the proxy was bypassed.
IE doesn't even make a forward dns lookup for the hosname given to check
whether it should bypass proxy, whereas urllib does.
For example:
proxy_bypass_list request IE bypasses proxy
urllib bypasses proxy
23.253.135.79 https://python.org/ no yes
151.101.76.223 https://docs.python.org/ no yes
ovinnik.canonical.com https://ubuntu.com/ no yes
compare_ie_urllib.txt - full report
----------
Added file: http://bugs.python.org/file46649/compare_ie_urllib.txt
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<http://bugs.python.org/issue29533>
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