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NTLM authenticating pool, contributed by erikcederstran
Issue #10, see: http://code.google.com/p/urllib3/issues/detail?id=10
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Implements an NTLM authentication version of an urllib3 connection pool
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authurl is a random URL on the server that is protected by NTLM.
user is the Windows user, probably in the DOMAIN\username format.
pw is the password for the user.
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