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Get a :class:`urllib3.connectionpool.ConnectionPool` based on the host, port, and scheme.
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Get a :class:`urllib3.connectionpool.ConnectionPool` based on the provided pool key.
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Behaves just like :class:`PoolManager`, but sends all requests through
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(Defaults to False) If set to True will forward requests to the HTTPS
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Example:
>>> proxy = urllib3.ProxyManager('http://localhost:3128/')
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