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Thread-safe connection pool for one host.
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Only works in Python 2. This parameter is ignored in Python 3.
:param timeout:
Socket timeout in seconds for each individual connection. This can
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If set to True, no more than ``maxsize`` connections will be used at
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until a connection has been released. This is a useful side effect for
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Headers to include with all requests, unless other headers are given
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Retry configuration to use by default with requests in this pool.
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Parsed proxy URL, should not be used directly, instead, see
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A dictionary with proxy headers, should not be used directly,
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Additional parameters are used to create fresh :class:`urllib3.connection.HTTPConnection`,
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