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Based on httplib.HTTPConnection but provides an extra constructor
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- ``strict``: See the documentation on :class:`urllib3.connectionpool.HTTPConnectionPool`
- ``source_address``: Set the source address for the current connection.
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For example, if you wish to enable TCP Keep Alive in addition to the defaults,
you might pass::
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servers may not expect to receive the trailing dot when provided.
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lookup with the trailing dot will properly only resolve the appropriate FQDN,
whereas a lookup without a trailing dot will search the system's search domain
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