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    Based on :class:`http.client.HTTPConnection` but provides an extra constructor
    backwards-compatibility layer between older and newer Pythons.

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    Accepted parameters include:

    - ``strict``: See the documentation on :class:`urllib3.connectionpool.HTTPConnectionPool`
    - ``source_address``: Set the source address for the current connection.
    - ``socket_options``: Set specific options on the underlying socket. If not specified, then
      defaults are loaded from ``HTTPConnection.default_socket_options`` which includes disabling
      Nagle's algorithm (sets TCP_NODELAY to 1) unless the connection is behind a proxy.

      For example, if you wish to enable TCP Keep Alive in addition to the defaults,
      you might pass:

      .. code-block:: python

         HTTPConnection.default_socket_options + [
             (socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1),
         ]

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