ean, in which case it controls whether we verify the
    server's TLS certificate, or a string, in which case it must be a
    path to a CA bundle to use.
:param proxies:
    (optional) The proxies dictionary to apply to the request.
:param cert:
    (optional) Any user-provided SSL certificate to be used for client
    authentication (a.k.a., mTLS).
:rtype:
    urllib3.ConnectionPool
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