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    Create a pool key out of a request context dictionary.

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        Get a :class:`ConnectionPool` based on the request context.

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        Get a :class:`ConnectionPool` based on the provided pool key.

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        Similar to :func:`urllib3.connectionpool.connection_from_url`.

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N(t__name__t
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    Behaves just like :class:`PoolManager`, but sends all requests through
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    :param proxy_headers:
        A dictionary containing headers that will be sent to the proxy. In case
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