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

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        Same as :meth:`urllib3.connectionpool.HTTPConnectionPool.urlopen`
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    Behaves just like :class:`PoolManager`, but sends all requests through
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    :param proxy_headers:
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        >>> r2 = proxy.request('GET', 'http://httpbin.org/')
        >>> len(proxy.pools)
        1
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        3

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