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    Create a pool key out of a request context dictionary.

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    :param request_context:
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    Allows for arbitrary requests while transparently keeping track of
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        Headers to include with all requests, unless other headers are given
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    :param \**connection_pool_kw:
        Additional parameters are used to create fresh
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    Example::

        >>> manager = PoolManager(num_pools=2)
        >>> r = manager.request('GET', 'http://google.com/')
        >>> r = manager.request('GET', 'http://google.com/mail')
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        2

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        Create a new :class:`ConnectionPool` based on host, port, scheme, and
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        Get a :class:`ConnectionPool` based on the host, port, and scheme.

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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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        Merge a dictionary of override values for self.connection_pool_kw.

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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:
        A dictionary contaning headers that will be sent to the proxy. In case
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        authentication.

    Example:
        >>> proxy = urllib3.ProxyManager('http://localhost:3128/')
        >>> r1 = proxy.request('GET', 'http://google.com/')
        >>> r2 = proxy.request('GET', 'http://httpbin.org/')
        >>> len(proxy.pools)
        1
        >>> r3 = proxy.request('GET', 'https://httpbin.org/')
        >>> r4 = proxy.request('GET', 'https://twitter.com/')
        >>> len(proxy.pools)
        3

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        Sets headers needed by proxies: specifically, the Accept and Host
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