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Current File : //proc/thread-self/root/usr/lib/python2.7/site-packages/pip/_vendor/urllib3/poolmanager.pyc
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    Create a pool key out of a request context dictionary.

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    :param key_class:
        The class to use when constructing the key. This should be a namedtuple
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    :type  key_class: namedtuple
    :param request_context:
        A dictionary-like object that contain the context for a request.
    :type  request_context: dict

    :return: A namedtuple that can be used as a connection pool key.
    :rtype:  PoolKey
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    Allows for arbitrary requests while transparently keeping track of
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    :param num_pools:
        Number of connection pools to cache before discarding the least
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    :param headers:
        Headers to include with all requests, unless other headers are given
        explicitly.

    :param \**connection_pool_kw:
        Additional parameters are used to create fresh
        :class:`urllib3.connectionpool.ConnectionPool` instances.

    Example::

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

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        Create a new :class:`ConnectionPool` based on host, port, scheme, and
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        Empty our store of pools and direct them all to close.

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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`.

        If ``pool_kwargs`` is not provided and a new pool needs to be
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        the :class:`urllib3.connectionpool.ConnectionPool`. If ``pool_kwargs``
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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`
        with custom cross-host redirect logic and only sends the request-uri
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    Behaves just like :class:`PoolManager`, but sends all requests through
    the defined proxy, using the CONNECT method for HTTPS URLs.

    :param proxy_url:
        The URL of the proxy to be used.

    :param proxy_headers:
        A dictionary contaning headers that will be sent to the proxy. In case
        of HTTP they are being sent with each request, while in the
        HTTPS/CONNECT case they are sent only once. Could be used for proxy
        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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