Delete swarm_client.

swarm_client/third_party/requests/packages/urllib3/connectionpool.py

Index: swarm_client/third_party/requests/packages/urllib3/connectionpool.py
===================================================================
--- swarm_client/third_party/requests/packages/urllib3/connectionpool.py	(revision 235167)
+++ swarm_client/third_party/requests/packages/urllib3/connectionpool.py	(working copy)
@@ -1,745 +0,0 @@
-# urllib3/connectionpool.py
-# Copyright 2008-2013 Andrey Petrov and contributors (see CONTRIBUTORS.txt)
-#
-# This module is part of urllib3 and is released under
-# the MIT License: http://www.opensource.org/licenses/mit-license.php
-
-import errno
-import logging
-
-from socket import error as SocketError, timeout as SocketTimeout
-import socket
-
-try: # Python 3
-    from http.client import HTTPConnection, HTTPException
-    from http.client import HTTP_PORT, HTTPS_PORT
-except ImportError:
-    from httplib import HTTPConnection, HTTPException
-    from httplib import HTTP_PORT, HTTPS_PORT
-
-try: # Python 3
-    from queue import LifoQueue, Empty, Full
-except ImportError:
-    from Queue import LifoQueue, Empty, Full
-    import Queue as _  # Platform-specific: Windows
-
-
-try: # Compiled with SSL?
-    HTTPSConnection = object
-
-    class BaseSSLError(BaseException):
-        pass
-
-    ssl = None
-
-    try: # Python 3
-        from http.client import HTTPSConnection
-    except ImportError:
-        from httplib import HTTPSConnection
-
-    import ssl
-    BaseSSLError = ssl.SSLError
-
-except (ImportError, AttributeError): # Platform-specific: No SSL.
-    pass
-
-
-from .exceptions import (
-    ClosedPoolError,
-    ConnectTimeoutError,
-    EmptyPoolError,
-    HostChangedError,
-    MaxRetryError,
-    SSLError,
-    ReadTimeoutError,
-    ProxyError,
-)
-from .packages.ssl_match_hostname import CertificateError, match_hostname
-from .packages import six
-from .request import RequestMethods
-from .response import HTTPResponse
-from .util import (
-    assert_fingerprint,
-    get_host,
-    is_connection_dropped,
-    resolve_cert_reqs,
-    resolve_ssl_version,
-    ssl_wrap_socket,
-    Timeout,
-)
-
-xrange = six.moves.xrange
-
-log = logging.getLogger(__name__)
-
-_Default = object()
-
-port_by_scheme = {
-    'http': HTTP_PORT,
-    'https': HTTPS_PORT,
-}
-
-
-## Connection objects (extension of httplib)
-
-class VerifiedHTTPSConnection(HTTPSConnection):
-    """
-    Based on httplib.HTTPSConnection but wraps the socket with
-    SSL certification.
-    """
-    cert_reqs = None
-    ca_certs = None
-    ssl_version = None
-
-    def set_cert(self, key_file=None, cert_file=None,
-                 cert_reqs=None, ca_certs=None,
-                 assert_hostname=None, assert_fingerprint=None):
-
-        self.key_file = key_file
-        self.cert_file = cert_file
-        self.cert_reqs = cert_reqs
-        self.ca_certs = ca_certs
-        self.assert_hostname = assert_hostname
-        self.assert_fingerprint = assert_fingerprint
-
-    def connect(self):
-        # Add certificate verification
-        try:
-            sock = socket.create_connection(
-                address=(self.host, self.port),
-                timeout=self.timeout)
-        except SocketTimeout:
-                raise ConnectTimeoutError(
-                    self, "Connection to %s timed out. (connect timeout=%s)" %
-                    (self.host, self.timeout))
-
-        resolved_cert_reqs = resolve_cert_reqs(self.cert_reqs)
-        resolved_ssl_version = resolve_ssl_version(self.ssl_version)
-
-        if self._tunnel_host:
-            self.sock = sock
-            # Calls self._set_hostport(), so self.host is
-            # self._tunnel_host below.
-            self._tunnel()
-
-        # Wrap socket using verification with the root certs in
-        # trusted_root_certs
-        self.sock = ssl_wrap_socket(sock, self.key_file, self.cert_file,
-                                    cert_reqs=resolved_cert_reqs,
-                                    ca_certs=self.ca_certs,
-                                    server_hostname=self.host,
-                                    ssl_version=resolved_ssl_version)
-
-        if resolved_cert_reqs != ssl.CERT_NONE:
-            if self.assert_fingerprint:
-                assert_fingerprint(self.sock.getpeercert(binary_form=True),
-                                   self.assert_fingerprint)
-            elif self.assert_hostname is not False:
-                match_hostname(self.sock.getpeercert(),
-                               self.assert_hostname or self.host)
-
-
-## Pool objects
-
-class ConnectionPool(object):
-    """
-    Base class for all connection pools, such as
-    :class:`.HTTPConnectionPool` and :class:`.HTTPSConnectionPool`.
-    """
-
-    scheme = None
-    QueueCls = LifoQueue
-
-    def __init__(self, host, port=None):
-        # httplib doesn't like it when we include brackets in ipv6 addresses
-        host = host.strip('[]')
-
-        self.host = host
-        self.port = port
-
-    def __str__(self):
-        return '%s(host=%r, port=%r)' % (type(self).__name__,
-                                         self.host, self.port)
-
-# This is taken from http://hg.python.org/cpython/file/7aaba721ebc0/Lib/socket.py#l252
-_blocking_errnos = set([errno.EAGAIN, errno.EWOULDBLOCK])
-
-class HTTPConnectionPool(ConnectionPool, RequestMethods):
-    """
-    Thread-safe connection pool for one host.
-
-    :param host:
-        Host used for this HTTP Connection (e.g. "localhost"), passed into
-        :class:`httplib.HTTPConnection`.
-
-    :param port:
-        Port used for this HTTP Connection (None is equivalent to 80), passed
-        into :class:`httplib.HTTPConnection`.
-
-    :param strict:
-        Causes BadStatusLine to be raised if the status line can't be parsed
-        as a valid HTTP/1.0 or 1.1 status line, passed into
-        :class:`httplib.HTTPConnection`.
-
-        .. note::
-           Only works in Python 2. This parameter is ignored in Python 3.
-
-    :param timeout:
-        Socket timeout in seconds for each individual connection. This can
-        be a float or integer, which sets the timeout for the HTTP request,
-        or an instance of :class:`urllib3.util.Timeout` which gives you more
-        fine-grained control over request timeouts. After the constructor has
-        been parsed, this is always a `urllib3.util.Timeout` object.
-
-    :param maxsize:
-        Number of connections to save that can be reused. More than 1 is useful
-        in multithreaded situations. If ``block`` is set to false, more
-        connections will be created but they will not be saved once they've
-        been used.
-
-    :param block:
-        If set to True, no more than ``maxsize`` connections will be used at
-        a time. When no free connections are available, the call will block
-        until a connection has been released. This is a useful side effect for
-        particular multithreaded situations where one does not want to use more
-        than maxsize connections per host to prevent flooding.
-
-    :param headers:
-        Headers to include with all requests, unless other headers are given
-        explicitly.
-
-    :param _proxy:
-        Parsed proxy URL, should not be used directly, instead, see
-        :class:`urllib3.connectionpool.ProxyManager`"
-
-    :param _proxy_headers:
-        A dictionary with proxy headers, should not be used directly,
-        instead, see :class:`urllib3.connectionpool.ProxyManager`"
-    """
-
-    scheme = 'http'
-
-    def __init__(self, host, port=None, strict=False,
-                 timeout=Timeout.DEFAULT_TIMEOUT, maxsize=1, block=False,
-                 headers=None, _proxy=None, _proxy_headers=None):
-        ConnectionPool.__init__(self, host, port)
-        RequestMethods.__init__(self, headers)
-
-        self.strict = strict
-
-        # This is for backwards compatibility and can be removed once a timeout
-        # can only be set to a Timeout object
-        if not isinstance(timeout, Timeout):
-            timeout = Timeout.from_float(timeout)
-
-        self.timeout = timeout
-
-        self.pool = self.QueueCls(maxsize)
-        self.block = block
-
-        self.proxy = _proxy
-        self.proxy_headers = _proxy_headers or {}
-
-        # Fill the queue up so that doing get() on it will block properly
-        for _ in xrange(maxsize):
-            self.pool.put(None)
-
-        # These are mostly for testing and debugging purposes.
-        self.num_connections = 0
-        self.num_requests = 0
-
-    def _new_conn(self):
-        """
-        Return a fresh :class:`httplib.HTTPConnection`.
-        """
-        self.num_connections += 1
-        log.info("Starting new HTTP connection (%d): %s" %
-                 (self.num_connections, self.host))
-        extra_params = {}
-        if not six.PY3:  # Python 2
-            extra_params['strict'] = self.strict
-
-        return HTTPConnection(host=self.host, port=self.port,
-                              timeout=self.timeout.connect_timeout,
-                              **extra_params)
-
-
-    def _get_conn(self, timeout=None):
-        """
-        Get a connection. Will return a pooled connection if one is available.
-
-        If no connections are available and :prop:`.block` is ``False``, then a
-        fresh connection is returned.
-
-        :param timeout:
-            Seconds to wait before giving up and raising
-            :class:`urllib3.exceptions.EmptyPoolError` if the pool is empty and
-            :prop:`.block` is ``True``.
-        """
-        conn = None
-        try:
-            conn = self.pool.get(block=self.block, timeout=timeout)
-
-        except AttributeError: # self.pool is None
-            raise ClosedPoolError(self, "Pool is closed.")
-
-        except Empty:
-            if self.block:
-                raise EmptyPoolError(self,
-                                     "Pool reached maximum size and no more "
-                                     "connections are allowed.")
-            pass  # Oh well, we'll create a new connection then
-
-        # If this is a persistent connection, check if it got disconnected
-        if conn and is_connection_dropped(conn):
-            log.info("Resetting dropped connection: %s" % self.host)
-            conn.close()
-
-        return conn or self._new_conn()
-
-    def _put_conn(self, conn):
-        """
-        Put a connection back into the pool.
-
-        :param conn:
-            Connection object for the current host and port as returned by
-            :meth:`._new_conn` or :meth:`._get_conn`.
-
-        If the pool is already full, the connection is closed and discarded
-        because we exceeded maxsize. If connections are discarded frequently,
-        then maxsize should be increased.
-
-        If the pool is closed, then the connection will be closed and discarded.
-        """
-        try:
-            self.pool.put(conn, block=False)
-            return # Everything is dandy, done.
-        except AttributeError:
-            # self.pool is None.
-            pass
-        except Full:
-            # This should never happen if self.block == True
-            log.warning("HttpConnectionPool is full, discarding connection: %s"
-                        % self.host)
-
-        # Connection never got put back into the pool, close it.
-        if conn:
-            conn.close()
-
-    def _get_timeout(self, timeout):
-        """ Helper that always returns a :class:`urllib3.util.Timeout` """
-        if timeout is _Default:
-            return self.timeout.clone()
-
-        if isinstance(timeout, Timeout):
-            return timeout.clone()
-        else:
-            # User passed us an int/float. This is for backwards compatibility,
-            # can be removed later
-            return Timeout.from_float(timeout)
-
-    def _make_request(self, conn, method, url, timeout=_Default,
-                      **httplib_request_kw):
-        """
-        Perform a request on a given httplib connection object taken from our
-        pool.
-
-        :param conn:
-            a connection from one of our connection pools
-
-        :param timeout:
-            Socket timeout in seconds for the request. This can be a
-            float or integer, which will set the same timeout value for
-            the socket connect and the socket read, or an instance of
-            :class:`urllib3.util.Timeout`, which gives you more fine-grained
-            control over your timeouts.
-        """
-        self.num_requests += 1
-
-        timeout_obj = self._get_timeout(timeout)
-
-        try:
-            timeout_obj.start_connect()
-            conn.timeout = timeout_obj.connect_timeout
-            # conn.request() calls httplib.*.request, not the method in
-            # request.py. It also calls makefile (recv) on the socket
-            conn.request(method, url, **httplib_request_kw)
-        except SocketTimeout:
-            raise ConnectTimeoutError(
-                self, "Connection to %s timed out. (connect timeout=%s)" %
-                (self.host, timeout_obj.connect_timeout))
-
-        # Reset the timeout for the recv() on the socket
-        read_timeout = timeout_obj.read_timeout
-        log.debug("Setting read timeout to %s" % read_timeout)
-        # App Engine doesn't have a sock attr
-        if hasattr(conn, 'sock') and \
-            read_timeout is not None and \
-            read_timeout is not Timeout.DEFAULT_TIMEOUT:
-            # In Python 3 socket.py will catch EAGAIN and return None when you
-            # try and read into the file pointer created by http.client, which
-            # instead raises a BadStatusLine exception. Instead of catching
-            # the exception and assuming all BadStatusLine exceptions are read
-            # timeouts, check for a zero timeout before making the request.
-            if read_timeout == 0:
-                raise ReadTimeoutError(
-                    self, url,
-                    "Read timed out. (read timeout=%s)" % read_timeout)
-            conn.sock.settimeout(read_timeout)
-
-        # Receive the response from the server
-        try:
-            try: # Python 2.7+, use buffering of HTTP responses
-                httplib_response = conn.getresponse(buffering=True)
-            except TypeError: # Python 2.6 and older
-                httplib_response = conn.getresponse()
-        except SocketTimeout:
-            raise ReadTimeoutError(
-                self, url, "Read timed out. (read timeout=%s)" % read_timeout)
-
-        except SocketError as e: # Platform-specific: Python 2
-            # See the above comment about EAGAIN in Python 3. In Python 2 we
-            # have to specifically catch it and throw the timeout error
-            if e.errno in _blocking_errnos:
-                raise ReadTimeoutError(
-                    self, url,
-                    "Read timed out. (read timeout=%s)" % read_timeout)
-            raise
-
-
-        # AppEngine doesn't have a version attr.
-        http_version = getattr(conn, '_http_vsn_str', 'HTTP/?')
-        log.debug("\"%s %s %s\" %s %s" % (method, url, http_version,
-                                          httplib_response.status,
-                                          httplib_response.length))
-        return httplib_response
-
-    def close(self):
-        """
-        Close all pooled connections and disable the pool.
-        """
-        # Disable access to the pool
-        old_pool, self.pool = self.pool, None
-
-        try:
-            while True:
-                conn = old_pool.get(block=False)
-                if conn:
-                    conn.close()
-
-        except Empty:
-            pass # Done.
-
-    def is_same_host(self, url):
-        """
-        Check if the given ``url`` is a member of the same host as this
-        connection pool.
-        """
-        if url.startswith('/'):
-            return True
-
-        # TODO: Add optional support for socket.gethostbyname checking.
-        scheme, host, port = get_host(url)
-
-        if self.port and not port:
-            # Use explicit default port for comparison when none is given.
-            port = port_by_scheme.get(scheme)
-
-        return (scheme, host, port) == (self.scheme, self.host, self.port)
-
-    def urlopen(self, method, url, body=None, headers=None, retries=3,
-                redirect=True, assert_same_host=True, timeout=_Default,
-                pool_timeout=None, release_conn=None, **response_kw):
-        """
-        Get a connection from the pool and perform an HTTP request. This is the
-        lowest level call for making a request, so you'll need to specify all
-        the raw details.
-
-        .. note::
-
-           More commonly, it's appropriate to use a convenience method provided
-           by :class:`.RequestMethods`, such as :meth:`request`.
-
-        .. note::
-
-           `release_conn` will only behave as expected if
-           `preload_content=False` because we want to make
-           `preload_content=False` the default behaviour someday soon without
-           breaking backwards compatibility.
-
-        :param method:
-            HTTP request method (such as GET, POST, PUT, etc.)
-
-        :param body:
-            Data to send in the request body (useful for creating
-            POST requests, see HTTPConnectionPool.post_url for
-            more convenience).
-
-        :param headers:
-            Dictionary of custom headers to send, such as User-Agent,
-            If-None-Match, etc. If None, pool headers are used. If provided,
-            these headers completely replace any pool-specific headers.
-
-        :param retries:
-            Number of retries to allow before raising a MaxRetryError exception.
-
-        :param redirect:
-            If True, automatically handle redirects (status codes 301, 302,
-            303, 307, 308). Each redirect counts as a retry.
-
-        :param assert_same_host:
-            If ``True``, will make sure that the host of the pool requests is
-            consistent else will raise HostChangedError. When False, you can
-            use the pool on an HTTP proxy and request foreign hosts.
-
-        :param timeout:
-            If specified, overrides the default timeout for this one
-            request. It may be a float (in seconds) or an instance of
-            :class:`urllib3.util.Timeout`.
-
-        :param pool_timeout:
-            If set and the pool is set to block=True, then this method will
-            block for ``pool_timeout`` seconds and raise EmptyPoolError if no
-            connection is available within the time period.
-
-        :param release_conn:
-            If False, then the urlopen call will not release the connection
-            back into the pool once a response is received (but will release if
-            you read the entire contents of the response such as when
-            `preload_content=True`). This is useful if you're not preloading
-            the response's content immediately. You will need to call
-            ``r.release_conn()`` on the response ``r`` to return the connection
-            back into the pool. If None, it takes the value of
-            ``response_kw.get('preload_content', True)``.
-
-        :param \**response_kw:
-            Additional parameters are passed to
-            :meth:`urllib3.response.HTTPResponse.from_httplib`
-        """
-        if headers is None:
-            headers = self.headers
-
-        if retries < 0:
-            raise MaxRetryError(self, url)
-
-        if release_conn is None:
-            release_conn = response_kw.get('preload_content', True)
-
-        # Check host
-        if assert_same_host and not self.is_same_host(url):
-            raise HostChangedError(self, url, retries - 1)
-
-        conn = None
-
-        try:
-            # Request a connection from the queue
-            conn = self._get_conn(timeout=pool_timeout)
-
-            # Make the request on the httplib connection object
-            httplib_response = self._make_request(conn, method, url,
-                                                  timeout=timeout,
-                                                  body=body, headers=headers)
-
-            # If we're going to release the connection in ``finally:``, then
-            # the request doesn't need to know about the connection. Otherwise
-            # it will also try to release it and we'll have a double-release
-            # mess.
-            response_conn = not release_conn and conn
-
-            # Import httplib's response into our own wrapper object
-            response = HTTPResponse.from_httplib(httplib_response,
-                                                 pool=self,
-                                                 connection=response_conn,
-                                                 **response_kw)
-
-            # else:
-            #     The connection will be put back into the pool when
-            #     ``response.release_conn()`` is called (implicitly by
-            #     ``response.read()``)
-
-        except Empty:
-            # Timed out by queue
-            raise ReadTimeoutError(
-                self, url, "Read timed out, no pool connections are available.")
-
-        except SocketTimeout:
-            # Timed out by socket
-            raise ReadTimeoutError(self, url, "Read timed out.")
-
-        except BaseSSLError as e:
-            # SSL certificate error
-            if 'timed out' in str(e) or \
-               'did not complete (read)' in str(e): # Platform-specific: Python 2.6
-                raise ReadTimeoutError(self, url, "Read timed out.")
-            raise SSLError(e)
-
-        except CertificateError as e:
-            # Name mismatch
-            raise SSLError(e)
-
-        except (HTTPException, SocketError) as e:
-            if isinstance(e, SocketError) and self.proxy is not None:
-                raise ProxyError('Cannot connect to proxy. '
-                                 'Socket error: %s.' % e)
-
-            # Connection broken, discard. It will be replaced next _get_conn().
-            conn = None
-            # This is necessary so we can access e below
-            err = e
-
-            if retries == 0:
-                raise MaxRetryError(self, url, e)
-
-        finally:
-            if release_conn:
-                # Put the connection back to be reused. If the connection is
-                # expired then it will be None, which will get replaced with a
-                # fresh connection during _get_conn.
-                self._put_conn(conn)
-
-        if not conn:
-            # Try again
-            log.warn("Retrying (%d attempts remain) after connection "
-                     "broken by '%r': %s" % (retries, err, url))
-            return self.urlopen(method, url, body, headers, retries - 1,
-                                redirect, assert_same_host,
-                                timeout=timeout, pool_timeout=pool_timeout,
-                                release_conn=release_conn, **response_kw)
-
-        # Handle redirect?
-        redirect_location = redirect and response.get_redirect_location()
-        if redirect_location:
-            if response.status == 303:
-                method = 'GET'
-            log.info("Redirecting %s -> %s" % (url, redirect_location))
-            return self.urlopen(method, redirect_location, body, headers,
-                                retries - 1, redirect, assert_same_host,
-                                timeout=timeout, pool_timeout=pool_timeout,
-                                release_conn=release_conn, **response_kw)
-
-        return response
-
-
-class HTTPSConnectionPool(HTTPConnectionPool):
-    """
-    Same as :class:`.HTTPConnectionPool`, but HTTPS.
-
-    When Python is compiled with the :mod:`ssl` module, then
-    :class:`.VerifiedHTTPSConnection` is used, which *can* verify certificates,
-    instead of :class:`httplib.HTTPSConnection`.
-
-    :class:`.VerifiedHTTPSConnection` uses one of ``assert_fingerprint``,
-    ``assert_hostname`` and ``host`` in this order to verify connections.
-    If ``assert_hostname`` is False, no verification is done.
-
-    The ``key_file``, ``cert_file``, ``cert_reqs``, ``ca_certs`` and
-    ``ssl_version`` are only used if :mod:`ssl` is available and are fed into
-    :meth:`urllib3.util.ssl_wrap_socket` to upgrade the connection socket
-    into an SSL socket.
-    """
-
-    scheme = 'https'
-
-    def __init__(self, host, port=None,
-                 strict=False, timeout=None, maxsize=1,
-                 block=False, headers=None,
-                 _proxy=None, _proxy_headers=None,
-                 key_file=None, cert_file=None, cert_reqs=None,
-                 ca_certs=None, ssl_version=None,
-                 assert_hostname=None, assert_fingerprint=None):
-
-        HTTPConnectionPool.__init__(self, host, port, strict, timeout, maxsize,
-                                    block, headers, _proxy, _proxy_headers)
-        self.key_file = key_file
-        self.cert_file = cert_file
-        self.cert_reqs = cert_reqs
-        self.ca_certs = ca_certs
-        self.ssl_version = ssl_version
-        self.assert_hostname = assert_hostname
-        self.assert_fingerprint = assert_fingerprint
-
-    def _prepare_conn(self, connection):
-        """
-        Prepare the ``connection`` for :meth:`urllib3.util.ssl_wrap_socket`
-        and establish the tunnel if proxy is used.
-        """
-
-        if isinstance(connection, VerifiedHTTPSConnection):
-            connection.set_cert(key_file=self.key_file,
-                                cert_file=self.cert_file,
-                                cert_reqs=self.cert_reqs,
-                                ca_certs=self.ca_certs,
-                                assert_hostname=self.assert_hostname,
-                                assert_fingerprint=self.assert_fingerprint)
-            connection.ssl_version = self.ssl_version
-
-        if self.proxy is not None:
-            # Python 2.7+
-            try:
-                set_tunnel = connection.set_tunnel
-            except AttributeError:  # Platform-specific: Python 2.6
-                set_tunnel = connection._set_tunnel
-            set_tunnel(self.host, self.port, self.proxy_headers)
-            # Establish tunnel connection early, because otherwise httplib
-            # would improperly set Host: header to proxy's IP:port.
-            connection.connect()
-
-        return connection
-
-    def _new_conn(self):
-        """
-        Return a fresh :class:`httplib.HTTPSConnection`.
-        """
-        self.num_connections += 1
-        log.info("Starting new HTTPS connection (%d): %s"
-                 % (self.num_connections, self.host))
-
-        actual_host = self.host
-        actual_port = self.port
-        if self.proxy is not None:
-            actual_host = self.proxy.host
-            actual_port = self.proxy.port
-
-        if not ssl:  # Platform-specific: Python compiled without +ssl
-            if not HTTPSConnection or HTTPSConnection is object:
-                raise SSLError("Can't connect to HTTPS URL because the SSL "
-                               "module is not available.")
-            connection_class = HTTPSConnection
-        else:
-            connection_class = VerifiedHTTPSConnection
-
-        extra_params = {}
-        if not six.PY3:  # Python 2
-            extra_params['strict'] = self.strict
-        connection = connection_class(host=actual_host, port=actual_port,
-                                      timeout=self.timeout.connect_timeout,
-                                      **extra_params)
-
-        return self._prepare_conn(connection)
-
-
-def connection_from_url(url, **kw):
-    """
-    Given a url, return an :class:`.ConnectionPool` instance of its host.
-
-    This is a shortcut for not having to parse out the scheme, host, and port
-    of the url before creating an :class:`.ConnectionPool` instance.
-
-    :param url:
-        Absolute URL string that must include the scheme. Port is optional.
-
-    :param \**kw:
-        Passes additional parameters to the constructor of the appropriate
-        :class:`.ConnectionPool`. Useful for specifying things like
-        timeout, maxsize, headers, etc.
-
-    Example: ::
-
-        >>> conn = connection_from_url('http://google.com/')
-        >>> r = conn.request('GET', '/')
-    """
-    scheme, host, port = get_host(url)
-    if scheme == 'https':
-        return HTTPSConnectionPool(host, port=port, **kw)
-    else:
-        return HTTPConnectionPool(host, port=port, **kw)