--- a/env/lib/python3.7/site-packages/urllib3/util/connection.py	Thu May 14 16:47:39 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,138 +0,0 @@
-from __future__ import absolute_import
-import socket
-from .wait import NoWayToWaitForSocketError, wait_for_read
-from ..contrib import _appengine_environ
-
-
-def is_connection_dropped(conn):  # Platform-specific
-    """
-    Returns True if the connection is dropped and should be closed.
-
-    :param conn:
-        :class:`httplib.HTTPConnection` object.
-
-    Note: For platforms like AppEngine, this will always return ``False`` to
-    let the platform handle connection recycling transparently for us.
-    """
-    sock = getattr(conn, "sock", False)
-    if sock is False:  # Platform-specific: AppEngine
-        return False
-    if sock is None:  # Connection already closed (such as by httplib).
-        return True
-    try:
-        # Returns True if readable, which here means it's been dropped
-        return wait_for_read(sock, timeout=0.0)
-    except NoWayToWaitForSocketError:  # Platform-specific: AppEngine
-        return False
-
-
-# This function is copied from socket.py in the Python 2.7 standard
-# library test suite. Added to its signature is only `socket_options`.
-# One additional modification is that we avoid binding to IPv6 servers
-# discovered in DNS if the system doesn't have IPv6 functionality.
-def create_connection(
-    address,
-    timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
-    source_address=None,
-    socket_options=None,
-):
-    """Connect to *address* and return the socket object.
-
-    Convenience function.  Connect to *address* (a 2-tuple ``(host,
-    port)``) and return the socket object.  Passing the optional
-    *timeout* parameter will set the timeout on the socket instance
-    before attempting to connect.  If no *timeout* is supplied, the
-    global default timeout setting returned by :func:`getdefaulttimeout`
-    is used.  If *source_address* is set it must be a tuple of (host, port)
-    for the socket to bind as a source address before making the connection.
-    An host of '' or port 0 tells the OS to use the default.
-    """
-
-    host, port = address
-    if host.startswith("["):
-        host = host.strip("[]")
-    err = None
-
-    # Using the value from allowed_gai_family() in the context of getaddrinfo lets
-    # us select whether to work with IPv4 DNS records, IPv6 records, or both.
-    # The original create_connection function always returns all records.
-    family = allowed_gai_family()
-
-    for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
-        af, socktype, proto, canonname, sa = res
-        sock = None
-        try:
-            sock = socket.socket(af, socktype, proto)
-
-            # If provided, set socket level options before connecting.
-            _set_socket_options(sock, socket_options)
-
-            if timeout is not socket._GLOBAL_DEFAULT_TIMEOUT:
-                sock.settimeout(timeout)
-            if source_address:
-                sock.bind(source_address)
-            sock.connect(sa)
-            return sock
-
-        except socket.error as e:
-            err = e
-            if sock is not None:
-                sock.close()
-                sock = None
-
-    if err is not None:
-        raise err
-
-    raise socket.error("getaddrinfo returns an empty list")
-
-
-def _set_socket_options(sock, options):
-    if options is None:
-        return
-
-    for opt in options:
-        sock.setsockopt(*opt)
-
-
-def allowed_gai_family():
-    """This function is designed to work in the context of
-    getaddrinfo, where family=socket.AF_UNSPEC is the default and
-    will perform a DNS search for both IPv6 and IPv4 records."""
-
-    family = socket.AF_INET
-    if HAS_IPV6:
-        family = socket.AF_UNSPEC
-    return family
-
-
-def _has_ipv6(host):
-    """ Returns True if the system can bind an IPv6 address. """
-    sock = None
-    has_ipv6 = False
-
-    # App Engine doesn't support IPV6 sockets and actually has a quota on the
-    # number of sockets that can be used, so just early out here instead of
-    # creating a socket needlessly.
-    # See https://github.com/urllib3/urllib3/issues/1446
-    if _appengine_environ.is_appengine_sandbox():
-        return False
-
-    if socket.has_ipv6:
-        # has_ipv6 returns true if cPython was compiled with IPv6 support.
-        # It does not tell us if the system has IPv6 support enabled. To
-        # determine that we must bind to an IPv6 address.
-        # https://github.com/urllib3/urllib3/pull/611
-        # https://bugs.python.org/issue658327
-        try:
-            sock = socket.socket(socket.AF_INET6)
-            sock.bind((host, 0))
-            has_ipv6 = True
-        except Exception:
-            pass
-
-    if sock:
-        sock.close()
-    return has_ipv6
-
-
-HAS_IPV6 = _has_ipv6("::1")