Upgraded requests to git-master and forced urllib3 to git-master. Fixes strange errors with pyOpenSSL. See https://github.com/shazow/urllib3/issues/556.

lib/requests/packages/README.rst

@@ -0,0 +1,8 @@
+If you are planning to submit a pull request to requests with any changes in 
+this library do not go any further. These are independent libraries which we 
+vendor into requests. Any changes necessary to these libraries must be made in 
+them and submitted as separate pull requests to those libraries.
+
+urllib3 pull requests go here: https://github.com/shazow/urllib3
+
+chardet pull requests go here: https://github.com/chardet/chardet

lib/requests/packages/urllib3/__init__.py

@@ -55,9 +55,14 @@ def add_stderr_logger(level=logging.DEBUG):
 del NullHandler
 
 
-# Set security warning to only go off once by default.
 import warnings
-warnings.simplefilter('always', exceptions.SecurityWarning)
+# SecurityWarning's always go off by default.
+warnings.simplefilter('always', exceptions.SecurityWarning, append=True)
+# SubjectAltNameWarning's should go off once per host
+warnings.simplefilter('default', exceptions.SubjectAltNameWarning)
+# InsecurePlatformWarning's don't vary between requests, so we keep it default.
+warnings.simplefilter('default', exceptions.InsecurePlatformWarning,
+                      append=True)
 
 def disable_warnings(category=exceptions.HTTPWarning):
     """

lib/requests/packages/urllib3/_collections.py

@@ -1,7 +1,7 @@
 from collections import Mapping, MutableMapping
 try:
     from threading import RLock
-except ImportError: # Platform-specific: No threads available
+except ImportError:  # Platform-specific: No threads available
     class RLock:
         def __enter__(self):
             pass
@@ -10,11 +10,11 @@ except ImportError: # Platform-specific: No threads available
             pass
 
 
-try: # Python 2.7+
+try:  # Python 2.7+
     from collections import OrderedDict
 except ImportError:
     from .packages.ordered_dict import OrderedDict
-from .packages.six import iterkeys, itervalues
+from .packages.six import iterkeys, itervalues, PY3
 
 
 __all__ = ['RecentlyUsedContainer', 'HTTPHeaderDict']
@@ -129,25 +129,82 @@ class HTTPHeaderDict(MutableMapping):
     'foo=bar, baz=quxx'
     >>> headers['Content-Length']
     '7'
-
-    If you want to access the raw headers with their original casing
-    for debugging purposes you can access the private ``._data`` attribute
-    which is a normal python ``dict`` that maps the case-insensitive key to a
-    list of tuples stored as (case-sensitive-original-name, value). Using the
-    structure from above as our example:
-
-    >>> headers._data
-    {'set-cookie': [('Set-Cookie', 'foo=bar'), ('set-cookie', 'baz=quxx')],
-    'content-length': [('content-length', '7')]}
     """
 
     def __init__(self, headers=None, **kwargs):
-        self._data = {}
-        if headers is None:
-            headers = {}
-        self.update(headers, **kwargs)
+        super(HTTPHeaderDict, self).__init__()
+        self._container = {}
+        if headers is not None:
+            if isinstance(headers, HTTPHeaderDict):
+                self._copy_from(headers)
+            else:
+                self.extend(headers)
+        if kwargs:
+            self.extend(kwargs)
 
-    def add(self, key, value):
+    def __setitem__(self, key, val):
+        self._container[key.lower()] = (key, val)
+        return self._container[key.lower()]
+
+    def __getitem__(self, key):
+        val = self._container[key.lower()]
+        return ', '.join(val[1:])
+
+    def __delitem__(self, key):
+        del self._container[key.lower()]
+
+    def __contains__(self, key):
+        return key.lower() in self._container
+
+    def __eq__(self, other):
+        if not isinstance(other, Mapping) and not hasattr(other, 'keys'):
+            return False
+        if not isinstance(other, type(self)):
+            other = type(self)(other)
+        return (dict((k.lower(), v) for k, v in self.itermerged()) ==
+                dict((k.lower(), v) for k, v in other.itermerged()))
+
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
+    if not PY3: # Python 2
+        iterkeys = MutableMapping.iterkeys
+        itervalues = MutableMapping.itervalues
+
+    __marker = object()
+
+    def __len__(self):
+        return len(self._container)
+
+    def __iter__(self):
+        # Only provide the originally cased names
+        for vals in self._container.values():
+            yield vals[0]
+
+    def pop(self, key, default=__marker):
+        '''D.pop(k[,d]) -> v, remove specified key and return the corresponding value.
+          If key is not found, d is returned if given, otherwise KeyError is raised.
+        '''
+        # Using the MutableMapping function directly fails due to the private marker.
+        # Using ordinary dict.pop would expose the internal structures.
+        # So let's reinvent the wheel.
+        try:
+            value = self[key]
+        except KeyError:
+            if default is self.__marker:
+                raise
+            return default
+        else:
+            del self[key]
+            return value
+
+    def discard(self, key):
+        try:
+            del self[key]
+        except KeyError:
+            pass
+
+    def add(self, key, val):
         """Adds a (name, value) pair, doesn't overwrite the value if it already
         exists.
 
@@ -156,43 +213,111 @@ class HTTPHeaderDict(MutableMapping):
         >>> headers['foo']
         'bar, baz'
         """
-        self._data.setdefault(key.lower(), []).append((key, value))
+        key_lower = key.lower()
+        new_vals = key, val
+        # Keep the common case aka no item present as fast as possible
+        vals = self._container.setdefault(key_lower, new_vals)
+        if new_vals is not vals:
+            # new_vals was not inserted, as there was a previous one
+            if isinstance(vals, list):
+                # If already several items got inserted, we have a list
+                vals.append(val)
+            else:
+                # vals should be a tuple then, i.e. only one item so far
+                # Need to convert the tuple to list for further extension
+                self._container[key_lower] = [vals[0], vals[1], val]
+
+    def extend(self, *args, **kwargs):
+        """Generic import function for any type of header-like object.
+        Adapted version of MutableMapping.update in order to insert items
+        with self.add instead of self.__setitem__
+        """
+        if len(args) > 1:
+            raise TypeError("extend() takes at most 1 positional "
+                            "arguments ({} given)".format(len(args)))
+        other = args[0] if len(args) >= 1 else ()
+
+        if isinstance(other, HTTPHeaderDict):
+            for key, val in other.iteritems():
+                self.add(key, val)
+        elif isinstance(other, Mapping):
+            for key in other:
+                self.add(key, other[key])
+        elif hasattr(other, "keys"):
+            for key in other.keys():
+                self.add(key, other[key])
+        else:
+            for key, value in other:
+                self.add(key, value)
+
+        for key, value in kwargs.items():
+            self.add(key, value)
 
     def getlist(self, key):
         """Returns a list of all the values for the named field. Returns an
         empty list if the key doesn't exist."""
-        return self[key].split(', ') if key in self else []
+        try:
+            vals = self._container[key.lower()]
+        except KeyError:
+            return []
+        else:
+            if isinstance(vals, tuple):
+                return [vals[1]]
+            else:
+                return vals[1:]
 
-    def copy(self):
-        h = HTTPHeaderDict()
-        for key in self._data:
-            for rawkey, value in self._data[key]:
-                h.add(rawkey, value)
-        return h
-
-    def __eq__(self, other):
-        if not isinstance(other, Mapping):
-            return False
-        other = HTTPHeaderDict(other)
-        return dict((k1, self[k1]) for k1 in self._data) == \
-                dict((k2, other[k2]) for k2 in other._data)
-
-    def __getitem__(self, key):
-        values = self._data[key.lower()]
-        return ', '.join(value[1] for value in values)
-
-    def __setitem__(self, key, value):
-        self._data[key.lower()] = [(key, value)]
-
-    def __delitem__(self, key):
-        del self._data[key.lower()]
-
-    def __len__(self):
-        return len(self._data)
-
-    def __iter__(self):
-        for headers in itervalues(self._data):
-            yield headers[0][0]
+    # Backwards compatibility for httplib
+    getheaders = getlist
+    getallmatchingheaders = getlist
+    iget = getlist
 
     def __repr__(self):
-        return '%s(%r)' % (self.__class__.__name__, dict(self.items()))
+        return "%s(%s)" % (type(self).__name__, dict(self.itermerged()))
+
+    def _copy_from(self, other):
+        for key in other:
+            val = other.getlist(key)
+            if isinstance(val, list):
+                # Don't need to convert tuples
+                val = list(val)
+            self._container[key.lower()] = [key] + val
+
+    def copy(self):
+        clone = type(self)()
+        clone._copy_from(self)
+        return clone
+
+    def iteritems(self):
+        """Iterate over all header lines, including duplicate ones."""
+        for key in self:
+            vals = self._container[key.lower()]
+            for val in vals[1:]:
+                yield vals[0], val
+
+    def itermerged(self):
+        """Iterate over all headers, merging duplicate ones together."""
+        for key in self:
+            val = self._container[key.lower()]
+            yield val[0], ', '.join(val[1:])
+
+    def items(self):
+        return list(self.iteritems())
+
+    @classmethod
+    def from_httplib(cls, message): # Python 2
+        """Read headers from a Python 2 httplib message object."""
+        # python2.7 does not expose a proper API for exporting multiheaders
+        # efficiently. This function re-reads raw lines from the message
+        # object and extracts the multiheaders properly.
+        headers = []
+
+        for line in message.headers:
+            if line.startswith((' ', '\t')):
+                key, value = headers[-1]
+                headers[-1] = (key, value + '\r\n' + line.rstrip())
+                continue
+
+            key, value = line.split(':', 1)
+            headers.append((key, value.strip()))
+
+        return cls(headers)

lib/requests/packages/urllib3/connection.py

@@ -1,7 +1,7 @@
 import datetime
 import sys
 import socket
-from socket import timeout as SocketTimeout
+from socket import error as SocketError, timeout as SocketTimeout
 import warnings
 from .packages import six
 
@@ -36,9 +36,10 @@ except NameError:  # Python 2:
 
 
 from .exceptions import (
+    NewConnectionError,
     ConnectTimeoutError,
+    SubjectAltNameWarning,
     SystemTimeWarning,
-    SecurityWarning,
 )
 from .packages.ssl_match_hostname import match_hostname
 
@@ -133,11 +134,15 @@ class HTTPConnection(_HTTPConnection, object):
             conn = connection.create_connection(
                 (self.host, self.port), self.timeout, **extra_kw)
 
-        except SocketTimeout:
+        except SocketTimeout as e:
             raise ConnectTimeoutError(
                 self, "Connection to %s timed out. (connect timeout=%s)" %
                 (self.host, self.timeout))
 
+        except SocketError as e:
+            raise NewConnectionError(
+                self, "Failed to establish a new connection: %s" % e)
+
         return conn
 
     def _prepare_conn(self, conn):
@@ -185,17 +190,23 @@ class VerifiedHTTPSConnection(HTTPSConnection):
     """
     cert_reqs = None
     ca_certs = None
+    ca_cert_dir = None
     ssl_version = None
     assert_fingerprint = None
 
     def set_cert(self, key_file=None, cert_file=None,
                  cert_reqs=None, ca_certs=None,
-                 assert_hostname=None, assert_fingerprint=None):
+                 assert_hostname=None, assert_fingerprint=None,
+                 ca_cert_dir=None):
+
+        if (ca_certs or ca_cert_dir) and cert_reqs is None:
+            cert_reqs = 'CERT_REQUIRED'
 
         self.key_file = key_file
         self.cert_file = cert_file
         self.cert_reqs = cert_reqs
         self.ca_certs = ca_certs
+        self.ca_cert_dir = ca_cert_dir
         self.assert_hostname = assert_hostname
         self.assert_fingerprint = assert_fingerprint
 
@@ -234,6 +245,7 @@ class VerifiedHTTPSConnection(HTTPSConnection):
         self.sock = ssl_wrap_socket(conn, self.key_file, self.cert_file,
                                     cert_reqs=resolved_cert_reqs,
                                     ca_certs=self.ca_certs,
+                                    ca_cert_dir=self.ca_cert_dir,
                                     server_hostname=hostname,
                                     ssl_version=resolved_ssl_version)
 
@@ -245,10 +257,11 @@ class VerifiedHTTPSConnection(HTTPSConnection):
             cert = self.sock.getpeercert()
             if not cert.get('subjectAltName', ()):
                 warnings.warn((
-                    'Certificate has no `subjectAltName`, falling back to check for a `commonName` for now. '
-                    'This feature is being removed by major browsers and deprecated by RFC 2818. '
-                    '(See https://github.com/shazow/urllib3/issues/497 for details.)'),
-                    SecurityWarning
+                    'Certificate for {0} has no `subjectAltName`, falling back to check for a '
+                    '`commonName` for now. This feature is being removed by major browsers and '
+                    'deprecated by RFC 2818. (See https://github.com/shazow/urllib3/issues/497 '
+                    'for details.)'.format(hostname)),
+                    SubjectAltNameWarning
                 )
             match_hostname(cert, self.assert_hostname or hostname)
 
@@ -260,3 +273,5 @@ if ssl:
     # Make a copy for testing.
     UnverifiedHTTPSConnection = HTTPSConnection
     HTTPSConnection = VerifiedHTTPSConnection
+else:
+    HTTPSConnection = DummyConnection

lib/requests/packages/urllib3/connectionpool.py

@@ -17,14 +17,17 @@ from .exceptions import (
     ClosedPoolError,
     ProtocolError,
     EmptyPoolError,
+    HeaderParsingError,
     HostChangedError,
     LocationValueError,
     MaxRetryError,
     ProxyError,
+    ConnectTimeoutError,
     ReadTimeoutError,
     SSLError,
     TimeoutError,
     InsecureRequestWarning,
+    NewConnectionError,
 )
 from .packages.ssl_match_hostname import CertificateError
 from .packages import six
@@ -38,9 +41,10 @@ from .request import RequestMethods
 from .response import HTTPResponse
 
 from .util.connection import is_connection_dropped
+from .util.response import assert_header_parsing
 from .util.retry import Retry
 from .util.timeout import Timeout
-from .util.url import get_host
+from .util.url import get_host, Url
 
 
 xrange = six.moves.xrange
@@ -72,6 +76,21 @@ class ConnectionPool(object):
         return '%s(host=%r, port=%r)' % (type(self).__name__,
                                          self.host, self.port)
 
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self.close()
+        # Return False to re-raise any potential exceptions
+        return False
+
+    def close():
+        """
+        Close all pooled connections and disable the pool.
+        """
+        pass
+
+
 # This is taken from http://hg.python.org/cpython/file/7aaba721ebc0/Lib/socket.py#l252
 _blocking_errnos = set([errno.EAGAIN, errno.EWOULDBLOCK])
 
@@ -105,7 +124,7 @@ class HTTPConnectionPool(ConnectionPool, RequestMethods):
 
     :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
+        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.
 
@@ -266,6 +285,10 @@ class HTTPConnectionPool(ConnectionPool, RequestMethods):
         """
         pass
 
+    def _prepare_proxy(self, conn):
+        # Nothing to do for HTTP connections.
+        pass
+
     def _get_timeout(self, timeout):
         """ Helper that always returns a :class:`urllib3.util.Timeout` """
         if timeout is _Default:
@@ -349,7 +372,7 @@ class HTTPConnectionPool(ConnectionPool, RequestMethods):
 
         # Receive the response from the server
         try:
-            try:  # Python 2.7+, use buffering of HTTP responses
+            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()
@@ -362,8 +385,19 @@ class HTTPConnectionPool(ConnectionPool, RequestMethods):
         log.debug("\"%s %s %s\" %s %s" % (method, url, http_version,
                                           httplib_response.status,
                                           httplib_response.length))
+
+        try:
+            assert_header_parsing(httplib_response.msg)
+        except HeaderParsingError as hpe:  # Platform-specific: Python 3
+            log.warning(
+                'Failed to parse headers (url=%s): %s',
+                self._absolute_url(url), hpe, exc_info=True)
+
         return httplib_response
 
+    def _absolute_url(self, path):
+        return Url(scheme=self.scheme, host=self.host, port=self.port, path=path).url
+
     def close(self):
         """
         Close all pooled connections and disable the pool.
@@ -510,11 +544,18 @@ class HTTPConnectionPool(ConnectionPool, RequestMethods):
 
         try:
             # Request a connection from the queue.
+            timeout_obj = self._get_timeout(timeout)
             conn = self._get_conn(timeout=pool_timeout)
 
+            conn.timeout = timeout_obj.connect_timeout
+
+            is_new_proxy_conn = self.proxy is not None and not getattr(conn, 'sock', None)
+            if is_new_proxy_conn:
+                self._prepare_proxy(conn)
+
             # Make the request on the httplib connection object.
             httplib_response = self._make_request(conn, method, url,
-                                                  timeout=timeout,
+                                                  timeout=timeout_obj,
                                                   body=body, headers=headers)
 
             # If we're going to release the connection in ``finally:``, then
@@ -542,26 +583,30 @@ class HTTPConnectionPool(ConnectionPool, RequestMethods):
             # Close the connection. If a connection is reused on which there
             # was a Certificate error, the next request will certainly raise
             # another Certificate error.
-            if conn:
-                conn.close()
-                conn = None
+            conn = conn and conn.close()
+            release_conn = True
             raise SSLError(e)
 
-        except (TimeoutError, HTTPException, SocketError, ConnectionError) as e:
-            if conn:
-                # Discard the connection for these exceptions. It will be
-                # be replaced during the next _get_conn() call.
-                conn.close()
-                conn = None
+        except SSLError:
+            # Treat SSLError separately from BaseSSLError to preserve
+            # traceback.
+            conn = conn and conn.close()
+            release_conn = True
+            raise
 
-            stacktrace = sys.exc_info()[2]
-            if isinstance(e, SocketError) and self.proxy:
+        except (TimeoutError, HTTPException, SocketError, ProtocolError) as e:
+            # Discard the connection for these exceptions. It will be
+            # be replaced during the next _get_conn() call.
+            conn = conn and conn.close()
+            release_conn = True
+
+            if isinstance(e, (SocketError, NewConnectionError)) and self.proxy:
                 e = ProxyError('Cannot connect to proxy.', e)
             elif isinstance(e, (SocketError, HTTPException)):
                 e = ProtocolError('Connection aborted.', e)
 
-            retries = retries.increment(method, url, error=e,
-                                        _pool=self, _stacktrace=stacktrace)
+            retries = retries.increment(method, url, error=e, _pool=self,
+                                        _stacktrace=sys.exc_info()[2])
             retries.sleep()
 
             # Keep track of the error for the retry warning.
@@ -593,6 +638,9 @@ class HTTPConnectionPool(ConnectionPool, RequestMethods):
                 retries = retries.increment(method, url, response=response, _pool=self)
             except MaxRetryError:
                 if retries.raise_on_redirect:
+                    # Release the connection for this response, since we're not
+                    # returning it to be released manually.
+                    response.release_conn()
                     raise
                 return response
 
@@ -629,10 +677,10 @@ class HTTPSConnectionPool(HTTPConnectionPool):
     ``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.
+    The ``key_file``, ``cert_file``, ``cert_reqs``, ``ca_certs``,
+    ``ca_cert_dir``, 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'
@@ -645,15 +693,20 @@ class HTTPSConnectionPool(HTTPConnectionPool):
                  key_file=None, cert_file=None, cert_reqs=None,
                  ca_certs=None, ssl_version=None,
                  assert_hostname=None, assert_fingerprint=None,
-                 **conn_kw):
+                 ca_cert_dir=None, **conn_kw):
 
         HTTPConnectionPool.__init__(self, host, port, strict, timeout, maxsize,
                                     block, headers, retries, _proxy, _proxy_headers,
                                     **conn_kw)
+
+        if ca_certs and cert_reqs is None:
+            cert_reqs = 'CERT_REQUIRED'
+
         self.key_file = key_file
         self.cert_file = cert_file
         self.cert_reqs = cert_reqs
         self.ca_certs = ca_certs
+        self.ca_cert_dir = ca_cert_dir
         self.ssl_version = ssl_version
         self.assert_hostname = assert_hostname
         self.assert_fingerprint = assert_fingerprint
@@ -669,28 +722,31 @@ class HTTPSConnectionPool(HTTPConnectionPool):
                           cert_file=self.cert_file,
                           cert_reqs=self.cert_reqs,
                           ca_certs=self.ca_certs,
+                          ca_cert_dir=self.ca_cert_dir,
                           assert_hostname=self.assert_hostname,
                           assert_fingerprint=self.assert_fingerprint)
             conn.ssl_version = self.ssl_version
 
-        if self.proxy is not None:
-            # Python 2.7+
-            try:
-                set_tunnel = conn.set_tunnel
-            except AttributeError:  # Platform-specific: Python 2.6
-                set_tunnel = conn._set_tunnel
-
-            if sys.version_info <= (2, 6, 4) and not self.proxy_headers:   # Python 2.6.4 and older
-                set_tunnel(self.host, self.port)
-            else:
-                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.
-            conn.connect()
-
         return conn
 
+    def _prepare_proxy(self, conn):
+        """
+        Establish tunnel connection early, because otherwise httplib
+        would improperly set Host: header to proxy's IP:port.
+        """
+        # Python 2.7+
+        try:
+            set_tunnel = conn.set_tunnel
+        except AttributeError:  # Platform-specific: Python 2.6
+            set_tunnel = conn._set_tunnel
+
+        if sys.version_info <= (2, 6, 4) and not self.proxy_headers:   # Python 2.6.4 and older
+            set_tunnel(self.host, self.port)
+        else:
+            set_tunnel(self.host, self.port, self.proxy_headers)
+
+        conn.connect()
+
     def _new_conn(self):
         """
         Return a fresh :class:`httplib.HTTPSConnection`.
@@ -700,7 +756,6 @@ class HTTPSConnectionPool(HTTPConnectionPool):
                  % (self.num_connections, self.host))
 
         if not self.ConnectionCls or self.ConnectionCls is DummyConnection:
-            # Platform-specific: Python without ssl
             raise SSLError("Can't connect to HTTPS URL because the SSL "
                            "module is not available.")
 

lib/requests/packages/urllib3/contrib/appengine.py

@@ -0,0 +1,222 @@
+import logging
+import os
+import warnings
+
+from ..exceptions import (
+    HTTPError,
+    HTTPWarning,
+    MaxRetryError,
+    ProtocolError,
+    TimeoutError,
+    SSLError
+)
+
+from ..packages.six import BytesIO
+from ..request import RequestMethods
+from ..response import HTTPResponse
+from ..util.timeout import Timeout
+from ..util.retry import Retry
+
+try:
+    from google.appengine.api import urlfetch
+except ImportError:
+    urlfetch = None
+
+
+log = logging.getLogger(__name__)
+
+
+class AppEnginePlatformWarning(HTTPWarning):
+    pass
+
+
+class AppEnginePlatformError(HTTPError):
+    pass
+
+
+class AppEngineManager(RequestMethods):
+    """
+    Connection manager for Google App Engine sandbox applications.
+
+    This manager uses the URLFetch service directly instead of using the
+    emulated httplib, and is subject to URLFetch limitations as described in
+    the App Engine documentation here:
+
+        https://cloud.google.com/appengine/docs/python/urlfetch
+
+    Notably it will raise an AppEnginePlatformError if:
+        * URLFetch is not available.
+        * If you attempt to use this on GAEv2 (Managed VMs), as full socket
+          support is available.
+        * If a request size is more than 10 megabytes.
+        * If a response size is more than 32 megabtyes.
+        * If you use an unsupported request method such as OPTIONS.
+
+    Beyond those cases, it will raise normal urllib3 errors.
+    """
+
+    def __init__(self, headers=None, retries=None, validate_certificate=True):
+        if not urlfetch:
+            raise AppEnginePlatformError(
+                "URLFetch is not available in this environment.")
+
+        if is_prod_appengine_v2():
+            raise AppEnginePlatformError(
+                "Use normal urllib3.PoolManager instead of AppEngineManager"
+                "on Managed VMs, as using URLFetch is not necessary in "
+                "this environment.")
+
+        warnings.warn(
+            "urllib3 is using URLFetch on Google App Engine sandbox instead "
+            "of sockets. To use sockets directly instead of URLFetch see "
+            "https://urllib3.readthedocs.org/en/latest/contrib.html.",
+            AppEnginePlatformWarning)
+
+        RequestMethods.__init__(self, headers)
+        self.validate_certificate = validate_certificate
+
+        self.retries = retries or Retry.DEFAULT
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        # Return False to re-raise any potential exceptions
+        return False
+
+    def urlopen(self, method, url, body=None, headers=None,
+                retries=None, redirect=True, timeout=Timeout.DEFAULT_TIMEOUT,
+                **response_kw):
+
+        retries = self._get_retries(retries, redirect)
+
+        try:
+            response = urlfetch.fetch(
+                url,
+                payload=body,
+                method=method,
+                headers=headers or {},
+                allow_truncated=False,
+                follow_redirects=(
+                    redirect and
+                    retries.redirect != 0 and
+                    retries.total),
+                deadline=self._get_absolute_timeout(timeout),
+                validate_certificate=self.validate_certificate,
+            )
+        except urlfetch.DeadlineExceededError as e:
+            raise TimeoutError(self, e)
+
+        except urlfetch.InvalidURLError as e:
+            if 'too large' in e.message:
+                raise AppEnginePlatformError(
+                    "URLFetch request too large, URLFetch only "
+                    "supports requests up to 10mb in size.", e)
+            raise ProtocolError(e)
+
+        except urlfetch.DownloadError as e:
+            if 'Too many redirects' in e.message:
+                raise MaxRetryError(self, url, reason=e)
+            raise ProtocolError(e)
+
+        except urlfetch.ResponseTooLargeError as e:
+            raise AppEnginePlatformError(
+                "URLFetch response too large, URLFetch only supports"
+                "responses up to 32mb in size.", e)
+
+        except urlfetch.SSLCertificateError as e:
+            raise SSLError(e)
+
+        except urlfetch.InvalidMethodError as e:
+            raise AppEnginePlatformError(
+                "URLFetch does not support method: %s" % method, e)
+
+        http_response = self._urlfetch_response_to_http_response(
+            response, **response_kw)
+
+        # Check for redirect response
+        if (http_response.get_redirect_location() and
+                retries.raise_on_redirect and redirect):
+            raise MaxRetryError(self, url, "too many redirects")
+
+        # Check if we should retry the HTTP response.
+        if retries.is_forced_retry(method, status_code=http_response.status):
+            retries = retries.increment(
+                method, url, response=http_response, _pool=self)
+            log.info("Forced retry: %s" % url)
+            retries.sleep()
+            return self.urlopen(
+                method, url,
+                body=body, headers=headers,
+                retries=retries, redirect=redirect,
+                timeout=timeout, **response_kw)
+
+        return http_response
+
+    def _urlfetch_response_to_http_response(self, urlfetch_resp, **response_kw):
+
+        if is_prod_appengine_v1():
+            # Production GAE handles deflate encoding automatically, but does
+            # not remove the encoding header.
+            content_encoding = urlfetch_resp.headers.get('content-encoding')
+
+            if content_encoding == 'deflate':
+                del urlfetch_resp.headers['content-encoding']
+
+        return HTTPResponse(
+            # In order for decoding to work, we must present the content as
+            # a file-like object.
+            body=BytesIO(urlfetch_resp.content),
+            headers=urlfetch_resp.headers,
+            status=urlfetch_resp.status_code,
+            **response_kw
+        )
+
+    def _get_absolute_timeout(self, timeout):
+        if timeout is Timeout.DEFAULT_TIMEOUT:
+            return 5  # 5s is the default timeout for URLFetch.
+        if isinstance(timeout, Timeout):
+            if not timeout.read is timeout.connect:
+                warnings.warn(
+                    "URLFetch does not support granular timeout settings, "
+                    "reverting to total timeout.", AppEnginePlatformWarning)
+            return timeout.total
+        return timeout
+
+    def _get_retries(self, retries, redirect):
+        if not isinstance(retries, Retry):
+            retries = Retry.from_int(
+                retries, redirect=redirect, default=self.retries)
+
+        if retries.connect or retries.read or retries.redirect:
+            warnings.warn(
+                "URLFetch only supports total retries and does not "
+                "recognize connect, read, or redirect retry parameters.",
+                AppEnginePlatformWarning)
+
+        return retries
+
+
+def is_appengine():
+    return (is_local_appengine() or
+            is_prod_appengine_v1() or
+            is_prod_appengine_v2())
+
+
+def is_appengine_sandbox():
+    return is_appengine() and not is_prod_appengine_v2()
+
+
+def is_local_appengine():
+    return ('APPENGINE_RUNTIME' in os.environ and
+            'Development/' in os.environ['SERVER_SOFTWARE'])
+
+
+def is_prod_appengine_v1():
+    return ('APPENGINE_RUNTIME' in os.environ and
+            'Google App Engine/' in os.environ['SERVER_SOFTWARE'] and
+            not is_prod_appengine_v2())
+
+
+def is_prod_appengine_v2():
+    return os.environ.get('GAE_VM', False) == 'true'

lib/requests/packages/urllib3/contrib/pyopenssl.py

@@ -38,8 +38,6 @@ Module Variables
 ----------------
 
 :var DEFAULT_SSL_CIPHER_LIST: The list of supported SSL/TLS cipher suites.
-    Default: ``ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:
-    ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS``
 
 .. _sni: https://en.wikipedia.org/wiki/Server_Name_Indication
 .. _crime attack: https://en.wikipedia.org/wiki/CRIME_(security_exploit)
@@ -85,23 +83,16 @@ _openssl_verify = {
                        + OpenSSL.SSL.VERIFY_FAIL_IF_NO_PEER_CERT,
 }
 
-# A secure default.
-# Sources for more information on TLS ciphers:
-#
-# - https://wiki.mozilla.org/Security/Server_Side_TLS
-# - https://www.ssllabs.com/projects/best-practices/index.html
-# - https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
-#
-# The general intent is:
-# - Prefer cipher suites that offer perfect forward secrecy (DHE/ECDHE),
-# - prefer ECDHE over DHE for better performance,
-# - prefer any AES-GCM over any AES-CBC for better performance and security,
-# - use 3DES as fallback which is secure but slow,
-# - disable NULL authentication, MD5 MACs and DSS for security reasons.
-DEFAULT_SSL_CIPHER_LIST = "ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:" + \
-    "ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:" + \
-    "!aNULL:!MD5:!DSS"
+DEFAULT_SSL_CIPHER_LIST = util.ssl_.DEFAULT_CIPHERS
 
+# OpenSSL will only write 16K at a time
+SSL_WRITE_BLOCKSIZE = 16384
+
+try:
+    _ = memoryview
+    has_memoryview = True
+except NameError:
+    has_memoryview = False
 
 orig_util_HAS_SNI = util.HAS_SNI
 orig_connection_ssl_wrap_socket = connection.ssl_wrap_socket
@@ -191,6 +182,11 @@ class WrappedSocket(object):
                 return b''
             else:
                 raise
+        except OpenSSL.SSL.ZeroReturnError as e:
+            if self.connection.get_shutdown() == OpenSSL.SSL.RECEIVED_SHUTDOWN:
+                return b''
+            else:
+                raise
         except OpenSSL.SSL.WantReadError:
             rd, wd, ed = select.select(
                 [self.socket], [], [], self.socket.gettimeout())
@@ -216,13 +212,21 @@ class WrappedSocket(object):
                 continue
 
     def sendall(self, data):
-        while len(data):
-            sent = self._send_until_done(data)
-            data = data[sent:]
+        if has_memoryview and not isinstance(data, memoryview):
+            data = memoryview(data)
+
+        total_sent = 0
+        while total_sent < len(data):
+            sent = self._send_until_done(data[total_sent:total_sent+SSL_WRITE_BLOCKSIZE])
+            total_sent += sent
+
+    def shutdown(self):
+        # FIXME rethrow compatible exceptions should we ever use this
+        self.connection.shutdown()
 
     def close(self):
         if self._makefile_refs < 1:
-            return self.connection.shutdown()
+            return self.connection.close()
         else:
             self._makefile_refs -= 1
 
@@ -263,7 +267,7 @@ def _verify_callback(cnx, x509, err_no, err_depth, return_code):
 
 def ssl_wrap_socket(sock, keyfile=None, certfile=None, cert_reqs=None,
                     ca_certs=None, server_hostname=None,
-                    ssl_version=None):
+                    ssl_version=None, ca_cert_dir=None):
     ctx = OpenSSL.SSL.Context(_openssl_versions[ssl_version])
     if certfile:
         keyfile = keyfile or certfile  # Match behaviour of the normal python ssl library
@@ -272,9 +276,9 @@ def ssl_wrap_socket(sock, keyfile=None, certfile=None, cert_reqs=None,
         ctx.use_privatekey_file(keyfile)
     if cert_reqs != ssl.CERT_NONE:
         ctx.set_verify(_openssl_verify[cert_reqs], _verify_callback)
-    if ca_certs:
+    if ca_certs or ca_cert_dir:
         try:
-            ctx.load_verify_locations(ca_certs, None)
+            ctx.load_verify_locations(ca_certs, ca_cert_dir)
         except OpenSSL.SSL.Error as e:
             raise ssl.SSLError('bad ca_certs: %r' % ca_certs, e)
     else:
@@ -294,10 +298,12 @@ def ssl_wrap_socket(sock, keyfile=None, certfile=None, cert_reqs=None,
         try:
             cnx.do_handshake()
         except OpenSSL.SSL.WantReadError:
-            select.select([sock], [], [])
+            rd, _, _ = select.select([sock], [], [], sock.gettimeout())
+            if not rd:
+                raise timeout('select timed out')
             continue
         except OpenSSL.SSL.Error as e:
-            raise ssl.SSLError('bad handshake', e)
+            raise ssl.SSLError('bad handshake: %r' % e)
         break
 
     return WrappedSocket(cnx, sock)

lib/requests/packages/urllib3/exceptions.py

@@ -112,6 +112,9 @@ class ConnectTimeoutError(TimeoutError):
     "Raised when a socket timeout occurs while connecting to a server"
     pass
 
+class NewConnectionError(ConnectTimeoutError, PoolError):
+    "Raised when we fail to establish a new connection. Usually ECONNREFUSED."
+    pass
 
 class EmptyPoolError(PoolError):
     "Raised when a pool runs out of connections and no more are allowed."
@@ -149,6 +152,11 @@ class SecurityWarning(HTTPWarning):
     pass
 
 
+class SubjectAltNameWarning(SecurityWarning):
+    "Warned when connecting to a host with a certificate missing a SAN."
+    pass
+
+
 class InsecureRequestWarning(SecurityWarning):
     "Warned when making an unverified HTTPS request."
     pass
@@ -157,3 +165,29 @@ class InsecureRequestWarning(SecurityWarning):
 class SystemTimeWarning(SecurityWarning):
     "Warned when system time is suspected to be wrong"
     pass
+
+
+class InsecurePlatformWarning(SecurityWarning):
+    "Warned when certain SSL configuration is not available on a platform."
+    pass
+
+
+class ResponseNotChunked(ProtocolError, ValueError):
+    "Response needs to be chunked in order to read it as chunks."
+    pass
+
+
+class ProxySchemeUnknown(AssertionError, ValueError):
+    "ProxyManager does not support the supplied scheme"
+    # TODO(t-8ch): Stop inheriting from AssertionError in v2.0.
+
+    def __init__(self, scheme):
+        message = "Not supported proxy scheme %s" % scheme
+        super(ProxySchemeUnknown, self).__init__(message)
+
+
+class HeaderParsingError(HTTPError):
+    "Raised by assert_header_parsing, but we convert it to a log.warning statement."
+    def __init__(self, defects, unparsed_data):
+        message = '%s, unparsed data: %r' % (defects or 'Unknown', unparsed_data)
+        super(HeaderParsingError, self).__init__(message)

lib/requests/packages/urllib3/poolmanager.py

@@ -8,7 +8,7 @@ except ImportError:
 from ._collections import RecentlyUsedContainer
 from .connectionpool import HTTPConnectionPool, HTTPSConnectionPool
 from .connectionpool import port_by_scheme
-from .exceptions import LocationValueError
+from .exceptions import LocationValueError, MaxRetryError, ProxySchemeUnknown
 from .request import RequestMethods
 from .util.url import parse_url
 from .util.retry import Retry
@@ -64,6 +64,14 @@ class PoolManager(RequestMethods):
         self.pools = RecentlyUsedContainer(num_pools,
                                            dispose_func=lambda p: p.close())
 
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self.clear()
+        # Return False to re-raise any potential exceptions
+        return False
+
     def _new_pool(self, scheme, host, port):
         """
         Create a new :class:`ConnectionPool` based on host, port and scheme.
@@ -167,7 +175,14 @@ class PoolManager(RequestMethods):
         if not isinstance(retries, Retry):
             retries = Retry.from_int(retries, redirect=redirect)
 
-        kw['retries'] = retries.increment(method, redirect_location)
+        try:
+            retries = retries.increment(method, url, response=response, _pool=conn)
+        except MaxRetryError:
+            if retries.raise_on_redirect:
+                raise
+            return response
+
+        kw['retries'] = retries
         kw['redirect'] = redirect
 
         log.info("Redirecting %s -> %s" % (url, redirect_location))
@@ -212,8 +227,8 @@ class ProxyManager(PoolManager):
             port = port_by_scheme.get(proxy.scheme, 80)
             proxy = proxy._replace(port=port)
 
-        assert proxy.scheme in ("http", "https"), \
-            'Not supported proxy scheme %s' % proxy.scheme
+        if proxy.scheme not in ("http", "https"):
+            raise ProxySchemeUnknown(proxy.scheme)
 
         self.proxy = proxy
         self.proxy_headers = proxy_headers or {}

lib/requests/packages/urllib3/request.py

@@ -71,14 +71,22 @@ class RequestMethods(object):
                                             headers=headers,
                                             **urlopen_kw)
 
-    def request_encode_url(self, method, url, fields=None, **urlopen_kw):
+    def request_encode_url(self, method, url, fields=None, headers=None,
+                           **urlopen_kw):
         """
         Make a request using :meth:`urlopen` with the ``fields`` encoded in
         the url. This is useful for request methods like GET, HEAD, DELETE, etc.
         """
+        if headers is None:
+            headers = self.headers
+
+        extra_kw = {'headers': headers}
+        extra_kw.update(urlopen_kw)
+
         if fields:
             url += '?' + urlencode(fields)
-        return self.urlopen(method, url, **urlopen_kw)
+
+        return self.urlopen(method, url, **extra_kw)
 
     def request_encode_body(self, method, url, fields=None, headers=None,
                             encode_multipart=True, multipart_boundary=None,

lib/requests/packages/urllib3/response.py

@@ -1,13 +1,16 @@
+from contextlib import contextmanager
 import zlib
 import io
 from socket import timeout as SocketTimeout
 
 from ._collections import HTTPHeaderDict
-from .exceptions import ProtocolError, DecodeError, ReadTimeoutError
-from .packages.six import string_types as basestring, binary_type
+from .exceptions import (
+    ProtocolError, DecodeError, ReadTimeoutError, ResponseNotChunked
+)
+from .packages.six import string_types as basestring, binary_type, PY3
+from .packages.six.moves import http_client as httplib
 from .connection import HTTPException, BaseSSLError
-from .util.response import is_fp_closed
-
+from .util.response import is_fp_closed, is_response_to_head
 
 
 class DeflateDecoder(object):
@@ -21,6 +24,9 @@ class DeflateDecoder(object):
         return getattr(self._obj, name)
 
     def decompress(self, data):
+        if not data:
+            return data
+
         if not self._first_try:
             return self._obj.decompress(data)
 
@@ -36,9 +42,23 @@ class DeflateDecoder(object):
                 self._data = None
 
 
+class GzipDecoder(object):
+
+    def __init__(self):
+        self._obj = zlib.decompressobj(16 + zlib.MAX_WBITS)
+
+    def __getattr__(self, name):
+        return getattr(self._obj, name)
+
+    def decompress(self, data):
+        if not data:
+            return data
+        return self._obj.decompress(data)
+
+
 def _get_decoder(mode):
     if mode == 'gzip':
-        return zlib.decompressobj(16 + zlib.MAX_WBITS)
+        return GzipDecoder()
 
     return DeflateDecoder()
 
@@ -76,9 +96,10 @@ class HTTPResponse(io.IOBase):
                  strict=0, preload_content=True, decode_content=True,
                  original_response=None, pool=None, connection=None):
 
-        self.headers = HTTPHeaderDict()
-        if headers:
-            self.headers.update(headers)
+        if isinstance(headers, HTTPHeaderDict):
+            self.headers = headers
+        else:
+            self.headers = HTTPHeaderDict(headers)
         self.status = status
         self.version = version
         self.reason = reason
@@ -100,7 +121,17 @@ class HTTPResponse(io.IOBase):
         if hasattr(body, 'read'):
             self._fp = body
 
-        if preload_content and not self._body:
+        # Are we using the chunked-style of transfer encoding?
+        self.chunked = False
+        self.chunk_left = None
+        tr_enc = self.headers.get('transfer-encoding', '').lower()
+        # Don't incur the penalty of creating a list and then discarding it
+        encodings = (enc.strip() for enc in tr_enc.split(","))
+        if "chunked" in encodings:
+            self.chunked = True
+
+        # We certainly don't want to preload content when the response is chunked.
+        if not self.chunked and preload_content and not self._body:
             self._body = self.read(decode_content=decode_content)
 
     def get_redirect_location(self):
@@ -140,6 +171,76 @@ class HTTPResponse(io.IOBase):
         """
         return self._fp_bytes_read
 
+    def _init_decoder(self):
+        """
+        Set-up the _decoder attribute if necessar.
+        """
+        # Note: content-encoding value should be case-insensitive, per RFC 7230
+        # Section 3.2
+        content_encoding = self.headers.get('content-encoding', '').lower()
+        if self._decoder is None and content_encoding in self.CONTENT_DECODERS:
+            self._decoder = _get_decoder(content_encoding)
+
+    def _decode(self, data, decode_content, flush_decoder):
+        """
+        Decode the data passed in and potentially flush the decoder.
+        """
+        try:
+            if decode_content and self._decoder:
+                data = self._decoder.decompress(data)
+        except (IOError, zlib.error) as e:
+            content_encoding = self.headers.get('content-encoding', '').lower()
+            raise DecodeError(
+                "Received response with content-encoding: %s, but "
+                "failed to decode it." % content_encoding, e)
+
+        if flush_decoder and decode_content and self._decoder:
+            buf = self._decoder.decompress(binary_type())
+            data += buf + self._decoder.flush()
+
+        return data
+
+    @contextmanager
+    def _error_catcher(self):
+        """
+        Catch low-level python exceptions, instead re-raising urllib3
+        variants, so that low-level exceptions are not leaked in the
+        high-level api.
+
+        On exit, release the connection back to the pool.
+        """
+        try:
+            try:
+                yield
+
+            except SocketTimeout:
+                # FIXME: Ideally we'd like to include the url in the ReadTimeoutError but
+                # there is yet no clean way to get at it from this context.
+                raise ReadTimeoutError(self._pool, None, 'Read timed out.')
+
+            except BaseSSLError as e:
+                # FIXME: Is there a better way to differentiate between SSLErrors?
+                if 'read operation timed out' not in str(e):  # Defensive:
+                    # This shouldn't happen but just in case we're missing an edge
+                    # case, let's avoid swallowing SSL errors.
+                    raise
+
+                raise ReadTimeoutError(self._pool, None, 'Read timed out.')
+
+            except HTTPException as e:
+                # This includes IncompleteRead.
+                raise ProtocolError('Connection broken: %r' % e, e)
+        except Exception:
+            # The response may not be closed but we're not going to use it anymore
+            # so close it now to ensure that the connection is released back to the pool.
+            if self._original_response and not self._original_response.isclosed():
+                self._original_response.close()
+
+            raise
+        finally:
+            if self._original_response and self._original_response.isclosed():
+                self.release_conn()
+
     def read(self, amt=None, decode_content=None, cache_content=False):
         """
         Similar to :meth:`httplib.HTTPResponse.read`, but with two additional
@@ -161,12 +262,7 @@ class HTTPResponse(io.IOBase):
             after having ``.read()`` the file object. (Overridden if ``amt`` is
             set.)
         """
-        # Note: content-encoding value should be case-insensitive, per RFC 7230
-        # Section 3.2
-        content_encoding = self.headers.get('content-encoding', '').lower()
-        if self._decoder is None:
-            if content_encoding in self.CONTENT_DECODERS:
-                self._decoder = _get_decoder(content_encoding)
+        self._init_decoder()
         if decode_content is None:
             decode_content = self.decode_content
 
@@ -174,67 +270,37 @@ class HTTPResponse(io.IOBase):
             return
 
         flush_decoder = False
+        data = None
 
-        try:
-            try:
-                if amt is None:
-                    # cStringIO doesn't like amt=None
-                    data = self._fp.read()
+        with self._error_catcher():
+            if amt is None:
+                # cStringIO doesn't like amt=None
+                data = self._fp.read()
+                flush_decoder = True
+            else:
+                cache_content = False
+                data = self._fp.read(amt)
+                if amt != 0 and not data:  # Platform-specific: Buggy versions of Python.
+                    # Close the connection when no data is returned
+                    #
+                    # This is redundant to what httplib/http.client _should_
+                    # already do.  However, versions of python released before
+                    # December 15, 2012 (http://bugs.python.org/issue16298) do
+                    # not properly close the connection in all cases. There is
+                    # no harm in redundantly calling close.
+                    self._fp.close()
                     flush_decoder = True
-                else:
-                    cache_content = False
-                    data = self._fp.read(amt)
-                    if amt != 0 and not data:  # Platform-specific: Buggy versions of Python.
-                        # Close the connection when no data is returned
-                        #
-                        # This is redundant to what httplib/http.client _should_
-                        # already do.  However, versions of python released before
-                        # December 15, 2012 (http://bugs.python.org/issue16298) do
-                        # not properly close the connection in all cases. There is
-                        # no harm in redundantly calling close.
-                        self._fp.close()
-                        flush_decoder = True
-
-            except SocketTimeout:
-                # FIXME: Ideally we'd like to include the url in the ReadTimeoutError but
-                # there is yet no clean way to get at it from this context.
-                raise ReadTimeoutError(self._pool, None, 'Read timed out.')
-
-            except BaseSSLError as e:
-                # FIXME: Is there a better way to differentiate between SSLErrors?
-                if not 'read operation timed out' in str(e):  # Defensive:
-                    # This shouldn't happen but just in case we're missing an edge
-                    # case, let's avoid swallowing SSL errors.
-                    raise
-
-                raise ReadTimeoutError(self._pool, None, 'Read timed out.')
-
-            except HTTPException as e:
-                # This includes IncompleteRead.
-                raise ProtocolError('Connection broken: %r' % e, e)
 
+        if data:
             self._fp_bytes_read += len(data)
 
-            try:
-                if decode_content and self._decoder:
-                    data = self._decoder.decompress(data)
-            except (IOError, zlib.error) as e:
-                raise DecodeError(
-                    "Received response with content-encoding: %s, but "
-                    "failed to decode it." % content_encoding, e)
-
-            if flush_decoder and decode_content and self._decoder:
-                buf = self._decoder.decompress(binary_type())
-                data += buf + self._decoder.flush()
+            data = self._decode(data, decode_content, flush_decoder)
 
             if cache_content:
                 self._body = data
 
-            return data
+        return data
 
-        finally:
-            if self._original_response and self._original_response.isclosed():
-                self.release_conn()
 
     def stream(self, amt=2**16, decode_content=None):
         """
@@ -252,11 +318,15 @@ class HTTPResponse(io.IOBase):
             If True, will attempt to decode the body based on the
             'content-encoding' header.
         """
-        while not is_fp_closed(self._fp):
-            data = self.read(amt=amt, decode_content=decode_content)
+        if self.chunked:
+            for line in self.read_chunked(amt, decode_content=decode_content):
+                yield line
+        else:
+            while not is_fp_closed(self._fp):
+                data = self.read(amt=amt, decode_content=decode_content)
 
-            if data:
-                yield data
+                if data:
+                    yield data
 
     @classmethod
     def from_httplib(ResponseCls, r, **response_kw):
@@ -267,14 +337,17 @@ class HTTPResponse(io.IOBase):
         Remaining parameters are passed to the HTTPResponse constructor, along
         with ``original_response=r``.
         """
+        headers = r.msg
 
-        headers = HTTPHeaderDict()
-        for k, v in r.getheaders():
-            headers.add(k, v)
+        if not isinstance(headers, HTTPHeaderDict):
+            if PY3: # Python 3
+                headers = HTTPHeaderDict(headers.items())
+            else: # Python 2
+                headers = HTTPHeaderDict.from_httplib(headers)
 
         # HTTPResponse objects in Python 3 don't have a .strict attribute
         strict = getattr(r, 'strict', 0)
-        return ResponseCls(body=r,
+        resp = ResponseCls(body=r,
                            headers=headers,
                            status=r.status,
                            version=r.version,
@@ -282,6 +355,7 @@ class HTTPResponse(io.IOBase):
                            strict=strict,
                            original_response=r,
                            **response_kw)
+        return resp
 
     # Backwards-compatibility methods for httplib.HTTPResponse
     def getheaders(self):
@@ -331,3 +405,81 @@ class HTTPResponse(io.IOBase):
         else:
             b[:len(temp)] = temp
             return len(temp)
+
+    def _update_chunk_length(self):
+        # First, we'll figure out length of a chunk and then
+        # we'll try to read it from socket.
+        if self.chunk_left is not None:
+            return
+        line = self._fp.fp.readline()
+        line = line.split(b';', 1)[0]
+        try:
+            self.chunk_left = int(line, 16)
+        except ValueError:
+            # Invalid chunked protocol response, abort.
+            self.close()
+            raise httplib.IncompleteRead(line)
+
+    def _handle_chunk(self, amt):
+        returned_chunk = None
+        if amt is None:
+            chunk = self._fp._safe_read(self.chunk_left)
+            returned_chunk = chunk
+            self._fp._safe_read(2)  # Toss the CRLF at the end of the chunk.
+            self.chunk_left = None
+        elif amt < self.chunk_left:
+            value = self._fp._safe_read(amt)
+            self.chunk_left = self.chunk_left - amt
+            returned_chunk = value
+        elif amt == self.chunk_left:
+            value = self._fp._safe_read(amt)
+            self._fp._safe_read(2)  # Toss the CRLF at the end of the chunk.
+            self.chunk_left = None
+            returned_chunk = value
+        else:  # amt > self.chunk_left
+            returned_chunk = self._fp._safe_read(self.chunk_left)
+            self._fp._safe_read(2)  # Toss the CRLF at the end of the chunk.
+            self.chunk_left = None
+        return returned_chunk
+
+    def read_chunked(self, amt=None, decode_content=None):
+        """
+        Similar to :meth:`HTTPResponse.read`, but with an additional
+        parameter: ``decode_content``.
+
+        :param decode_content:
+            If True, will attempt to decode the body based on the
+            'content-encoding' header.
+        """
+        self._init_decoder()
+        # FIXME: Rewrite this method and make it a class with a better structured logic.
+        if not self.chunked:
+            raise ResponseNotChunked("Response is not chunked. "
+                "Header 'transfer-encoding: chunked' is missing.")
+
+        # Don't bother reading the body of a HEAD request.
+        if self._original_response and is_response_to_head(self._original_response):
+            self._original_response.close()
+            return
+
+        with self._error_catcher():
+            while True:
+                self._update_chunk_length()
+                if self.chunk_left == 0:
+                    break
+                chunk = self._handle_chunk(amt)
+                yield self._decode(chunk, decode_content=decode_content,
+                                   flush_decoder=True)
+
+            # Chunk content ends with \r\n: discard it.
+            while True:
+                line = self._fp.fp.readline()
+                if not line:
+                    # Some sites may not end with '\r\n'.
+                    break
+                if line == b'\r\n':
+                    break
+
+            # We read everything; close the "file".
+            if self._original_response:
+                self._original_response.close()

lib/requests/packages/urllib3/util/connection.py

@@ -60,6 +60,8 @@ def create_connection(address, timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
     """
 
     host, port = address
+    if host.startswith('['):
+        host = host.strip('[]')
     err = None
     for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM):
         af, socktype, proto, canonname, sa = res
@@ -78,15 +80,16 @@ def create_connection(address, timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
             sock.connect(sa)
             return sock
 
-        except socket.error as _:
-            err = _
+        except socket.error as e:
+            err = e
             if sock is not None:
                 sock.close()
+                sock = None
 
     if err is not None:
         raise err
-    else:
-        raise socket.error("getaddrinfo returns an empty list")
+
+    raise socket.error("getaddrinfo returns an empty list")
 
 
 def _set_socket_options(sock, options):

lib/requests/packages/urllib3/util/response.py

@@ -1,3 +1,8 @@
+from ..packages.six.moves import http_client as httplib
+
+from ..exceptions import HeaderParsingError
+
+
 def is_fp_closed(obj):
     """
     Checks whether a given file-like object is closed.
@@ -20,3 +25,49 @@ def is_fp_closed(obj):
         pass
 
     raise ValueError("Unable to determine whether fp is closed.")
+
+
+def assert_header_parsing(headers):
+    """
+    Asserts whether all headers have been successfully parsed.
+    Extracts encountered errors from the result of parsing headers.
+
+    Only works on Python 3.
+
+    :param headers: Headers to verify.
+    :type headers: `httplib.HTTPMessage`.
+
+    :raises urllib3.exceptions.HeaderParsingError:
+        If parsing errors are found.
+    """
+
+    # This will fail silently if we pass in the wrong kind of parameter.
+    # To make debugging easier add an explicit check.
+    if not isinstance(headers, httplib.HTTPMessage):
+        raise TypeError('expected httplib.Message, got {}.'.format(
+            type(headers)))
+
+    defects = getattr(headers, 'defects', None)
+    get_payload = getattr(headers, 'get_payload', None)
+
+    unparsed_data = None
+    if get_payload:  # Platform-specific: Python 3.
+        unparsed_data = get_payload()
+
+    if defects or unparsed_data:
+        raise HeaderParsingError(defects=defects, unparsed_data=unparsed_data)
+
+
+def is_response_to_head(response):
+    """
+    Checks, wether a the request of a response has been a HEAD-request.
+    Handles the quirks of AppEngine.
+
+    :param conn:
+    :type conn: :class:`httplib.HTTPResponse`
+    """
+    # FIXME: Can we do this somehow without accessing private httplib _method?
+    method = response._method
+    if isinstance(method, int):  # Platform-specific: Appengine
+        return method == 3
+    return method.upper() == 'HEAD'

lib/requests/packages/urllib3/util/retry.py

@@ -94,7 +94,7 @@ class Retry(object):
 
         seconds. If the backoff_factor is 0.1, then :func:`.sleep` will sleep
         for [0.1s, 0.2s, 0.4s, ...] between retries. It will never be longer
-        than :attr:`Retry.MAX_BACKOFF`.
+        than :attr:`Retry.BACKOFF_MAX`.
 
         By default, backoff is disabled (set to 0).
 
@@ -190,7 +190,7 @@ class Retry(object):
         return isinstance(err, (ReadTimeoutError, ProtocolError))
 
     def is_forced_retry(self, method, status_code):
-        """ Is this method/response retryable? (Based on method/codes whitelists)
+        """ Is this method/status code retryable? (Based on method/codes whitelists)
         """
         if self.method_whitelist and method.upper() not in self.method_whitelist:
             return False

lib/requests/packages/urllib3/util/ssl_.py

@@ -1,17 +1,25 @@
 from binascii import hexlify, unhexlify
-from hashlib import md5, sha1
+from hashlib import md5, sha1, sha256
 
-from ..exceptions import SSLError
+from ..exceptions import SSLError, InsecurePlatformWarning
 
 
 SSLContext = None
 HAS_SNI = False
 create_default_context = None
 
+# Maps the length of a digest to a possible hash function producing this digest
+HASHFUNC_MAP = {
+    32: md5,
+    40: sha1,
+    64: sha256,
+}
+
 import errno
-import ssl
+import warnings
 
 try:  # Test for SSL features
+    import ssl
     from ssl import wrap_socket, CERT_NONE, PROTOCOL_SSLv23
     from ssl import HAS_SNI  # Has SNI?
 except ImportError:
@@ -24,14 +32,24 @@ except ImportError:
     OP_NO_SSLv2, OP_NO_SSLv3 = 0x1000000, 0x2000000
     OP_NO_COMPRESSION = 0x20000
 
-try:
-    from ssl import _DEFAULT_CIPHERS
-except ImportError:
-    _DEFAULT_CIPHERS = (
-        'ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+HIGH:'
-        'DH+HIGH:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+HIGH:RSA+3DES:ECDH+RC4:'
-        'DH+RC4:RSA+RC4:!aNULL:!eNULL:!MD5'
-    )
+# A secure default.
+# Sources for more information on TLS ciphers:
+#
+# - https://wiki.mozilla.org/Security/Server_Side_TLS
+# - https://www.ssllabs.com/projects/best-practices/index.html
+# - https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
+#
+# The general intent is:
+# - Prefer cipher suites that offer perfect forward secrecy (DHE/ECDHE),
+# - prefer ECDHE over DHE for better performance,
+# - prefer any AES-GCM over any AES-CBC for better performance and security,
+# - use 3DES as fallback which is secure but slow,
+# - disable NULL authentication, MD5 MACs and DSS for security reasons.
+DEFAULT_CIPHERS = (
+    'ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+HIGH:'
+    'DH+HIGH:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+HIGH:RSA+3DES:!aNULL:'
+    '!eNULL:!MD5'
+)
 
 try:
     from ssl import SSLContext  # Modern SSL?
@@ -39,7 +57,8 @@ except ImportError:
     import sys
 
     class SSLContext(object):  # Platform-specific: Python 2 & 3.1
-        supports_set_ciphers = sys.version_info >= (2, 7)
+        supports_set_ciphers = ((2, 7) <= sys.version_info < (3,) or
+                                (3, 2) <= sys.version_info)
 
         def __init__(self, protocol_version):
             self.protocol = protocol_version
@@ -56,8 +75,11 @@ except ImportError:
             self.certfile = certfile
             self.keyfile = keyfile
 
-        def load_verify_locations(self, location):
-            self.ca_certs = location
+        def load_verify_locations(self, cafile=None, capath=None):
+            self.ca_certs = cafile
+
+            if capath is not None:
+                raise SSLError("CA directories not supported in older Pythons")
 
         def set_ciphers(self, cipher_suite):
             if not self.supports_set_ciphers:
@@ -69,6 +91,14 @@ except ImportError:
             self.ciphers = cipher_suite
 
         def wrap_socket(self, socket, server_hostname=None):
+            warnings.warn(
+                'A true SSLContext object is not available. This prevents '
+                'urllib3 from configuring SSL appropriately and may cause '
+                'certain SSL connections to fail. For more information, see '
+                'https://urllib3.readthedocs.org/en/latest/security.html'
+                '#insecureplatformwarning.',
+                InsecurePlatformWarning
+            )
             kwargs = {
                 'keyfile': self.keyfile,
                 'certfile': self.certfile,
@@ -92,30 +122,21 @@ def assert_fingerprint(cert, fingerprint):
         Fingerprint as string of hexdigits, can be interspersed by colons.
     """
 
-    # Maps the length of a digest to a possible hash function producing
-    # this digest.
-    hashfunc_map = {
-        16: md5,
-        20: sha1
-    }
-
     fingerprint = fingerprint.replace(':', '').lower()
-    digest_length, odd = divmod(len(fingerprint), 2)
-
-    if odd or digest_length not in hashfunc_map:
-        raise SSLError('Fingerprint is of invalid length.')
+    digest_length = len(fingerprint)
+    hashfunc = HASHFUNC_MAP.get(digest_length)
+    if not hashfunc:
+        raise SSLError(
+            'Fingerprint of invalid length: {0}'.format(fingerprint))
 
     # We need encode() here for py32; works on py2 and p33.
     fingerprint_bytes = unhexlify(fingerprint.encode())
 
-    hashfunc = hashfunc_map[digest_length]
-
     cert_digest = hashfunc(cert).digest()
 
-    if not cert_digest == fingerprint_bytes:
+    if cert_digest != fingerprint_bytes:
         raise SSLError('Fingerprints did not match. Expected "{0}", got "{1}".'
-                       .format(hexlify(fingerprint_bytes),
-                               hexlify(cert_digest)))
+                       .format(fingerprint, hexlify(cert_digest)))
 
 
 def resolve_cert_reqs(candidate):
@@ -157,7 +178,7 @@ def resolve_ssl_version(candidate):
     return candidate
 
 
-def create_urllib3_context(ssl_version=None, cert_reqs=ssl.CERT_REQUIRED,
+def create_urllib3_context(ssl_version=None, cert_reqs=None,
                            options=None, ciphers=None):
     """All arguments have the same meaning as ``ssl_wrap_socket``.
 
@@ -194,6 +215,9 @@ def create_urllib3_context(ssl_version=None, cert_reqs=ssl.CERT_REQUIRED,
     """
     context = SSLContext(ssl_version or ssl.PROTOCOL_SSLv23)
 
+    # Setting the default here, as we may have no ssl module on import
+    cert_reqs = ssl.CERT_REQUIRED if cert_reqs is None else cert_reqs
+
     if options is None:
         options = 0
         # SSLv2 is easily broken and is considered harmful and dangerous
@@ -207,20 +231,23 @@ def create_urllib3_context(ssl_version=None, cert_reqs=ssl.CERT_REQUIRED,
     context.options |= options
 
     if getattr(context, 'supports_set_ciphers', True):  # Platform-specific: Python 2.6
-        context.set_ciphers(ciphers or _DEFAULT_CIPHERS)
+        context.set_ciphers(ciphers or DEFAULT_CIPHERS)
 
     context.verify_mode = cert_reqs
     if getattr(context, 'check_hostname', None) is not None:  # Platform-specific: Python 3.2
-        context.check_hostname = (context.verify_mode == ssl.CERT_REQUIRED)
+        # We do our own verification, including fingerprints and alternative
+        # hostnames. So disable it here
+        context.check_hostname = False
     return context
 
 
 def ssl_wrap_socket(sock, keyfile=None, certfile=None, cert_reqs=None,
                     ca_certs=None, server_hostname=None,
-                    ssl_version=None, ciphers=None, ssl_context=None):
+                    ssl_version=None, ciphers=None, ssl_context=None,
+                    ca_cert_dir=None):
     """
-    All arguments except for server_hostname and ssl_context have the same
-    meaning as they do when using :func:`ssl.wrap_socket`.
+    All arguments except for server_hostname, ssl_context, and ca_cert_dir have
+    the same meaning as they do when using :func:`ssl.wrap_socket`.
 
     :param server_hostname:
         When SNI is supported, the expected hostname of the certificate
@@ -230,15 +257,19 @@ def ssl_wrap_socket(sock, keyfile=None, certfile=None, cert_reqs=None,
     :param ciphers:
         A string of ciphers we wish the client to support. This is not
         supported on Python 2.6 as the ssl module does not support it.
+    :param ca_cert_dir:
+        A directory containing CA certificates in multiple separate files, as
+        supported by OpenSSL's -CApath flag or the capath argument to
+        SSLContext.load_verify_locations().
     """
     context = ssl_context
     if context is None:
         context = create_urllib3_context(ssl_version, cert_reqs,
                                          ciphers=ciphers)
 
-    if ca_certs:
+    if ca_certs or ca_cert_dir:
         try:
-            context.load_verify_locations(ca_certs)
+            context.load_verify_locations(ca_certs, ca_cert_dir)
         except IOError as e:  # Platform-specific: Python 2.6, 2.7, 3.2
             raise SSLError(e)
         # Py33 raises FileNotFoundError which subclasses OSError
@@ -247,6 +278,7 @@ def ssl_wrap_socket(sock, keyfile=None, certfile=None, cert_reqs=None,
             if e.errno == errno.ENOENT:
                 raise SSLError(e)
             raise
+
     if certfile:
         context.load_cert_chain(certfile, keyfile)
     if HAS_SNI:  # Platform-specific: OpenSSL with enabled SNI

lib/requests/packages/urllib3/util/url.py

@@ -15,6 +15,8 @@ class Url(namedtuple('Url', url_attrs)):
 
     def __new__(cls, scheme=None, auth=None, host=None, port=None, path=None,
                 query=None, fragment=None):
+        if path and not path.startswith('/'):
+            path = '/' + path
         return super(Url, cls).__new__(cls, scheme, auth, host, port, path,
                                        query, fragment)