revert to older requests version

lib/requests/exceptions.py

@@ -5,17 +5,19 @@ requests.exceptions
 ~~~~~~~~~~~~~~~~~~~
 
 This module contains the set of Requests' exceptions.
+
 """
-from urllib3.exceptions import HTTPError as BaseHTTPError
+from .packages.urllib3.exceptions import HTTPError as BaseHTTPError
 
 
 class RequestException(IOError):
     """There was an ambiguous exception that occurred while handling your
-    request.
-    """
+    request."""
 
     def __init__(self, *args, **kwargs):
-        """Initialize RequestException with `request` and `response` objects."""
+        """
+        Initialize RequestException with `request` and `response` objects.
+        """
         response = kwargs.pop('response', None)
         self.response = response
         self.request = kwargs.pop('request', None)
@@ -78,15 +80,7 @@ class InvalidSchema(RequestException, ValueError):
 
 
 class InvalidURL(RequestException, ValueError):
-    """The URL provided was somehow invalid."""
-
-
-class InvalidHeader(RequestException, ValueError):
-    """The header value provided was somehow invalid."""
-
-
-class InvalidProxyURL(InvalidURL):
-    """The proxy URL provided is invalid."""
+    """ The URL provided was somehow invalid. """
 
 
 class ChunkedEncodingError(RequestException):
@@ -103,24 +97,3 @@ class StreamConsumedError(RequestException, TypeError):
 
 class RetryError(RequestException):
     """Custom retries logic failed"""
-
-
-class UnrewindableBodyError(RequestException):
-    """Requests encountered an error when trying to rewind a body"""
-
-# Warnings
-
-
-class RequestsWarning(Warning):
-    """Base warning for Requests."""
-    pass
-
-
-class FileModeWarning(RequestsWarning, DeprecationWarning):
-    """A file was opened in text mode, but Requests determined its binary length."""
-    pass
-
-
-class RequestsDependencyWarning(RequestsWarning):
-    """An imported dependency doesn't match the expected version range."""
-    pass