Add 'requests' library to third_party.

third_party/requests/exceptions.py

Index: third_party/requests/exceptions.py
diff --git a/third_party/requests/exceptions.py b/third_party/requests/exceptions.py
new file mode 100644
index 0000000000000000000000000000000000000000..c0588f6aedec47f18553f186c742afba5a256065
--- /dev/null
+++ b/third_party/requests/exceptions.py
@@ -0,0 +1,55 @@
+# -*- coding: utf-8 -*-
+
+"""
+requests.exceptions
+~~~~~~~~~~~~~~~~~~~
+
+This module contains the set of Requests' exceptions.
+
+"""
+
+
+class RequestException(RuntimeError):
+    """There was an ambiguous exception that occurred while handling your
+    request."""
+
+
+class HTTPError(RequestException):
+    """An HTTP error occurred."""
+
+    def __init__(self, *args, **kwargs):
+        """ Initializes HTTPError with optional `response` object. """
+        self.response = kwargs.pop('response', None)
+        super(HTTPError, self).__init__(*args, **kwargs)
+
+
+class ConnectionError(RequestException):
+    """A Connection error occurred."""
+
+
+class SSLError(ConnectionError):
+    """An SSL error occurred."""
+
+
+class Timeout(RequestException):
+    """The request timed out."""
+
+
+class URLRequired(RequestException):
+    """A valid URL is required to make a request."""
+
+
+class TooManyRedirects(RequestException):
+    """Too many redirects."""
+
+
+class MissingSchema(RequestException, ValueError):
+    """The URL schema (e.g. http or https) is missing."""
+
+
+class InvalidSchema(RequestException, ValueError):
+    """See defaults.py for valid schemas."""
+
+
+class InvalidURL(RequestException, ValueError):
+    """ The URL provided was somehow invalid. """