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diff --git a/src/python/_framework/face/exceptions.py b/src/python/_framework/face/exceptions.py
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+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Exceptions used in the Face layer of RPC Framework."""
+
+import abc
+
+
+class NoSuchMethodError(Exception):
+  """Raised by customer code to indicate an unrecognized RPC method name.
+
+  Attributes:
+    name: The unrecognized name.
+  """
+
+  def __init__(self, name):
+    """Constructor.
+
+    Args:
+      name: The unrecognized RPC method name.
+    """
+    super(NoSuchMethodError, self).__init__()
+    self.name = name
+
+
+class RpcError(Exception):
+  """Common super type for all exceptions raised by the Face layer.
+
+  Only RPC Framework should instantiate and raise these exceptions.
+  """
+  __metaclass__ = abc.ABCMeta
+
+
+class CancellationError(RpcError):
+  """Indicates that an RPC has been cancelled."""
+
+
+class ExpirationError(RpcError):
+  """Indicates that an RPC has expired ("timed out")."""
+
+
+class NetworkError(RpcError):
+  """Indicates that some error occurred on the network."""
+
+
+class ServicedError(RpcError):
+  """Indicates that the Serviced failed in the course of an RPC."""
+
+
+class ServicerError(RpcError):
+  """Indicates that the Servicer failed in the course of servicing an RPC."""