old_contents: # -*- coding: utf-8 -*-
  """
  hyper/http20/exceptions
  ~~~~~~~~~~~~~~~~~~~~~~~
  
  This defines exceptions used in the HTTP/2 portion of hyper.
  """
  class HTTP20Error(Exception):
      """
      The base class for all of ``hyper``'s HTTP/2-related exceptions.
      """
      pass
  
  
  class HPACKEncodingError(HTTP20Error):
      """
      An error has been encountered while performing HPACK encoding.
      """
      pass
  
  
  class HPACKDecodingError(HTTP20Error):
      """
      An error has been encountered while performing HPACK decoding.
      """
      pass
  
  class ConnectionError(HTTP20Error):
      """
      The remote party signalled an error affecting the entire HTTP/2
      connection, and the connection has been closed.
      """
      pass
  
new_contents: # -*- coding: utf-8 -*-
  """
  hyper/http20/exceptions
  ~~~~~~~~~~~~~~~~~~~~~~~
  
  This defines exceptions used in the HTTP/2 portion of hyper.
  """
  class HTTP20Error(Exception):
      """
      The base class for all of ``hyper``'s HTTP/2-related exceptions.
      """
      pass
  
  
  class HPACKEncodingError(HTTP20Error):
      """
      An error has been encountered while performing HPACK encoding.
      """
      pass
  
  
  class HPACKDecodingError(HTTP20Error):
      """
      An error has been encountered while performing HPACK decoding.
      """
      pass
  
  class ConnectionError(HTTP20Error):
      """
      The remote party signalled an error affecting the entire HTTP/2
      connection, and the connection has been closed.
      """
      pass
  
  class ProtocolError(HTTP20Error):
      """
      The remote party violated the HTTP/2 protocol.
      """
      pass
  
subject: Add ProtocolError exception.