docs: def unpack(value):
      """Return a three tuple of data, code, and headers"""
      if not isinstance(value, tuple):
          return value, 200, {}
  
      try:
          data, code, headers = value
          return data, code, headers
      except ValueError:
          pass
  
      try:
          data, code = value
          return data, code, {}
      except ValueError:
          pass
  
      return value, 200, {}