old_contents: from marnadi.http import Header, Headers
  from marnadi.utils import to_bytes
  
  
  class Error(Exception):
  
      __slots__ = 'status', 'data', '__weakref__'
  
      headers = Headers(
          ('Content-Type', Header('text/plain', charset='utf-8')),
      )
  
      def __init__(
          self,
          status='500 Internal Server Error',
          data=None,
          headers=(),
      ):
          self.status = status
          self.data = to_bytes(data or status)
          self.update_headers(headers)
  
      def __len__(self):
          return 1
  
      def __iter__(self):
          yield to_bytes(self.data)
  
      def update_headers(self, headers):
          self.headers.extend(headers)
          self.headers['Content-Length'] = len(self.data)
  
new_contents: from marnadi.http import Header, Headers
  from marnadi.utils import to_bytes
  
  
  class Error(Exception):
  
      __slots__ = 'status', 'data', '__weakref__'
  
      default_status = '500 Internal Server Error'
  
      headers = Headers(
          ('Content-Type', Header('text/plain', charset='utf-8')),
      )
  
      def __init__(self, status=None, data=None, headers=()):
          self.status = status or self.default_status
          self.data = to_bytes(data or status)
          self.update_headers(headers)
  
      def __len__(self):
          return 1
  
      def __iter__(self):
          yield to_bytes(self.data)
  
      def update_headers(self, headers):
          self.headers.extend(headers)
          self.headers['Content-Length'] = len(self.data)
  
subject: store default status as class attribute