code: def unquote_header_value(value):
      r
      if value and value[0] == value[-1] == '"':
          # this is not the real unquoting, but fixing this so that the
          # RFC is met will result in bugs with internet explorer and
          # probably some other browsers as well.  IE for example is
          # uploading files with "C:\foo\bar.txt" as filename
          value = value[1:-1].replace('\\\\', '\\').replace('\\"', '"')
      return value
docs: r"""Unquotes a header value.  (Reversal of :func:`quote_header_value`).
      This does not use the real unquoting but what browsers are actually
      using for quoting.
  
      :param value: the header value to unquote.