docs: def raw(mime='application/octet-stream'):
      '''
      Constructs a decorator that marks the fn
      as raw response format
      '''
      def dfn(fn):
          tags = getattr(fn, 'tags', set())
          tags.add('raw')
          fn.tags = tags
          fn.mime = getattr(fn, 'mime', mime)
          return fn
      return dfn