code: def bleach_clean(stream):
      
      return bleach.clean(
          stream,
          tags=current_app.config['MD_ALLOWED_TAGS'],
          attributes=current_app.config['MD_ALLOWED_ATTRIBUTES'],
          styles=current_app.config['MD_ALLOWED_STYLES'],
          strip_comments=False)
docs: Sanitize malicious attempts but keep the `EXCERPT_TOKEN`.
      By default, only keeps `bleach.ALLOWED_TAGS`.