code: def absolute_urls(html):
      
  
      from bs4 import BeautifulSoup
      from yacms.core.request import current_request
  
      request = current_request()
      if request is not None:
          dom = BeautifulSoup(html, "html.parser")
          for tag, attr in ABSOLUTE_URL_TAGS.items():
              for node in dom.findAll(tag):
                  url = node.get(attr, "")
                  if url:
                      node[attr] = request.build_absolute_uri(url)
          html = str(dom)
      return html
docs: Converts relative URLs into absolute URLs. Used for RSS feeds to
      provide more complete HTML for item descriptions, but could also
      be used as a general richtext filter.