code: def _get_postvalue_from_absoluteURI(url):
      
      cache = _get_postvalue_from_absoluteURI.cache
      path = cache.get(url, '')
      if not path:
          scheme,authpath = url.split('://')
          s = authpath.split('/', 1)
          if len(s) == 2: path = '/%s' %s[1]
          if len(cache) > _get_postvalue_from_absoluteURI.MAXLEN:cache.clear()
          cache[url] = path
      return path
docs: Bug [ 1513000 ] POST Request-URI not limited to "abs_path"
      Request-URI = "*" | absoluteURI | abs_path | authority
      
      Not a complete solution, but it seems to work with all known
      implementations.  ValueError thrown if bad uri.