} catch (final IllegalArgumentException e) {
            logger.warn("Invalid canonical URL: baseUrl={}, canonicalUrl={}", baseUrl, canonicalUrl, e);
        }
        return null;
    }

    /**
     * Removes HTML comment tags from the content.
     *
     * @param content the content to process
     * @return the content with comment tags removed
     */
    protected String removeCommentTag(final String content) {

        } else {
            value = escaped;
        }
        return value.replaceAll(escapedHighlightPre, highlightTagPre).replaceAll(escapedHighlightPost, highlightTagPost);
    }

    /**
     * Removes highlight tags from a string.
     *
     * @param str the string containing highlight tags
     * @return the string with highlight tags removed
     */
    protected String removeHighlightTag(final String str) {

            if (stateDataInSession != null) {
                return stateDataInSession;
            }
        }
        throw new SsoLoginException("could not validate state");
    }

    /**
     * Removes and returns state data from the HTTP session.
     * @param session The HTTP session.
     * @param state The state parameter to remove.
     * @return The removed state data or null if not found.
     */