hash = StringUtil.EMPTY;
        }

        if (!isFileSystemPath(targetUrl)) {
            return HtmlResponse.fromRedirectPathAsIs(DocumentUtil.encodeUrl(targetUrl + hash));
        }
        if (!fessConfig.isSearchFileProxyEnabled()) {
            return HtmlResponse.fromRedirectPathAsIs(targetUrl + hash);
        }
        final ViewHelper viewHelper = ComponentUtil.getViewHelper();
        try {

                request.getSession().setAttribute(SAML_STATE, UuidUtil.create());
                return new ActionResponseCredential(() -> HtmlResponse.fromRedirectPathAsIs(loginUrl));
            } catch (final Exception e) {
                throw new SsoLoginException("Invalid SAML redirect URL.", e);
            }

        }).orElseGet(() -> null);
    }

    /**

                    }
                }
                return null;
            }

            return new ActionResponseCredential(() -> HtmlResponse.fromRedirectPathAsIs(getAuthUrl(request)));
        }).orElse(null);
    }

    /**
     * Generates the Azure AD authorization URL for the authentication request.
     * @param request The HTTP servlet request.