in src/main/java/org/apache/sling/auth/xing/login/impl/XingLoginAuthenticationHandler.java [214:222]
public boolean requestCredentials(final HttpServletRequest request, final HttpServletResponse response) throws IOException {
logger.debug("request credentials");
if (!loginPath.equals(request.getServletPath())) {
final String target = request.getContextPath().concat(loginPath);
logger.debug("redirecting to '{}'", target);
AuthUtil.sendRedirect(request, response, target, null);
}
return true;
}