\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{luainputenc}
\usepackage{url}
\usepackage{amsmath}
%\usepackage{luatexbase}
% \directlua{%
% 	require "luatexbase.mcb"
% 	local patch_latin1 = require "inputcallback"
% 	luatexbase.add_to_callback("open_read_file", patch_latin1, "Convert html4.4ht to utf8")
% }
\usepackage[czech]{babel}
\begin{document}
Příliš
\end{document}
