/usr/share/lua/5.2/http/headers.lua is in lua-http 0.1-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/lua/5.2/http/../../5.1/http/headers.lua
/usr/share/lua/5.2/http/../../5.1/http/headers.lua