Thanks @Lucian_Dinu, @AndyG , for your help. Anyd, your suggestions was correct indeed, so problem solved (at least with the redirect for robots.txt - the strange ways of operating of browsers won’t probably change 
).
kind rgerads
Mark
Thanks @Lucian_Dinu, @AndyG , for your help. Anyd, your suggestions was correct indeed, so problem solved (at least with the redirect for robots.txt - the strange ways of operating of browsers won’t probably change ).
kind rgerads
Mark