Why does the robots.txt file without www appear empty?

Question

Heroku

Why when I want to view the robots.txt file on my site like this http://name.com/robots.txt it is empty but when I add www everything works fine i.e. http://www.name.com /robots.txt how to fix it?

Answer 1

the most logical assumption is two different files.
In the second case, there is also a subdirectory - what robots.txt does in the subdirectory is not clear ..