How to configure that?

the files xxx-yyy-ddd-hhh and xxx-yyy-ddd-hhh.html have the same html code in it.


Typing example.com/xxx-yyy-ddd-hhh.html in the browser is OK.

Typing example.com/xxx-yyy-ddd-hhh in the browser get the wronge content-type application/octet-stream.
A text/html content-type is need.