Explanation of what is happening:
XAMPP with Apache on, when I click on live preview of Brackets and type the URL : http://localhost:80/demo/_practice-app/ , it appears again with modal requesting the URL and it repeats itself, it seems that it does not accept the URL:
Howeverwhenopeningtheurlbythetraditionalbrowseritworksnormally.
Selfexplanatoryvideobelow: link