Selfhosted site visible from the world but not from site's network

by public IP or site domain i get this error:

This page isn’t working

XXXXXX didn’t send any data.

ERR_EMPTY_RESPONSE

from the world it works

i get it from every device on my network

localhost works

any tips??? i cleaned all, certs, caches, browsers, cookies, flushes dns. in fact if it happens on every network device, then these are two culprits:

- confgiruation files for XAMPP

or

- my network

prob the only thing i can do network wise is resetting the router but idk would it help? (i turned it off and on already) as far as i know reset only resets router settings on the router's local page but who knows

as for XAMPP settings, theyre pretty much default