setting for hhvm.server.default_document not registering

[Choongkyu]

hello. I have this setting in my server.ini

hhvm.server.default_document = /var/www/src/index.hack

but unfortunately, when going to localhost:8080 on my browser, I get a 404 error. I'm able to run this without docker with no issues however. The current workaround I have is setting hhvm.server.source_root=/var/www/src and then accessing localhost:8080/index.hack. I was wondering how I can resolve this.