Save infos via html

Hello everyone,
as said there : Write To File on server from HTML? - Platform & Builds - Unreal Engine Forums I’ve got some issues with saving data through my game.

This post takes the problem from another view :
the game will be hosted on a website (probably HTML exported). Each player can play without downloading nor installing the game, just visiting the website.

Here is the question : what is the best way to store gamedata on the server ?
I mean scores or informations about each player game. For now I’ve tried to create a *.txt file but it only works with win development, not HTML.
Should I develop the game so that each player connects to a dedicated server ?
Is there a best way ?
Another client-server method ?

Thanks a lot.