Connect to Arduino from appInventor by rederecting

Good morning everyone,

I'm working on a project and I need to connect to An arduino Wifi server from an Android App.
Because my teacher is a jerk and didn't teach us any useful programmation langage other than the Arduino c++, I'm using ai2.appinventor.mit.edu (App Inventor) , a graphic programmation application.

The issue is that I know App Inventor isn't able to connect to a server with its IP adress and my teacher don't want to pay a Domain name for one month.

So, is it possible to use one of those free wesite creator or something that can redirect the information so App Inventor would send the data to the website and the website would send it to my Arduino card?
Do you have any other idea to redirect the requests with a domain name?

thank you, have a nice day.