Communicate between app and server

I have had problems with the hosting that I took from 000webhost server. I use from this host to communicate between my android application and the server. Until 3 days ago, everything worked well, but unfortunately in the last few days my application was unable to communicate with the server. However, I have not made any changes in my programs. I generate json object in server side and my App read json object another side. Url request works in web browser(of course by anti filter), but doesn’t work in App.