https://www.digitalocean.com/community/tutorials/how-to-install-the-apache-web-server-on-ubuntu-18-04 - installing apache https://habr.com/post/193242/ - making simpleRESTful API on Flask https://habr.com/post/246699/ - about flask http://flask.pocoo.org/docs/1.0/deploying/mod_wsgi/ - connecting Apche and Flask thrue WSGI https://modwsgi.readthedocs.io/en/develop/user-guides/quick-installation-guide.html - wsgi installlation guide https://www.youtube.com/watch?v=iVGtJOC71Fw - visoe how to configure wsgi and flask app https://www.digitalocean.com/community/tutorials/how-to-deploy-a-flask-application-on-an-ubuntu-vps#step-one%E2%80%94-install-and-enable-mod_wsgi - written instruction of deploying flask a
sudo /etc/init.d/apache2 restart - apache restart
https://ru.stackoverflow.com/questions/769385/forbidden-you-dont-have-permission-to-access-on-this-server-%D0%BD%D0%B0-%D0%BB%D0%BE%D0%BA%D0%B0%D0%BB%D1%8C%D0%BD%D0%BE%D0%BC-%D1%81%D0%B5%D1%80%D0%B2 - apache with custom folder
https://www.dataquest.io/blog/python-api-tutorial/ - requests library tutorial