Yess, because I found lots of tutorials about running REST API but non of them matching with my system. For example: Tutorial says: "nano /etc/apache2/sites-available/example.conf". In my system I'm getting : No such a file or directory error. After a few research I found something. It wasn't about Plesk it was about CentOs. The same file is located in: /etc/httpd/conf/httpd.conf . And this file so complicated. I couldn't understand it. I doubt about if I doing something wrong my system may crash. I have lots of important web-sites in my Plesk. Please help me