A privilege-separating HTTP server

Webservers hosting multiple websites on a single machine have to solve a problem of privilege separation between users. Most implementations have a single system user, which is dedicated to serving all requests. There are many solutions trying to run user scripts or requests in the context of the appropriate user. However, most of them are not suitable because of low performance, or the level of user separation is not sufficient. We focused on Apache HTTP Server, one of the most widespread webservers, with the goal of implementing a solution that would allow the administrator to separate users at the level of the file system