FCGI - FastCGI File is a file extension that is used for CGI standards. You can use it for robust handling of different web server requests that are made. You can also use this extension to support different languages that are written in Perl. They also consist of codes and interfaces for support. You will be able to balance out these interfaces as well and load various servers at one time. You have a few options when dealing with this extension. You can go through a web server or through web server extensions. The choice is up to you.