FastCGI is a fast, open, and secure Web server interface that solves the performance problems inherent in CGI without introducing any of the new problems associated with writing applications to lower-level Web server APIs. Modules to support FastCGI can be plugged into Web server APIs such as Apache API, NSAPI, and ISAPI. Key considerations in designing FastCGI included minimizing the cost of migrating CGI applications (including applications written in popular scripting languages such as Perl), supporting both single-threaded and multi-threaded application programming, supporting distributed configurations for scaling and high availability, and generalizing the roles that gateway applications can play beyond CGI's "responder" role.
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