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What is FastCGI

 FastCGI is an extension of the Common Gateway Interface (CGI) that was developed by a now-defunct company called Open Market. FastCGI is freely available as an open standard. Addresses certain deficiencies in CGI that limit performance.




Unlike CGI, FastCGI does not create a new process for each request, thus minimizing the overhead of creating and destroying processes each time a request is received. This overhead can be circumvented by using application program interfaces (APIs) such as the Netscape server application programming interface (NSAPI) or the Internet server application programming interface (ISAPI), but because these They are proprietary, there is an additional learning curve and limitations on the supported languages ​​to be considered. Another shortcoming of CGI is the fact that certain reuse cases, such as database connections or caching techniques, cannot be obtained. Request handling can be up to 30 times faster using FastCGI over conventional CGI.




With FastCGI, multiple requests can be handled over a single connection, known as multiplexing. Alternatively, multiple connections can be used. Requests are transmitted using File Transfer Protocol (FTP) or sockets. The same connection is used to return the response.

Although the connection might be closed at this point, the web server and the process still persist. This offers many advantages. For example, it means that the server and the application process can be shut down or restarted separately.




 FastCGI was originally developed by Open Market and implemented in their web server offering. However, the interface can be deployed on any server, and it was soon installed on several other web servers in the industry. FastCGI is highly compatible with distributed computing, so a FastCGI application can run on a separate server for the web service. This offers all the benefits of improving system availability, improving scalability, and increasing system security because the components are isolated. By using remote FastCGI, there is less administration because the internal network can handle running applications.

In the same way that a CGI application can generate a response from a Hypertext Transfer Protocol (HTTP) request, so can FastCGI. It also handles tasks like verifying authentication and converting data types. These tasks are handled by roles, which can be freely added and expanded.

FastCGI is simple to understand and will run with almost any programming language. Processes are isolated, so servers cannot crash due to application-specific problems. Any application built with the FastCGI framework is older with old servers running CGI. Additionally, the application library is designed to simplify the migration of CGI applications.

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