CGI, FastCGI, SCGI and WSGI

HN LEE

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May 16, 2020

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Background of CGI

• Only Static Contents -> Dynamic Contents
• Web server needs to communicate with Web application

CGI

• Common Gateway Interface
• Interface between web server (Apach, Nginx, etc) and web application (PHP, Node.js, Python, etc)

Weakness of CGI

• Generate new processes at each requests
• Hard to set distribution system

FastCGI

• A permanent process handles requests.
• Separate web server and web application to change network protocol like as TCP. → Easy to set distributed system
• No-dependency on programming languages or platforms

SCGI

• Simple Common Gateway Interface
• Similar as FastCGI

WSGI

• Web Server Gateway Interface
• Popular implementation: uWSGI