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litespeed_wiki:faq:server-apis-available-for-third-party-products
What Server APIs Are Available for Third Party Products?
LiteSpeed Web Server supports a number of SAPIs for communication with external applications: CGI, FastCGI, HTTP, AJP 1.3 (Apache JServ Protocol), and, the most optimized of them all, LiteSpeed Server API (LSAPI).