Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing, Persistence Apache HTTP Server 1.3 – KeepAliveTimeout Directive Apache HTTP Server 2.0 – KeepAliveTimeout Directive Apache HTTP Server 2.2 – KeepAliveTimeout Directive Apache HTTP Server 2.4 – KeepAliveTimeout Directive Multiple (wiki).
Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing, Persistence Apache HTTP Server 1.3 — KeepAliveTimeout Directive Apache HTTP Server 2.0 — KeepAliveTimeout Directive Apache HTTP Server 2.2 — KeepAliveTimeout Directive Apache HTTP Server 2.4 — KeepAliveTimeout Directive Multiple (wiki).