Apache Reference: mod_info

mod_info - Display Summary of Server Configuration-Time Information
Since Apache 1.1, src/modules/standard/mod_info.c
Rasmus Lerdorf, Lou Langholtz (1996)

mod_info provides a content handler that can be mapped to a URL and that outputs a configuration-time information page when requested. This page includes the compiled-in modules and all configuration directives that are present in the server configuration files.