Apache HTTP Server
The Apache HTTP Server (unofficially, but commonly, known as Apache; hereinafter, the Software) is the most popular webserver software. As of February of 2019, the Software was used by more than 44% of all the websites in the World Wide Web (WWW). The second popular webserver, Nginx, was used by about 41% at that time. The Software is both open-source cross-platform.
Binding to Addresses and Ports Configuration Files Configuration Sections Content Caching Content Negotiation Dynamic Shared Objects (DSO) Environment Variables Log Files Mapping URLs to the Filesystem Performance Tuning Security Tips Server-Wide Configuration SSL/TLS Encryption Suexec Execution for CGI URL Rewriting with mod_rewrite Virtual Hosts