The Apache HTTP Server, colloquially called Apache, is free and open-source cross-platform web server.
https://httpd.apache.org/
Allow full access to the Apache subdirectory
Apache Tuning Tips
Authentication
Certificates
Configure
Create a maintenance page
Download Apache directory listings recursively
Get the originating host ip
Harden Apache
Install Apache
Logs
Modules
Prevent Apache Killer
Redirect HTTP to HTTPS
Restart Apache
Rewrite Rule for root Directory
Setting up HSTS in Apache
SSL
Status
Troubleshooting
Virtual Hosts
Virtual host debug
https://help.ubuntu.com/lts/serverguide/httpd.html