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

Extract all user agents from Apache logs

Get the originating host ip

Harden Apache

Install Apache

Modules

Prevent Apache Killer

Redirect HTTP to HTTPS

Restart Apache

Rewrite Rule for root Directory

Setting up HSTS in Apache

SSL

Troubleshooting

Virtual Hosts

Virtual host debug

https://help.ubuntu.com/lts/serverguide/httpd.html