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

Example configuration file

Extract all user agents from Apache logs

Get the originating host ip

Harden Apache

Hide web server version from appearing in http header

Install Apache

Modules

Prevent Apache Killer

Redirect HTTP to HTTPS

Restart Apache

Restrict Apache Information Leakage

Rewrite Rule for root Directory

Setting up HSTS in Apache

SSL

Troubleshooting

Use .htaccess to hard-block spiders and crawlers

Use password protected certificates

Virtual Hosts

Virtual host debug

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