The Apache HTTP Server is an open-source HTTP server for modern operating systems including UNIX and Windows.

The Apache Reference provides beginners with a simple introduction to the basics, and experts will find advanced details they need.

In this you will see the following things below.

* Reference Manual
- Compiling and Installing
- Starting
- Stopping or Restarting
- Run-time Configuration Directives
- Modules
- Multi-Processing Modules (MPMs)
- Filters
- Handlers
- Expression parser
- Server and Supporting Programs
- Glossary

* Users' Guide
- Getting Started
- 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

* How-To / Tutorials
- Authentication and Authorization
- Access Control
- CGI: Dynamic Content
- .htaccess files
- Server Side Includes (SSI)
- Per-user Web Directories (public_html)
- Reverse proxy setup guide

* Platform Specific Notes
- Microsoft Windows
- RPM-based Systems (Redhat / CentOS / Fedora)
- Novell NetWare
- EBCDIC Port

* Release Notes
- New features with Apache 2.3/2.4
- New features with Apache 2.1/2.2
- New features with Apache 2.0
- Upgrading to 2.4 from 2.2
- Apache License

You will find all this section offline without any internet connection and learn Apache Web Server easily anywhere and anytime.