Apache HTTP Server

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Open-source web server software

The Apache HTTP Server, colloquially called Apache, is a free and open-source web server software developed and maintained by the Apache Software Foundation. It is one of the most popular web servers in use today, serving a significant portion of all active websites on the internet.

History

The Apache HTTP Server was first released in 1995, based on the NCSA HTTPd server. The project was started by Robert McCool and a group of other developers who wanted to create a robust, commercial-grade, and freely available source code implementation of an HTTP (web) server. The name "Apache" was chosen out of respect for the Native American Apache tribe, known for their resilience and endurance.

Features

Apache HTTP Server offers a wide range of features, many implemented as compiled modules which extend the core functionality. These include:

• URL redirection
• Authentication
• SSL/TLS support
• Virtual hosting
• Load balancing
• Server-side scripting support via modules such as mod_perl, mod_php, and mod_python
• Logging and custom error messages

Architecture

Apache HTTP Server follows a modular architecture, allowing administrators to choose which features to enable and to extend the server's capabilities through additional modules. The core of the server is relatively small and lightweight, with most functionality provided by modules.

Multi-Processing Modules (MPMs)

Apache supports several Multi-Processing Modules (MPMs) that determine how client requests are handled. The most commonly used MPMs are:

• Prefork: A non-threaded, pre-forking web server that handles requests using multiple child processes.
• Worker: A hybrid multi-threaded multi-process web server.
• Event: Similar to Worker but optimized for handling keep-alive connections.

Configuration

Apache HTTP Server is configured primarily through text files. The main configuration file is typically called `httpd.conf`, and additional configuration files can be included using the `Include` directive. Configuration directives are used to set various parameters and control the behavior of the server.

Security

Security is a critical aspect of the Apache HTTP Server. It supports various authentication mechanisms, access control methods, and encryption protocols. Regular updates and patches are released to address vulnerabilities and improve security.

Usage

Apache HTTP Server is used by a wide range of organizations, from small businesses to large enterprises. It is known for its flexibility, performance, and wide support for different operating systems and platforms.

See also

• Nginx
• Lighttpd
• Web server
• Apache Software Foundation
• HTTP
• HTTPS
• Server (computing)

Related pages

• List of web servers
• Comparison of web server software
• Apache License
• Open-source software

External links

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