Apache is used by 17.11% of sites

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The Apache HTTP Server, commonly known as Apache, is a free and open-source web server software that powers a significant portion of the world's websites. It was initially developed in 1995 by the Apache Software Foundation and has since become one of the most popular and widely used web servers.

Apache is cross-platform, meaning it can run on various operating systems such as Windows, Linux, macOS, and more. It provides a reliable and efficient platform for delivering web content, handling HTTP requests, and serving web pages to clients (web browsers) over the internet.

Key features and functionalities of Apache include:

HTTP Protocol Support: Apache supports the Hypertext Transfer Protocol (HTTP) and its secure counterpart, HTTPS (HTTP over SSL/TLS). It can handle various HTTP methods like GET, POST, PUT, DELETE, and more.

Virtual Hosting: Apache allows hosting multiple websites (virtual hosts) on a single server by mapping different domain names or IP addresses to specific directories or configurations.

URL Rewriting: Apache provides a powerful module called mod_rewrite, which enables rewriting and manipulation of URLs. It allows developers to create user-friendly and search engine-friendly URLs, perform redirections, and implement complex URL-based routing.

Authentication and Access Control: Apache offers authentication mechanisms, including Basic, Digest, and LDAP authentication, to control access to web resources. It allows administrators to restrict access to specific directories, files, or entire websites.

Logging and Error Handling: Apache generates detailed log files that record information about incoming requests, server errors, and other relevant events. These logs are useful for monitoring, debugging, and analyzing web server activity.

Module Extensibility: Apache is highly modular, and it supports a wide range of modules that extend its functionality. These modules can add support for scripting languages, database connectivity, content caching, proxying, compression, security enhancements, and more.

Performance and Scalability: Apache is known for its stability, performance, and scalability. It can handle a large number of concurrent connections efficiently and provides configuration options to optimize resource usage and enhance server performance.

Apache's popularity and wide adoption have led to a rich ecosystem of community support, documentation, and third-party tools. It remains a popular choice for hosting websites, powering content management systems (CMS), and serving web applications.