Apache HTTP Server

Apache HTTP Server, often just Apache or httpd, is an open-source web server maintained by the Apache Software Foundation. It serves static files and passes dynamic requests to application code through modules or proxies, and it has been used on a very large share of websites for many years.

Why it matters

Apache is common on shared hosting and in LAMP stacks, and many control panels assume it. Its module system adds features such as mod_rewrite for URL rewriting, mod_ssl for HTTPS and mod_headers for custom headers. It supports per-directory .htaccess files, letting users change settings without server access, at a small performance cost because files are checked on each request. Several processing models exist, including prefork, worker and event.

Example

<VirtualHost *:80>
    ServerName example.com
    DocumentRoot /var/www/example
    RewriteEngine On
    RewriteRule ^/old$ /new [R=301,L]
</VirtualHost>

Check syntax with apachectl configtest before reloading.

Common mistakes

• Setting AllowOverride None and wondering why .htaccess rules are ignored.
• Running too many prefork workers and exhausting memory under load.
• Leaving directory listing enabled with Options Indexes.

Related

• Web server
• Nginx
• LAMP stack
• गाइड: Apache vs Nginx troubleshooting

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