Apache HTTP Server (httpd)

.htaccess

When to Use

• Shared Hosting:

  .htaccess

  allows per-directory config without restarting the server.
• Dynamic Modules: Loading modules without recompiling.
• Legacy Apps: Many PHP/Perl apps are pre-tuned for Apache.

Core Concepts

MPM (Multi-Processing Modules)

• prefork

  : Compatible with non-thread-safe libraries (old PHP).

• event

  : Modern, async I/O. Best for high concurrency.

VirtualHosts

.htaccess

Best Practices (2025)

• Use

  event

  MPM: It rivals Nginx in connection handling.
• Disable

  .htaccess

  : If you have root access, put config in

  httpd.conf

  Directory

  blocks for performance.
• Use HTTP/2: Enable

  mod_http2

  .

• Don't enable unnecessary modules: Reduce attack surface.

References

• Apache HTTP Server Documentation