Apache vs Nginx: Web Server Comparison

Apache uses a process/thread-based MPM architecture while Nginx uses event-driven asynchronous I/O — two web servers optimized for different traffic patterns and configuration styles.

At a Glance

Key Differences

• Architecture: Apache creates a new process or thread for each connection — with MPM prefork (process), worker (threaded), or event (hybrid). Under thousands of concurrent connections, this consumes significant RAM. Nginx uses an event-driven, asynchronous architecture — a single worker process handles thousands of connections using non-blocking I/O, with much lower memory usage.
• Dynamic content: Apache can embed an interpreter (like mod_php) directly in the server process, which is simpler to configure. Nginx cannot execute dynamic code — it proxies requests to external processors like PHP-FPM, uWSGI, or a Node.js app. This separation is more secure and scalable but requires more configuration.
• Configuration model: Apache supports per-directory configuration via .htaccess files — developers can override settings without server restart. Nginx has no equivalent; all configuration is centralized in /etc/nginx/. Adding a new site requires editing the config file and reloading. .htaccess is convenient but forces Apache to scan every directory in the path for each request, hurting performance.
• Performance under load: Nginx consistently outperforms Apache under high concurrent connections. Apache’s process-per-connection model hits memory limits quickly — a server with 10,000 concurrent connections needs 10,000 processes/threads. Nginx handles 10,000 connections in a few worker processes using minimal memory.
• TLS/SSL performance: Nginx has better TLS performance due to its async architecture and built-in optimizations like OCSP stapling, session tickets, and modern cipher support. Apache’s TLS is adequate but consumes more resources per connection.

When to Choose Apache

Apache is the right choice if you need per-directory configuration control via .htaccess — common in shared hosting environments and CMS platforms like WordPress. If your application relies on .htaccess rewrite rules, Apache is the simplest setup. Apache’s mod_php is easier for PHP applications where you don’t want to configure PHP-FPM separately. Apache’s wide module ecosystem (mod_rewrite, mod_security, mod_proxy) is well-documented and battle-tested.

Use Apache for: shared hosting, WordPress and other CMS platforms, environments requiring .htaccess, teams comfortable with Apache’s configuration style, and legacy applications already running on Apache.

When to Choose Nginx

Nginx is the best choice for high-traffic websites, reverse proxying, and serving static files. Its event-driven architecture handles tens of thousands of concurrent connections with minimal memory — critical for high-traffic production servers. Nginx excels as a reverse proxy in front of application servers (Node.js, Python, Ruby). Its load balancing, caching, and TLS termination features are superior to Apache’s. Most modern tech stacks use Nginx as the front-end server with Apache or application servers behind it.

Use Nginx for: high-traffic websites, microservices API gateways, static file serving, reverse proxy and load balancing, TLS termination, CDN origins, and modern PHP stacks with PHP-FPM.

Side by Side Code Example: Serve a PHP Application

Apache (httpd.conf or .htaccess)

<VirtualHost *:80>
    ServerName example.com
    DocumentRoot /var/www/html

    <Directory /var/www/html>
        AllowOverride All
        Require all granted
    </Directory>

    # PHP handled by mod_php inside Apache
    <FilesMatch \.php$>
        SetHandler application/x-httpd-php
    </FilesMatch>

    ErrorLog /var/log/apache2/error.log
    CustomLog /var/log/apache2/access.log combined
</VirtualHost>

# Apache handles PHP directly with mod_php
# Each request to index.php runs in the Apache process
systemctl reload apache2

Nginx (nginx.conf)

server {
    listen 80;
    server_name example.com;
    root /var/www/html;

    # Static files served directly by Nginx
    location / {
        try_files $uri $uri/ /index.php?$args;
    }

    # PHP requests proxied to PHP-FPM
    location ~ \.php$ {
        fastcgi_pass unix:/var/run/php/php8.3-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }

    # Static assets with caching headers
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg)$ {
        expires 30d;
        add_header Cache-Control "public, no-transform";
    }
}

# Nginx proxies PHP to external PHP-FPM process
# Static files (CSS, JS, images) served directly — no PHP involved
systemctl reload nginx && systemctl reload php8.3-fpm

Expected Output

# Apache: index.php request → mod_php processes inside Apache process
# Nginx:  index.php request → Nginx proxies to PHP-FPM via Unix socket
# Both serve the same PHP application identically to the user

FAQ

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