Apache HTTP Server vs Nginx vs Tomcat: Key Differences and When to Use Each

Apache HTTP Server and Nginx are open‑source HTTP server programs that run on a server, bind an IP address, listen on a TCP port, and return requested resources such as HTML pages or PDFs to browsers.

Java also provides a simple HttpServer class that can be used to start a lightweight HTTP server by binding an IP address and listening on a port.

Tomcat runs on the JVM and, unlike the pure HTTP servers, can dynamically generate resources. It manages the lifecycle of Servlet programs, maps URLs to specific Servlets, creates HttpServletRequest and HttpServletResponse objects, and returns the generated content to the client.

Both Apache HTTP Server and Nginx serve only static resources —the same file content is returned for every request. Dynamic resources, on the other hand, produce different output depending on the request time or client.

Apache and Nginx can be extended with modules (e.g., PHP, Python scripts) to produce dynamic pages, but using Java for dynamic content is cumbersome without a servlet container. Java Servlet and JSP technologies enable Java programs to handle HTTP requests and generate dynamic responses, and Tomcat is the container that supports these technologies.

In practice, Tomcat is often placed behind Nginx:

Static‑dynamic separation : Nginx acts as a reverse proxy, serving static files (images, CSS, JS) directly, while forwarding all dynamic requests to Tomcat.

Load balancing : When traffic grows, multiple Tomcat instances can be launched horizontally; Nginx distributes incoming requests among them.