Web Server

A web server is software that listens for HTTP and HTTPS requests and responds with content. Nginx, Apache and Caddy are common examples, and the term also describes the computer that runs them.

Why it matters

The web server is the front door of your site. It serves static files, passes dynamic requests to an application (PHP, Node.js, Python), terminates TLS and writes access logs. When it is overloaded, misconfigured or down, visitors see errors such as 500, 502 or 503.

Example

Browser  ->  GET /index.html  ->  Nginx
Browser  <-  200 OK + HTML     <-  Nginx

For a request like /api/orders, Nginx may instead forward the request to an app server and relay its answer back.

Common mistakes

• Treating the web server and the hosting provider as the same thing.
• Leaving default pages, directory listings or version banners enabled in production.
• Not monitoring it from outside, so you learn about outages from customers.

Related

• Reverse proxy
• Web hosting
• HTTP
• HTTP status code
• टूल: Website hosting checker

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