Web Server
A web server is software or hardware that receives requests from users’ browsers and delivers web pages, files, data, and other website resources to them. It is the web server that provides access to a website on the internet and is responsible for processing HTTP/HTTPS requests.
What is a Web Server?
A web server can be:
- Software installed on a computer or server (e.g., Apache, Nginx).
- Physical hardware where website files and application logic are hosted.
It receives requests from clients (browsers, applications, bots), processes them, and sends the requested content: HTML pages, stylesheets, scripts, images, API data.
How a Web Server Works
- A user enters a website address (URL).
- The browser sends a request to the server using the HTTP or HTTPS protocol.
- The web server receives the request and determines which resource to deliver.
- If the requested file is found, the server sends it to the browser.
- If the file requires processing (e.g., PHP), the server passes the request to an interpreter or application.
- The browser displays the received data as a website page.
Core Functions of a Web Server
- Processing HTTP/HTTPS Requests: Delivering pages, files, and data.
- Storing and Serving Content: HTML, CSS, JS, media files, API responses.
- Running Dynamic Applications: Extensions, modules, server-side scripts (PHP, Node.js, Python).
- Load Management: Balancing requests, caching, distributing traffic.
- Security: Supporting SSL certificates, protecting against malicious requests.
- Logging: Maintaining request logs for analysis and diagnostics.
Types of Web Servers
- Apache: Very popular, flexible, with a large number of modules.
- Nginx: Very fast, lightweight, excellent at handling high loads.
- LiteSpeed: A commercial server with high performance.
- IIS (Internet Information Services): Microsoft’s server for Windows.
- Node.js (as a server): Allows creating server-side logic with JavaScript.
Where Web Servers Are Used
- Websites and online stores.
- SaaS applications.
- API services.
- Corporate portals.
- Mobile application backends.
- CDN (Content Delivery Network) setups.
- Cloud platforms.
Why Web Servers are Important
- Impact website loading speed.
- Determine project stability and uptime.
- Ensure security.
- Affect SEO (speed, availability, correct server responses).
- Support high traffic during advertising campaigns.
Example
A user visits example.com. Nginx receives the request → passes it to PHP-FPM → receives the generated page → sends it to the browser → the browser displays the finished website.
Conclusion
A web server is a key component in the operation of any website. It receives user requests and delivers the required data, ensuring stable, fast, and secure operation of web resources.
