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Lesson 4

  1. 1. Lesson 4 WEB SERVER
  2. 2. WEB SERVER A web server is a computer that runs websites. It's a computer program that distributes web pages as they are requisitioned. The basic objective of the web server is to store, process and deliver web pages to the users. This intercommunication is done using Hypertext Transfer Protocol (HTTP). These web pages are mostly static content that includes HTML documents, images, style sheets, test etc. Apart from HTTP, a web server also supports SMTP (Simple Mail transfer Protocol) and FTP (File Transfer Protocol) protocol for emailing and for file transfer and storage.
  3. 3. The main job of a web server is to display the website content. If a web server is not exposed to the public and is used internally, then it is called Intranet Server. When anyone requests for a website by adding the URL or web address on a web browsers (like Chrome or Firefox) address bar (like www.economictimes.com), the browser sends a request to the Internet for viewing the corresponding web page for that address. A Domain Name Server (DNS) converts this URL to an IP Address (For example 192.168.216.345), which in turn points to a Web Server.
  4. 4. The Web Server is requested to present the content website to the user’s browser. All websites on the Internet have a unique identifier in terms of an IP address. This Internet Protocol address is used to communicate between different servers across the Internet. These days, Apache server is the most common web server available in the market. Apache is an open source software that handles almost 70 percent of all websites available today. Most of the web-based applications use Apache as their default Web Server environment. Another web server that is generally available is Internet Information Service (IIS). IIS is owned by Microsoft.
  5. 5. EXAMPLE OF WEB BROWSER  Apache Web Server Apache is currently the most used web server in the world. Founded in 1996, it’s now maintained by the Apache Foundation. Its freeware, and compatible with Linux, Windows, FreeBSD, Mac and several other platforms.
  6. 6.  IIS Also one of the most popular web server examples. IIS belongs to Microsoft. IIS stands for Microsoft Internet Information Services. It comes with the Windows Server operating system. It’s configurable through a graphical interface.
  7. 7.  NGINX It’s one of the most popular web server software. NGINX was developed by Igor Sysoev in 2002. Also, it is not a standalone web server example. NGINX is a different example because it works as a proxy server, together with another web server application like Apache.
  8. 8.  APACHE TOMCAT Tomcat is a free web server, specialized in Java Servlets. In other words, it’s a Java container. Apache Tomcat was initially developed by Sun Microsystems, and then it was transferred to the Apache Software Foundation in 1999. By the way, Tomcat usually works under port 8080 and supports PHP, ASP.net, Perl, Python, etc.
  9. 9.  LIGHTHTTPD Lighthttpd was initially developed in 2003. Basically, it’s not a very common web server software example for public web sites on the internet. It has a big advantage: as the name says, it’s the lighter HTTP server available. It uses a very low memory, CPU and disk space.

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