A web server is a software application that runs on a computer and is responsible for serving web content, such as HTML pages, to clients over the internet. When a user enters a web address into their web browser, the browser sends a request to the web server, which then responds by sending the requested web page back to the browser. The web server can also handle requests for other types of content, such as images, videos, and audio files.

These servers are designed to handle different workloads and can be customized with a variety of features and plugins to meet the specific needs of a website. Web servers are an essential part of the infrastructure of the internet and play a crucial role in making websites and web-based applications available to users around the world.

There are 5 Types of Web Servers:

• Apache
• Nginx
• Microsoft IIS
• Lighttpd
• Jigsaw

Different types of web servers are :

1. Apache :

Apache is the most popular and widely used web server in the world. It is an open-source software that is developed and maintained by the Apache Foundation. Apache is known for its reliability, flexibility, and performance, making it a popular choice for hosting websites of all sizes. It is also highly customizable, with a wide range of modules and plugins available to extend its functionality.

In addition to serving static web content, such as HTML pages and images, Apache can also be used to host dynamic content, such as websites built with server-side scripting languages like PHP. It can also be used as a reverse proxy server, which forwards requests from the internet to one or more backend servers.

Apache is highly configurable and can be fine-tuned to meet the specific needs of a website or web application. It is also known for its reliability and performance, making it a popular choice for many large and high-traffic websites.

2. Nginx :

Nginx is another popular open-source web server that is known for its high performance and low resource usage. It is often used as a reverse proxy server, routing traffic to other servers and services, and can also be used to cache static content for faster delivery to users. Nginx is widely used to host high traffic websites, and is often used in combination with Apache to balance the load between the two servers.

One of the key features of Nginx is its ability to handle a large number of concurrent connections efficiently. It uses an event-driven architecture and can handle requests asynchronously, which makes it well-suited for handling high traffic volumes.

In addition to serving static web content, Nginx can also be used to host dynamic content, such as websites built with server-side scripting languages like PHP. It can also be configured as a reverse proxy server, which forwards requests from the internet to one or more backend servers.

3. Microsoft IIS :

Microsoft IIS (Internet Information Services) is a proprietary web server developed by Microsoft for use with the Windows operating system. It is a powerful and feature-rich web server, with support for a wide range of web technologies and protocols. IIS is often used in enterprise environments, and is integrated with other Microsoft products such as Active Directory and Exchange.

IIS is a flexible and extensible web server that can be used to host a wide range of content, including static web pages, dynamic web pages, and web-based applications. It supports a variety of programming languages, including ASP.NET, PHP, and Python, and can be configured with a variety of modules and extensions to add new features and functionality.

IIS is known for its reliability and performance, and it is widely used by large and small organizations around the world. It is also well-integrated with other Microsoft products, such as the .NET framework, making it a popular choice for developers building web-based applications on the Windows platform.

4. Lighttpd :

Lighttpd is a free and open-source web server designed to be lightweight, fast, and efficient. It is written in C and has a low memory footprint, making it a good choice for hosting high-traffic websites on low-resource servers.

One of the key features of Lighttpd is its modular design, which allows users to easily customize and extend the server's functionality. It supports a wide range of features including FastCGI, URL rewriting, and server-side scripting languages like PHP and Ruby. It also has built-in support for SSL/TLS and can be configured to work with external authentication modules.

Lighttpd is known for its security features. It supports chroot jailing, which isolates the server from the rest of the system, and can be configured to use access controls to prevent unauthorized access to certain areas of the server.

5. Jigsaw :

Jigsaw is a web server that was developed by the World Wide Web Consortium (W3C) as a reference implementation of the HTTP/1.1 protocol. Jigsaw remains a popular choice for developers who are interested in learning about web server technology and HTTP protocols.

One of the key features of Jigsaw is its modular design, which allows users to easily customize and extend the server's functionality. It supports a wide range of features including CGI, server-side scripting languages like PHP and Python, and SSL/TLS encryption. It also has built-in support for virtual hosting, which allows a single server to host multiple websites.

Jigsaw is available for most operating systems, including Linux, macOS, and Windows. It is a good choice for developers who are interested in learning about web server technology and HTTP protocols, but may not be suitable for use in production environments due to its lack of active development and support.

How to Choose the best web server for you ?

1. The first step in using a web server is to choose the right one for your needs. There are several different types of web servers available, each with its own unique features and capabilities. Some popular web servers include Apache, Nginx, Microsoft IIS, and Apache Tomcat. Consider factors such as the type of content you are hosting, the level of performance and scalability you require, and your budget when choosing a web server.

2. Install and configure the web server :

Once you have chosen a web server, the next step is to install and configure it on your computer or server. This process will vary depending on the web server you are using, but generally involves downloading the software, running the installation program, and configuring the server settings to meet your needs.

3. Create and publish web content :

After the web server is installed and configured, the next step is to create and publish your web content. This can include HTML pages, images, videos, and other types of media. To publish your content, you will need to transfer it to the web server using a process called "uploading." This can typically be done using a file transfer protocol (FTP) client or a web-based control panel provided by the web server.

4. Test and debug your web content :

Once your web content is published to the web server, the next step is to test and debug it to ensure it is functioning as intended. This can involve viewing the content in a web browser, running automated tests, and fixing any errors or issues that arise.

5. Monitor and maintain the web server :

Finally, it is important to monitor and maintain your web server to ensure it is running smoothly and efficiently. This can involve tasks such as checking logs, updating software, and troubleshooting any issues that arise.

It is important to ensure the security of the web servers we are using.
This is typically accomplished using Secure Sockets Layer (SSL) or Transport Layer Security (TLS) protocols, which establish a secure connection between the server and the browser and encrypt the data transmitted between them.

Encrypting the communication between a web server and a web browser is important for a number of reasons :

1. It helps to protect the confidentiality of the data transmitted between the server and the browser, such as login credentials, financial information, and personal data.

2. It also helps to ensure the integrity of the data, as the encrypted data cannot be modified or tampered with during transmission.

The different types of web server security are :

1. SSL/TLS encryption :

SSL (Secure Sockets Layer) and TLS (Transport Layer Security) are protocols that encrypt data transmitted between a web server and a client. This is especially important when sensitive information, such as login credentials or financial data, is being transmitted. Web servers typically support SSL/TLS encryption to help ensure the security and confidentiality of data transmitted over the internet.

2. Firewalls :

Firewalls are a key security feature of web servers, designed to protect against unauthorized access and malicious attacks. A firewall is a software or hardware component that monitors incoming and outgoing network traffic and blocks or allows certain types of traffic based on predetermined security rules. Web servers often include built-in firewalls or can be configured to use external firewalls to provide an additional layer of protection.

3. Access controls :

Access controls are security measures that restrict access to certain areas of a web server or web application. This can include measures such as user authentication, which requires users to provide login credentials to access certain areas of a website, and permissions, which control what actions users are allowed to perform on the server. Web servers typically include access controls to help ensure that only authorized users have access to sensitive areas of a website or application.

4. Secure file transfer protocols :
   Secure file transfer protocols (SFTP) are a type of network protocol that allows for the secure transfer of files between a client and a server. They are commonly used to transfer web content between a local computer and a web server. Web servers typically support SFTP to help ensure the security and integrity of data transferred over the internet.

5. Regular updates and patches :
   Web servers are constantly evolving and improving, and it is important to keep them up to date with the latest security patches and updates. These updates often include fixes for security vulnerabilities and other bugs, and it is important to install them as soon as they are available to help protect against potential threats.

What are protocols in web server communication ?

Protocols are used in web servers to establish rules and standards for how the server should communicate with clients (such as web browsers) and other servers over the internet. Protocols define the format and structure of the data transmitted between the server and the client, as well as the rules for establishing and maintaining a connection.

When a user types a web address into their browser, the browser sends a request to the web server to retrieve the website and display it to the user.

There are several protocols that are involved in this process, including the following:

1. HTTP (Hypertext Transfer Protocol): This is the most common protocol used for transferring web content between a server and a client. It defines how messages are formatted and transmitted, and what actions web servers and clients should take in response to various commands.

2. HTTPS (Hypertext Transfer Protocol Secure): This is an extension of HTTP that adds an extra layer of security by encrypting the data being transmitted between the server and the client. This is important for protecting sensitive information, such as passwords and credit card numbers.

3. FTP (File Transfer Protocol): This protocol is used for transferring files between a client and a server. It is often used to upload and download files from web servers, such as images, documents, and other types of media.

4. SMTP (Simple Mail Transfer Protocol): This protocol is used for sending and receiving email messages. When you send an email from your computer, it is transmitted to an SMTP server, which then delivers it to the recipient's email server.

What is the difference between Web Servers and Email servers ?

Web servers and Email servers are typically dedicated servers that are optimized for their specific tasks. Web servers are designed to handle a large number of incoming HTTP requests simultaneously, while mail servers are designed to handle the sending and receiving of large volumes of email messages.

The differences are :

1. Protocols: Web servers use the HTTP (Hypertext Transfer Protocol) to communicate with clients, while Email servers use the SMTP (Simple Mail Transfer Protocol) for sending messages and the POP3 (Post Office Protocol version 3) or IMAP (Internet Message Access Protocol) for receiving messages.

2. Port numbers: Web servers typically listen on port 80 for HTTP traffic and port 443 for HTTPS traffic, while Email servers typically listen on port 25 for SMTP traffic, port 110 for POP3 traffic, and port 143 for IMAP traffic.

3. Content: Web servers return HTML pages, images, and other types of content to clients, while mail servers store and transmit email messages.

4. Security: Web servers are typically configured to use SSL/TLS encryption to secure HTTP traffic, while Email servers may use SSL/TLS or other encryption methods to secure email messages.

5. Performance: Web servers are optimized for handling a large number of incoming HTTP requests simultaneously, while Email servers are optimized for handling the sending and receiving of large volumes of email messages.

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Hence, web servers are an integral part of the internet and play a vital role in making websites and web-based applications available to users. They are highly configurable and can be fine-tuned to meet the specific needs of a website or web application, making them an important tool for businesses and organizations of all sizes.

With this article at OpenGenus, you must have the complete idea of different types of Web Servers.