**Ruby** is a general-purpose language used to create web applications, as it has development frameworks already installed.

With Ruby, we can implement client-server models to send requests through #key# socket programming: a way of connecting two devices on a network to communicate with each other #key#.

The Ruby language supports libraries that give high-level access to application-level specified networking protocols, such as File Transfer Protocol (FTP), HyperText Transfer Protocol (HTTP), Transmission Control Protocol (TCP), and more.

## Server model in ruby
### The `TCPServer` class

If we want to design a server connection, we'll have to use the `TCPServer` class in Ruby.

The **`TCPServer` class** supports multiple attributes necessary for building a server-client relationship in Ruby. A `TCPServer` class object works as a factory for sockets.

## Syntax

To run a Ruby server program, we have to integrate the `TCPServer` class. 

Since we have to connect to a server, we need a `hostname`, `port`, and `socket` package to include some commands.



## Code

Let's implement a server request using the `TCPServer` class.

require 'socket'

server  = TCPServer.new('localhost', 3306) 

loop do
  request = server.accept
  request.puts 'simple server request in ruby'
  request.close
end


### Explanation

The above program demonstrates a simple server connection. Line 1 (`require 'socket'`) includes the libraries and attributes necessary for a `TCPServer` connection.

The `TCPServer.new(...)` accepts two parameters in this case: `localhost` and a port number `3306`. This method creates a new server.

The body of loop `do-end` opens a server request, sends a message 'simple server request in ruby,' and closes the server request using `request.close`.

How to build a simple server in Ruby

Server model in ruby

The TCPServer class

Syntax

Code

Explanation

The `TCPServer` class