Serg server

index.cgi

#!/usr/bin/env ruby

require 'cgi'

# Refresh period
PERIOD = 1   # seconds

# Calculate random value from 1 to 10
value = rand(10) + 1

# Create CGI object
cgi = CGI.new('html4')

# Build HTML ouput with CGI DSL.
cgi.out do
  cgi.head do
    cgi.meta('http-equiv' => 'refresh', 'content' => PERIOD.to_s)
  end +
  cgi.html do
    cgi.body do
      cgi.p { "value = #{value}" }
    end
  end
end

server.rb

require 'webrick'

# Current directory
root = File.dirname(__FILE__)

# Initialize server with port and DocumentRoot dir
server = WEBrick::HTTPServer.new :Port => 8000, :DocumentRoot => root

# Set signal handler to shutdown server when you press Ctrl+C
trap 'INT' do server.shutdown end

# Run server on 8000 port
server.start

• Place those both files in same directory
• Make index.cgi be executable: run chmod +x ./index.cgi
• Start server ruby ./server.rb
• Open browser and visit http://localhost:8000