```ruby
# http://mongrel.rubyforge.org/rdoc/index.html
# gem install -y mongrel
require 'rubygems'
require 'mongrel'
# Usage: ruby mongrel_http_server.rb
host = ARGV[0] || "127.0.0.1"
port = ARGV[1] || 80
docroot = ARGV[2] || "html/"
# Simple Mongrel handler that prints the current date and time
class HandlerExample < Mongrel::HttpHandler
def process(request, response)
response.start(200) do |head, out|
head["Content-Type"] = "text/html"
out.write Time.now
end
end
end
# Configure Mongrel and handlers
config = Mongrel::Configurator.new :host => host, :port => port do
listener do
uri "/", :handler => Mongrel::DirHandler.new(docroot)
uri "/handler_example", :handler => HandlerExample.new, :in_front => true
end
# CTRL+C to stop server
trap("INT") { stop }
run
end
# Start Mongrel
puts "Mongrel listening on '#{host}:#{port}', serving documents from '#{docroot}'."
config.join
```