Ruby simple web-server with webrick

gistfile1.rb

require 'webrick'

config = {
    'port' => 3002
}

server = WEBrick::HTTPServer.new({:Port => config['port']})
     
server.mount_proc '/' do |request, response|
        
    filename = request.path.sub! '/', ''

    if File.exist?(request.path)
        result = File.read(request.path)
    else
        result = 'Custom error page content'
    end

    response.body = result

end

trap("INT") {
    server.shutdown
}
     
server.start