My first ruby script. Is a webserver where you pass the URL like localhost:8080/http://google.com and it'll tell you if google is up and what response given etc. It's terrible but it's a start.

isup.rb

#!/usr/bin/ruby

#require "net/http"
require "net/https"
require "uri"
require "socket"
require "yaml"

$redirects = Array.new

def fetch(uri_str, limit = 10)
  raise ArgumentError, 'too many HTTP redirects' if limit == 0
  response = Net::HTTP.get_response(URI(uri_str))
  case response
  when Net::HTTPSuccess then
    response
  when Net::HTTPRedirection then
    location = response['location']
    #warn "redirected to #{location}"
    $redirects << location
    fetch(location, limit - 1)
  else
    response.value
  end
end

webserver = TCPServer.new('0.0.0.0', 8080)
while (session = webserver.accept)
  while line = session.gets
		md = line.match(/^GET\s\/(\S+)\s/)
		if !md.nil? && md[1] =~ /^#{URI::regexp}$/
			puts md[1]
			puts 'cows'
			result = fetch(md[1])
			output = {
				'isup_status' => 'success',
				'uri' => md[1],
				'code' => result.code,
				'status' => result.message,
				'redirects' => $redirects,
			}
			session.write(YAML.dump(output))
			$redirects.clear
			break
    	else
			output = {
				'isup_status' => 'error',
			}
			session.write(YAML.dump(output))
    		break
    	end
	end
    session.close
end