Working=

require 'net/http'

pages = %w( www.rubycentral.com
        www.awl.com
        www.pragmaticprogrammer.com
        www.mattiaslovkvist.se
        )
threads = []

for page in pages
        threads << Thread.new(page) { |myPage|

                h = Net::HTTP.new(myPage, 80)
                puts "Fetching: #{myPage}"
                resp, data = h.get('/', nil )
                puts "Got #{myPage}: #{resp.message}"
        }
end

threads.each { |aThread| aThread.join }



Not working =

require 'net/http'

pages = %w( www.rubycentral.com
        www.awl.com
        www.pragmaticprogrammer.com
        www.mattiaslovkvist.se
        )
threads = []

pages.each { |page|
        threads << Thread.new(page) { |myPage|

                h = Net::HTTP.new(myPage, 80)
                puts "Fetching: #{myPage}"
                resp, data = h.get('/', nil )
                puts "Got #{myPage}: #{resp.message}"
        }
}

threads.each { |aThread| aThread.join }