socket_server.rb

require 'socket'
require 'thread'

s = Socket.new :INET, :STREAM

addr = Socket.pack_sockaddr_in(12345, '127.0.0.1')

s.bind(addr)
s.listen(10)

loop do
  client, addrinfo = s.accept
  Thread.new do
    puts "connected"
    msg = client.recv(3)
    puts "got: #{message}"
  end
end

socket_test.rb

require 'socket'

s = Socket.new :INET, :STREAM

sockaddr = Socket.pack_sockaddr_in(80, 'www.google.com')

s.connect(sockaddr)

s.write("GET /index.html HTTP/1.0\r\n\r\n")

puts s.read