post '/register' do
   #send post request to http://www.randomsite.com
   #parse response
   #do something with it
   @user = User.first(:name => params['regUsername'])
   if @user == nil
     @user = User.create(
     :name         => params['regUsername'],:pass         => Password.create(params['regPassword']),:email        => params['regEmail'],:created_date => Time.now
     )
     redirect '/'
   else
     "User already exists."
   end
end

如何从Ruby代码中向另一个网站发送另一个POST请求？