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我在Heroku上託管的生產中有一個Rails 5應用程序。我最近注意到服務器上的負載特別高，並且在進一步的調查中，它看起來好像都來自一組垃圾郵件機器人。防止垃圾郵件機器人撞到Rails應用程序
這些漫遊器正在播放「我發給朋友的電子郵件」表單，這些表單是我在展示頁面上提供給註銷用戶的。自那時以來，我的表單只能用於登錄和認證用戶。我還刪除了機器人在數據庫中的具體記錄，但這並沒有做任何事情來阻止機器人擊中路線。 （他們似乎只是針對特定的記錄...）
然後我安裝了rack-attack gem試圖阻止對這個特定路由的請求（以及sign_up路徑），但是我遇到的問題是這些垃圾郵件請求源於每次不同的IP地址，機架攻擊寶石只會抑制來自單個IP的請求。
任何人都可以提供任何幫助如何防止這些機器人點擊我的網站？
這裏是Heroku的日誌打印出來：
2016-11-26T08:01:22.784341+00:00 heroku[router]: at=info method=POST path="/jobs/389-commercial-vehicle-technician-northside-truck-van-york-mercedes-benz-uk-ltd/email_to_friend" host=www.example.com request_id=02689424-de9c-4a25-96c8-8f510a587836 fwd="203.160.52.159" dyno=web.1 connect=1ms service=11ms status=404 bytes=1812
2016-11-26T08:01:22.757585+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] Started POST "/jobs/389-commercial-vehicle-technician-northside-truck-van-york-mercedes-benz-uk-ltd/email_to_friend" for 203.160.52.159 at 2016-11-26 08:01:22 +0000
2016-11-26T08:01:22.759320+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836]
2016-11-26T08:01:22.759371+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] ActionController::RoutingError (No route matches [POST] "/jobs/389-commercial-vehicle-technician-northside-truck-van-york-mercedes-benz-uk-ltd/email_to_friend"):
2016-11-26T08:01:22.759421+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836]
2016-11-26T08:01:22.759493+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/debug_exceptions.rb:53:in `call'
2016-11-26T08:01:22.759535+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
2016-11-26T08:01:22.759575+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/railties-5.0.0.1/lib/rails/rack/logger.rb:36:in `call_app'
2016-11-26T08:01:22.759639+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/railties-5.0.0.1/lib/rails/rack/logger.rb:24:in `block in call'
2016-11-26T08:01:22.759726+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.0.1/lib/active_support/tagged_logging.rb:26:in `tagged'
2016-11-26T08:01:22.759685+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.0.1/lib/active_support/tagged_logging.rb:70:in `block in tagged'
2016-11-26T08:01:22.759766+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.0.1/lib/active_support/tagged_logging.rb:70:in `tagged'
2016-11-26T08:01:22.759905+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/railties-5.0.0.1/lib/rails/rack/logger.rb:24:in `call'
2016-11-26T08:01:22.759944+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/request_id.rb:24:in `call'
2016-11-26T08:01:22.760009+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/rack-2.0.1/lib/rack/method_override.rb:22:in `call'
2016-11-26T08:01:22.760265+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/rack-2.0.1/lib/rack/runtime.rb:22:in `call'
2016-11-26T08:01:22.760333+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.0.1/lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
2016-11-26T08:01:22.760365+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/executor.rb:12:in `call'
2016-11-26T08:01:22.760394+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/static.rb:136:in `call'
2016-11-26T08:01:22.760422+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/bundler/gems/heroku-deflater-60d92ba0f8ae/lib/heroku-deflater/skip_binary.rb:19:in `call'
2016-11-26T08:01:22.760478+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/rack-2.0.1/lib/rack/deflater.rb:35:in `call'
2016-11-26T08:01:22.760522+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/bundler/gems/heroku-deflater-60d92ba0f8ae/lib/heroku-deflater/serve_zipped_assets.rb:50:in `call'
2016-11-26T08:01:22.760552+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/rack-2.0.1/lib/rack/sendfile.rb:111:in `call'
2016-11-26T08:01:22.760581+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/ssl.rb:83:in `call'
2016-11-26T08:01:22.760610+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/railties-5.0.0.1/lib/rails/engine.rb:522:in `call'
2016-11-26T08:01:22.760650+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/puma-3.6.0/lib/puma/configuration.rb:225:in `call'
2016-11-26T08:01:22.760699+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/puma-3.6.0/lib/puma/server.rb:578:in `handle_request'
2016-11-26T08:01:22.760741+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/puma-3.6.0/lib/puma/server.rb:415:in `process_client'
2016-11-26T08:01:22.760782+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/puma-3.6.0/lib/puma/server.rb:275:in `block in run'
2016-11-26T08:01:22.760849+00:00 app[web.1]: [02689424-de9c-4a25-96c8-8f510a587836] vendor/bundle/ruby/2.3.0/gems/puma-3.6.0/lib/puma/thread_pool.rb:116:in `block in spawn_thread'