我正在尝试将 youtube 嵌入添加到字符串（video.link），但它会使我的应用程序崩溃，我正在使用 redCloth 来处理 html 输出。不知道如何处理乘客错误，有人可以帮忙吗？
错误信息：
ActionController::RoutingError (No route matches [GET] "/403.shtml"):
vendor/bundle/ruby/1.8/gems/actionpack-3.2.11/lib/action_dispatch/middleware/debug_exceptions.rb:21:in `call'
vendor/bundle/ruby/1.8/gems/actionpack-3.2.11/lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
vendor/bundle/ruby/1.8/gems/railties-3.2.11/lib/rails/rack/logger.rb:32:in `call_app'
vendor/bundle/ruby/1.8/gems/railties-3.2.11/lib/rails/rack/logger.rb:16:in `call'
vendor/bundle/ruby/1.8/gems/activesupport-3.2.11/lib/active_support/tagged_logging.rb:22:in `tagged'
vendor/bundle/ruby/1.8/gems/railties-3.2.11/lib/rails/rack/logger.rb:16:in `call'
vendor/bundle/ruby/1.8/gems/actionpack-3.2.11/lib/action_dispatch/middleware/request_id.rb:22:in `call'
vendor/bundle/ruby/1.8/gems/rack-1.4.5/lib/rack/methodoverride.rb:21:in `call'
vendor/bundle/ruby/1.8/gems/rack-1.4.5/lib/rack/runtime.rb:17:in `call'
vendor/bundle/ruby/1.8/gems/activesupport-3.2.11/lib/active_support/cache/strategy/local_cache.rb:72:in `call'
vendor/bundle/ruby/1.8/gems/rack-1.4.5/lib/rack/lock.rb:15:in `call'
vendor/bundle/ruby/1.8/gems/rack-cache-1.2/lib/rack/cache/context.rb:136:in `forward'
vendor/bundle/ruby/1.8/gems/rack-cache-1.2/lib/rack/cache/context.rb:245:in `fetch'
vendor/bundle/ruby/1.8/gems/rack-cache-1.2/lib/rack/cache/context.rb:185:in `lookup'
vendor/bundle/ruby/1.8/gems/rack-cache-1.2/lib/rack/cache/context.rb:66:in `call!'
vendor/bundle/ruby/1.8/gems/rack-cache-1.2/lib/rack/cache/context.rb:51:in `call'
vendor/bundle/ruby/1.8/gems/railties-3.2.11/lib/rails/engine.rb:479:in `call'
vendor/bundle/ruby/1.8/gems/railties-3.2.11/lib/rails/application.rb:223:in `call'
vendor/bundle/ruby/1.8/gems/railties-3.2.11/lib/rails/railtie/configurable.rb:30:in `send'
vendor/bundle/ruby/1.8/gems/railties-3.2.11/lib/rails/railtie/configurable.rb:30:in `method_missing'
passenger (3.0.9) lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
passenger (3.0.9) lib/phusion_passenger/abstract_request_handler.rb:513:in `accept_and_process_next_request'
passenger (3.0.9) lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop'
passenger (3.0.9) lib/phusion_passenger/rack/application_spawner.rb:205:in `start_request_handler'
passenger (3.0.9) lib/phusion_passenger/rack/application_spawner.rb:170:in `send'
passenger (3.0.9) lib/phusion_passenger/rack/application_spawner.rb:170:in `handle_spawn_application'
passenger (3.0.9) lib/phusion_passenger/utils.rb:479:in `safe_fork'
passenger (3.0.9) lib/phusion_passenger/rack/application_spawner.rb:165:in `handle_spawn_application'
passenger (3.0.9) lib/phusion_passenger/abstract_server.rb:357:in `__send__'
passenger (3.0.9) lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
passenger (3.0.9) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
passenger (3.0.9) lib/phusion_passenger/abstract_server.rb:180:in `start'
passenger (3.0.9) lib/phusion_passenger/rack/application_spawner.rb:128:in `start'
passenger (3.0.9) lib/phusion_passenger/spawn_manager.rb:253:in `spawn_rack_application'
passenger (3.0.9) lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
passenger (3.0.9) lib/phusion_passenger/spawn_manager.rb:246:in `spawn_rack_application'
passenger (3.0.9) lib/phusion_passenger/abstract_server_collection.rb:82:in `synchronize'
passenger (3.0.9) lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
passenger (3.0.9) lib/phusion_passenger/spawn_manager.rb:244:in `spawn_rack_application'
passenger (3.0.9) lib/phusion_passenger/spawn_manager.rb:137:in `spawn_application'
passenger (3.0.9) lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
passenger (3.0.9) lib/phusion_passenger/abstract_server.rb:357:in `__send__'
passenger (3.0.9) lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
passenger (3.0.9) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
passenger (3.0.9) helper-scripts/passenger-spawn-server:99
表单视图：
<%= form_for(@video) do |f| %>
<% if @video.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@video.errors.count, "error") %> prohibited this video from being saved:</h2>
<ul>
<% @video.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :title %><br />
<%= f.text_field :title %>
</div>
<div class="field">
<%= f.label :link %><br />
<%= f.text_field :link %>
</div>
<div class="field">
<%= f.label :body %><br />
<%= f.text_area :body %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
显示视图：
<p id="notice"><%= notice %></p>
<p>
<b>Title:</b>
<%= @video.title %>
</p>
<p>
<b>Body:</b>
<%= @video.body %>
</p>
<div id="video"><%= raw RedCloth.new(@video.link).to_html %></div>
<%= link_to 'Edit', edit_video_path(@video) %> |
<%= link_to 'Back', videos_path %>