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我在我的 Rails 应用程序中使用 Twitter Bootstrap。我最近开始遇到一个问题，如果我从 Firefox 调用该应用程序，一切正常，如果我从我的 iPhone 或 Chrome 调用它，它就会失败。

下面是测试服务器日志文件的相关信息：

当我尝试使用 iPhone 或 Chrome 时：

Started GET "/" for xx.xxx.xxx.xx at 2013-06-18 18:20:58 +0000
Processing by PagesController#home as HTML
  BlogPost Load (0.3ms)  SELECT `blog_posts`.* FROM `blog_posts` 
  Rendered pages/home.html.erb within layouts/application (78.0ms)
  Rendered layouts/_shim.html.erb (0.4ms)
  Rendered layouts/_header.html.erb (3.5ms)
  Rendered layouts/_promo_bar.html.erb (65.5ms)
Completed 500 Internal Server Error in 539ms

当我使用 Firefox 时：

Started GET "/" for xx.xxx.xx.xx at 2013-06-18 18:21:43 +0000
  User Load (55.1ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 2 LIMIT 1
Processing by PagesController#home as HTML
  BlogPost Load (2.3ms)  SELECT `blog_posts`.* FROM `blog_posts` 
  Rendered pages/home.html.erb within layouts/application (16.9ms)
  Rendered layouts/_shim.html.erb (0.4ms)
  Rendered layouts/_header.html.erb (7.4ms)
  User Load (8.8ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 2
  User Load (6.5ms)  SELECT `users`.* FROM `users` WHERE `users`.`email` = 'mine@mydomain.com'
  Rendered layouts/_promo_bar.html.erb (14.8ms)
  Rendered layouts/_footer.html.erb (8.7ms)
Completed 200 OK in 566ms (Views: 362.7ms | ActiveRecord: 81.0ms)

因此，它在处理 layouts/_footer.html.erb 时失败了。请注意，这是唯一使用 Twitter Boostrap 功能的文件。以下是布局/_footer.html.erb

<% admin = nil %>
<% if user_signed_in? %>
    <% roles = array_from_json(current_user.role) %>
    <% if roles.include?("admin") %>
        <% admin = TRUE %>
    <% end %>
<% end %>

<footer class="footer">
  <div class="footer_column left_padding">
    <ul class="footer_column_list">
      <li class="footer_column_header"><%= link_to "About", about_path %></li>
      <li><%= link_to "Mission", about_path %>         </li>
      <li><%= link_to "Team", our_team_path %>            </li>
      <li><%= link_to "Advisory Board", advisors_path %>  </li>
    </ul>
  </div>

  <div class="footer_column">
    <ul class="footer_column_list">
      <li class="footer_column_header"><%= link_to "Conference", event_path(Current_event_id.to_s) %></li>
      <li><%= link_to "Description", event_path(Current_event_id.to_s) %></li>
      <li><%= link_to "Speakers", speakers_path %></li>
      <li><%= link_to "Schedule", schedule_path %></li>
      <li><%= link_to "Travel Information", travel_path %></li>
      <li><%= link_to REQUEST_INVITE_TITLE, new_user_registration_path %></li>
    </ul>
  </div>

  <% if admin %>
      <div class="footer_column">
        <ul class="footer_column_list">
          <li class="dropdown" id="admin_menu">
            <a class="footer_column_header" data-toggle="dropdown" data-target="#admin_menu">
              <%= ADMIN_TITLE %>
              <b class="caret"></b>
            </a>
            <ul class="dropdown-menu">
              <% Admin_menu.each do |menu_text, menu_action| %>
                  <li><a href="<%= menu_action %>"><%= menu_text %></a></li>
              <% end %>
            </ul>
          </li>
        </ul>
      </div>
  <% else %>
      <div class="footer_column">
        <ul class="footer_column_list">
          <li class="footer_column_header">Admin Functions</li>
          <li><%= link_to "Admin log-in", new_user_session_path %></li>
        </ul>
      </div>
  <% end %>

  <div class="footer_column">
    <ul class="footer_column_list last_on_right">
      <li class="footer_column_header"><%= link_to "Blog", "http://ourblogg.com/" %></li>
      <li><%= image_tag('facebook-icon.png') %> <%= link_to "Facebook", "http://www.facebook.com/ourfbaccount" %></li>
      <li><%= image_tag('twitter-icon.png') %> <%= link_to "Twitter", "http://twitter.com/ourtwacct" %></li>
    </ul>
  </div>

</footer>

这可能是 Twitter Bootstrap 问题，如果是这样，有什么解决方法的想法吗？

附加说明：

当我在测试服务器上预编译资产时：

RAILS_ENV=test bundle exec rake assets:precompile

我收到以下警告：

WARNING: Nokogiri was built against LibXML version 2.8.0, but has dynamically loaded 2.7.6
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