ruby-on-rails – Rails：Gravatar图片未显示在Chrome中

我正在研究Michael Hartl的 Ruby on Rails Tutorial,并且我添加了代码来显示用户的Gravatar图像.它在Firefox和Safari中运行良好,但在Chrome中则不行(图像不会显示).

风景：

#app/views/users/show.html.erb

<% provide(:title, @user.name) %>
<h1>
  <%= gravatar_for @user %>
  <%= @user.name %>
</h1>

和帮手：

#app/helpers/users_helper.rb

module UsersHelper

  # Returns the Gravatar (http://gravatar.com/) for the given user.
  def gravatar_for(user)
    gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
    gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}"
    image_tag(gravatar_url, alt: user.name, class: "gravatar")
  end
end

这有什么不对？

对我来说,我不得不将( http://localhost:3000/)添加到Ghostery的白名单网站来解决同样的问题.