问题
My favicon just won't show, in Chrome or Firefox. This is how I am rendering it in the <head> section:
<%= favicon_link_tag 'favicon.ico' %>
It is located in public/images.
This is the produced HTML:
<link rel="shortcut icon" type="image/x-icon" href="/images/favicon.ico">
Opening the link in my browser shows the icon correctly.
回答1:
The favicon is not handled by the asset pipeline when its in the public folder, and this can cause caching problems.
See here: How to add favicon in rails 3.2 and Clear the cache from the Rails asset pipeline.
Use the favicon_link_tag and place the .ico file in /app/assets/images/ to get it into the asset pipeline.
If it still doesn't work after that, try clearing your browser cache, your rails cache, and restarting your rails server.
来源：https://stackoverflow.com/questions/31686624/rails-4-favicon-not-showing