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    <p>I've tried your configuration, but when I use <code>config.action_controller.asset_host = "assets.myserver.com"</code> in my <code>development.rb</code> <code>image_tag</code> works as expected:</p> <pre><code>&lt;img alt="Header" src="http://assets.myserver.com/assets/header.jpg" /&gt; </code></pre> <p>I've tested it both under Rails 3.2.7 and 3.2.8, but it works in both versions.</p> <p><strong>UPDATE</strong></p> <p>In my original answer I didn't use the <code>rails-api</code> gem. When using the <code>rails-api</code> gem <code>image_tag</code> works as described in the question.</p> <p>Well to answer the actual question, you could add an initializer in <code>config/initializers</code>. Just create a file, lets say <code>image_tag_helper.rb</code>, with the following code:</p> <pre><code># config/initializers/image_tag_helper.rb module ActionView module Helpers module AssetTagHelper def image_tag(source, options = {}) options[:src] = "http://#{source}" tag("img", options) end end end end </code></pre> <p>What this basically does is reopening the module and replace the <code>image_tag</code> method with your own method. All other methods within the <code>module AssetTagHelper</code> remain the same. Take a look at the Rails <a href="https://github.com/rails/rails/blob/e826a5c749f9a4029a3b2a7e3d371498feeb9b10/actionpack/lib/action_view/helpers/asset_tag_helper.rb#L356" rel="nofollow">repository at github</a> for a complete 'example' of the <code>image_tag</code> method.</p> <p>The name of the file doesn't really matter. All files within <code>config/initializers</code> are loaded when the application is booted.</p> <p>Basically this is a language feature of Ruby, Ruby allows you to reopen classes everywhere in your code and add or replace methods (you find more on this subject at <a href="http://rubylearning.com/satishtalim/ruby_overriding_methods.html" rel="nofollow">rubylearning.com</a>).</p>
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    1. PORails (3.2.7): override image_tag for asset_host
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    1. COAre you using the `rails-api` gem?
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      1. USMichael Irey
    2. COno I don't, I apparently missed that line when reading your question.
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