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copied!<p>This will happen when (1) your assets use paths, for example:</p> <pre><code>background:url(image_path('awesome-background.gif')) </code></pre> <p>and (2) your <code>asset_host</code> is set to a lambda/proc that requires the second argument (<code>request</code>).</p> <p>Your options are to either remove the <code>request</code> argument (if you don't actually use it) or make it optional (and handle the case where it is <code>nil</code>). This is easy in Ruby 1.9 (and should be easier, see notes):</p> <pre><code>config.action_controller.asset_host = ->(source, request = nil, *_){ # ... just be careful that request can be nil } </code></pre> <p>If you want to be compatible with Ruby 1.8, there is no direct way to create a Proc/lambda with parameters with defaults, but you can use:</p> <pre><code>config.action_controller.asset_host = Proc.new do |*args| source, request = args # ... end </code></pre> <p>Or do it using a method:</p> <pre><code>def MyApp.compute_asset_host(source, request = nil) # ... end config.action_controller.asset_host = MyApp.method(:compute_asset_host) </code></pre> <p><em>Notes:</em></p> <ol> <li>Your block can return <code>nil</code> to signify the "default host", no need to use <code>"#{request.protocol}#{request.host_with_port}"</code></li> <li>In theory you don't need to specify the protocol; a url starting with <code>//</code> should use the default protocol (http or https). I'm saying "should" as it looks like <a href="http://www.stevesouders.com/blog/2010/02/10/5a-missing-schema-double-download/" rel="noreferrer">IE <= 8 will download the css assets twice</a> and I've ran into problems with PDFkit.</li> </ol> <p>So in your particular case, your <code>asset_host</code> can be simplified to:</p> <pre><code>config.action_controller.asset_host = Proc.new { |source, request = nil, *_| "//assets#{(source.length % 4) + 1}.example.com" if request && !request.ssl? } </code></pre> <p><em>Edit</em>: Use a lambda or else the <code>*_</code> to avoid a <a href="http://redmine.ruby-lang.org/issues/5694" rel="noreferrer"><strike>bug</strike> feature of Ruby</a>.</p>

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