Without the asset pipeline ( skip_pipeline: true)Īccepts a type option that can specify the asset's extension. With the asset pipelineĪll options passed to asset_path will be passed to compute_asset_path which is implemented by asset pipeline gems. You can bypass the asset pipeline by passing in skip_pipeline: true to the options.Īll other asset *_path helpers delegate through this method. propshaft or sprockets-rails), the behavior is “enhanced”. config.action_controller.asset_host = AssetHostingWithMinimumSsl.new( You can also implement a custom asset host object that responds to call and takes either one or two parameters just like the proc. See for background and for connection limit data.Īlternatively, you can exert more control over the asset host by setting asset_host to a proc like this: ActionController::Base.asset_host = Proc.new " Note: This is purely a browser performance optimization and is not meant for server load balancing. You can read more about setting up your DNS CNAME records from your ISP. To implement the corresponding hosts you can either set up four actual hosts or use wildcard DNS to CNAME the wildcard to a single asset host. You should be sure to measure your actual performance across targeted browsers both before and after this change. It is also possible the combination of additional connection overhead (DNS, SSL) and the overall browser connection limits may result in this solution being slower. This may improve the asset loading performance of your application. For example, assets%d. will spread the asset requests over “”, …, “”. You can use the %d wildcard in the asset_host to distribute the requests over four hosts. This limit may cause some asset downloads to wait for previous assets to finish before they can begin. The exact number varies by browser and version. Helpers take that into account: image_tag("rails.png")īrowsers open a limited number of simultaneous connections to a single host. For example, you'd define to be your asset host this way, inside the configure block of your environment-specific configuration files or config/application.rb: config.action_controller.asset_host = "" image_path("rails.png")īy default, Rails links to these assets on the current host in the public folder, but you can direct Rails to link to assets from a dedicated asset server by setting ActionController::Base.asset_host in the application configuration, typically in config/environments/production.rb. This module provides methods for generating asset paths and URLs.
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