He found that in thisĬase 5-20% of requests will not be cached. '.avoiding a querystring for cacheable resources'. Not all caches will reliably cache content where the filename only differs by The query string strategy has several disadvantages: The technique sprockets uses for fingerprinting is to insert a hash of theĬontent into the name, usually at the end. This is generally known as cache busting. Or in web browsers) to keep their own copy of the content. When a filename is unique and based on its content, HTTP headers can be set toĮncourage caches everywhere (whether at CDNs, at ISPs, in networking equipment, For content that is static or infrequently changed, this provides anĮasy way to tell whether two versions of a file are identical, even across When the file contents change, the filename is alsoĬhanged. 1.2 What is Fingerprinting and Why Should I Care?įingerprinting is a technique that makes the name of a file dependent on theĬontents of the file. Languages include Sass for CSS, CoffeeScript for JavaScript, and ERB for both byĭefault. Higher-level language, with precompilation down to the actual assets. The third feature of the asset pipeline is it allows coding assets via a The second feature of the asset pipeline is asset minification or compression.įor CSS files, this is done by removing whitespace and comments. Which happens automatically whenever you change the file contents.

You can invalidate the cache by altering this fingerprint, Rails inserts an MD5 fingerprint into each filename so that the file is cachedīy the web browser. As you'll learn later in this guide, youĬan customize this strategy to group files any way you like. js file and allĬSS files into one master. Sprockets concatenates all JavaScript files into one master. Requests can mean faster loading for your application. Limited in the number of requests that they can make in parallel, so fewer Number of requests that a browser makes to render a web page. The first feature of the pipeline is to concatenate assets, which can reduce the In the Gemfile and no _compressor option is set. The sass-rails gem is automatically used for CSS compression if included Start Here Getting Started with Rails Models Active Record Basics Active Record Migrations Active Record Validations Active Record Callbacks Active Record Associations Active Record Query Interface Views Layouts and Rendering in Rails Action View Form Helpers Controllers Action Controller Overview Rails Routing from the Outside In Digging Deeper Active Support Core Extensions Rails Internationalization API Action Mailer Basics Active Job Basics Testing Rails Applications Securing Rails Applications Debugging Rails Applications Configuring Rails Applications The Rails Command Line Asset Pipeline Working with JavaScript in Rails Autoloading and Reloading Constants Caching with Rails: An Overview Using Rails for API-only Applications Action Cable Overview Extending Rails Rails on Rack Creating and Customizing Rails Generators Contributing to Ruby on Rails Contributing to Ruby on Rails API Documentation Guidelines Ruby on Rails Guides Guidelines Maintenance Policy Maintenance Policy Release Notes Upgrading Ruby on Rails Ruby on Rails 5.0 Release Notes Ruby on Rails 4.2 Release Notes Ruby on Rails 4.1 Release Notes Ruby on Rails 4.0 Release Notes Ruby on Rails 3.2 Release Notes Ruby on Rails 3.1 Release Notes Ruby on Rails 3.0 Release Notes Ruby on Rails 2.3 Release Notes Ruby on Rails 2.2 Release Notes

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