Rails provides a simple configuration interface config.middleware for adding, removing, and modifying the middlewares in the middleware stack via application.rb or the environment specific configuration file environments/.rb. The default middlewares shown here (and some others) are each summarized in the Internal Middlewares section, below. Use Rack :: Sendfile use ActionDispatch :: Static use ActionDispatch :: Executor use ActiveSupport :: Cache :: Strategy :: LocalCache :: Middleware use Rack :: Runtime use Rack :: MethodOverride use ActionDispatch :: RequestId use ActionDispatch :: RemoteIp use Sprockets :: Rails :: QuietAssets use Rails :: Rack :: Logger use ActionDispatch :: ShowExceptions use WebConsole :: Middleware use ActionDispatch :: DebugExceptions use ActionDispatch :: ActionableExceptions use ActionDispatch :: Reloader use ActionDispatch :: Callbacks use ActiveRecord :: Migration :: CheckPending use ActionDispatch :: Cookies use ActionDispatch :: Session :: CookieStore use ActionDispatch :: Flash use ActionDispatch :: ContentSecurityPolicy :: Middleware use Rack :: Head use Rack :: ConditionalGet use Rack :: ETag use Rack :: TempfileReaper run MyApp :: Application. Here's how bin/rails server creates an instance of Rack::Server 2.2 bin/rails serverīin/rails server does the basic job of creating a Rack::Server object and starting the web server. Rails.application object to serve a Rails application. Any Rack compliant web server should be using Rails.application is the primary Rack application object of a RailsĪpplication. 2 Rails on Rack 2.1 Rails Application's Rack Object In case youĪre not familiar with Rack's basics, you should check out the Resources
The rack app software#
By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.Įxplaining how Rack works is not really in the scope of this guide.
Rack provides a minimal, modular, and adaptable interface for developing web applications in Ruby.
This guide assumes a working knowledge of Rack protocol and Rack concepts such as middlewares, URL maps, and Rack::Builder.
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