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Diffstat (limited to 'guides/source/rails_on_rack.md')
| -rw-r--r-- | guides/source/rails_on_rack.md | 55 |
1 files changed, 26 insertions, 29 deletions
diff --git a/guides/source/rails_on_rack.md b/guides/source/rails_on_rack.md index d67702f52e..5718b9ddfc 100644 --- a/guides/source/rails_on_rack.md +++ b/guides/source/rails_on_rack.md @@ -20,9 +20,9 @@ Introduction to Rack Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. 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. -* [Rack API Documentation](http://rack.github.io/) - -Explaining Rack is not really in the scope of this guide. In case you are not familiar with Rack's basics, you should check out the [Resources](#resources) section below. +Explaining how Rack works is not really in the scope of this guide. In case you +are not familiar with Rack's basics, you should check out the [Resources](#resources) +section below. Rails on Rack ------------- @@ -64,7 +64,7 @@ To use `rackup` instead of Rails' `rails server`, you can put the following insi ```ruby # Rails.root/config.ru -require ::File.expand_path('../config/environment', __FILE__) +require_relative 'config/environment' run Rails.application ``` @@ -74,7 +74,7 @@ And start the server: $ rackup config.ru ``` -To find out more about different `rackup` options: +To find out more about different `rackup` options, you can run: ```bash $ rackup --help @@ -89,7 +89,8 @@ Action Dispatcher Middleware Stack Many of Action Dispatcher's internal components are implemented as Rack middlewares. `Rails::Application` uses `ActionDispatch::MiddlewareStack` to combine various internal and external middlewares to form a complete Rails Rack application. -NOTE: `ActionDispatch::MiddlewareStack` is Rails equivalent of `Rack::Builder`, but built for better flexibility and more features to meet Rails' requirements. +NOTE: `ActionDispatch::MiddlewareStack` is Rails' equivalent of `Rack::Builder`, +but is built for better flexibility and more features to meet Rails' requirements. ### Inspecting Middleware Stack @@ -105,26 +106,27 @@ For a freshly generated Rails application, this might produce something like: use Rack::Sendfile use ActionDispatch::Static use ActionDispatch::Executor -use #<ActiveSupport::Cache::Strategy::LocalCache::Middleware:0x000000029a0838> +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::RemoteIp use ActionDispatch::Reloader use ActionDispatch::Callbacks use ActiveRecord::Migration::CheckPending -use ActiveRecord::ConnectionAdapters::ConnectionManagement -use ActiveRecord::QueryCache use ActionDispatch::Cookies use ActionDispatch::Session::CookieStore use ActionDispatch::Flash +use ActionDispatch::ContentSecurityPolicy::Middleware use Rack::Head use Rack::ConditionalGet use Rack::ETag -run Rails.application.routes +run MyApp::Application.routes ``` The default middlewares shown here (and some others) are each summarized in the [Internal Middlewares](#internal-middleware-stack) section, below. @@ -149,9 +151,9 @@ You can add a new middleware to the middleware stack using any of the following # Push Rack::BounceFavicon at the bottom config.middleware.use Rack::BounceFavicon -# Add Lifo::Cache after ActiveRecord::QueryCache. +# Add Lifo::Cache after ActionDispatch::Executor. # Pass { page_cache: false } argument to Lifo::Cache. -config.middleware.insert_after ActiveRecord::QueryCache, Lifo::Cache, page_cache: false +config.middleware.insert_after ActionDispatch::Executor, Lifo::Cache, page_cache: false ``` #### Swapping a Middleware @@ -182,7 +184,6 @@ $ bin/rails middleware (in /Users/lifo/Rails/blog) use ActionDispatch::Static use #<ActiveSupport::Cache::Strategy::LocalCache::Middleware:0x00000001c304c8> -use Rack::Runtime ... run Rails.application.routes ``` @@ -239,9 +240,17 @@ Much of Action Controller's functionality is implemented as Middlewares. The fol * Makes a unique `X-Request-Id` header available to the response and enables the `ActionDispatch::Request#request_id` method. +**`ActionDispatch::RemoteIp`** + +* Checks for IP spoofing attacks. + +**`Sprockets::Rails::QuietAssets`** + +* Suppresses logger output for asset requests. + **`Rails::Rack::Logger`** -* Notifies the logs that the request has began. After request is complete, flushes all the logs. +* Notifies the logs that the request has begun. After the request is complete, flushes all the logs. **`ActionDispatch::ShowExceptions`** @@ -251,10 +260,6 @@ Much of Action Controller's functionality is implemented as Middlewares. The fol * Responsible for logging exceptions and showing a debugging page in case the request is local. -**`ActionDispatch::RemoteIp`** - -* Checks for IP spoofing attacks. - **`ActionDispatch::Reloader`** * Provides prepare and cleanup callbacks, intended to assist with code reloading during development. @@ -267,14 +272,6 @@ Much of Action Controller's functionality is implemented as Middlewares. The fol * Checks pending migrations and raises `ActiveRecord::PendingMigrationError` if any migrations are pending. -**`ActiveRecord::ConnectionAdapters::ConnectionManagement`** - -* Cleans active connections after each request, unless the `rack.test` key in the request environment is set to `true`. - -**`ActiveRecord::QueryCache`** - -* Enables the Active Record query cache. - **`ActionDispatch::Cookies`** * Sets cookies for the request. @@ -293,7 +290,7 @@ Much of Action Controller's functionality is implemented as Middlewares. The fol **`Rack::ConditionalGet`** -* Adds support for "Conditional `GET`" so that server responds with nothing if page wasn't changed. +* Adds support for "Conditional `GET`" so that server responds with nothing if the page wasn't changed. **`Rack::ETag`** @@ -306,7 +303,7 @@ Resources ### Learning Rack -* [Official Rack Website](http://rack.github.io) +* [Official Rack Website](https://rack.github.io) * [Introducing Rack](http://chneukirchen.org/blog/archive/2007/02/introducing-rack.html) ### Understanding Middlewares |