{"id":3705,"date":"2022-08-25T07:51:04","date_gmt":"2022-08-25T07:51:04","guid":{"rendered":"http:\/\/the-codest.localhost\/blog\/the-role-of-rack-in-the-ruby-ecosystem\/"},"modified":"2026-03-11T05:59:57","modified_gmt":"2026-03-11T05:59:57","slug":"el-papel-de-rack-en-el-ecosistema-ruby","status":"publish","type":"post","link":"https:\/\/thecodest.co\/es\/blog\/the-role-of-rack-in-the-ruby-ecosystem\/","title":{"rendered":"El papel de Rack en el ecosistema Ruby"},"content":{"rendered":"\n<p>While working with <strong><a href=\"https:\/\/thecodest.co\/es\/case-studies\/providing-a-team-of-ruby-developers-for-a-fintech-company\/\">Ruby<\/a> <a href=\"https:\/\/thecodest.co\/es\/blog\/find-your-ideal-stack-for-web-development\/\">web<\/a> frameworks<\/strong> it\u2019s common to take things for granted. We know the framework will handle the HTTP requests and execute the middleware logic for <a href=\"https:\/\/thecodest.co\/es\/blog\/why-us-companies-are-opting-for-polish-developers\/\">us<\/a>. As we get more curious we start wondering what is behind the scenes, there\u2019s where we start hearing about Rack.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is Rack?<\/h2>\n\n\n\n<p>The <a href=\"https:\/\/thecodest.co\/es\/dictionary\/why-do-projects-fail\/\">project<\/a> is described as \u201cA modular Ruby web server interface\u201d. Rack is the interface that let us create web applications unifying the <a href=\"https:\/\/thecodest.co\/es\/blog\/compare-staff-augmentation-firms-that-excel-in-api-team-staffing-for-financial-technology-projects\/\">API<\/a> for web servers, web frameworks, and middleware.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"\/app\/uploads\/2024\/05\/rack.png\" alt=\"rack ruby scheme\" title=\"ruby enviroment scheme \"\/><\/figure>\n\n\n\n<p>As described in the above picture, Rack acts as a middleman between our Web Application and the Application Server, it wraps the HTTP requests in the simplest<br>way possible.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Rack Application<\/h2>\n\n\n\n<p>A Rack application is a Ruby object (not a class) that responds to <code>call<\/code>. It takes exactly one argument, the <strong><em>environment<\/em><\/strong> and returns a non-frozen Array of<br>exactly three values:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <strong><em>status<\/em>,<\/strong><\/li>\n\n\n\n<li>the <strong><em>headers<\/em>,<\/strong><\/li>\n\n\n\n<li> <p>and the <strong>body<\/strong>.<\/p> <p><em>You can find the detailed specification of a Rack Application<\/em> <a href=\"https:\/\/github.com\/rack\/rack\/blob\/main\/SPEC.rdoc\">here<\/a>.<\/p> <\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby\">require 'rack'\n\nclass RackApp\n  def call(env)\n        status = 200\n        headers = { 'Content-Type' =&gt; 'text\/html' }\n        body = ['&lt;h1&gt;My Rack App&lt;h1&gt;']\n\n    [status, headers, body]\n  end\nend<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Rack::Handler<\/h2>\n\n\n\n<p>Handlers connect web servers with Rack. Rack includes Handlers for Thin, WEBrick,FastCGI, CGI, SCGI and LiteSpeed. Each application server that supports Rack should<br>provide a handler to create the connection (Puma has its own handler).Handlers usually are activated by calling <code>MyHandler.run(myapp)<\/code>. A second optional <a href=\"https:\/\/thecodest.co\/es\/blog\/hash-to-use-or-not-to-use\/\">hash<\/a> can be passed to include server-specific configuration.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby\">Using Thin application server\n\nRack::Handler::Thin.run(app)<\/code><\/pre>\n\n\n\n<p>The default file to add the configuration is <code>config.ru<\/code> and you can execute itusing <code>rackup<\/code> command in your console.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Rack Middleware<\/h2>\n\n\n\n<p>Rack allows us to create middleware applications (applications between our main web application and the application server). These middleware applications are chained together and executed sequentially.<\/p>\n\n\n\n<p>Rack Middleware must implement all the specifications of a <strong>Rack Application<\/strong> and meet the following points:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>It must be a class,<\/li>\n\n\n\n<li>have an initializer that receives only one parameter (the main application),<\/li>\n\n\n\n<li>and call the next middleware or the application.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby\">class RackMiddleware\ndef initialize(app)\n@app = app\nend\ndef call(env)\n@app.call(env)\nend\nend<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Rack into Practice<\/h2>\n\n\n\n<p>Now that we know the basics, we are ready to create our first Rack Application with Rack Middleware and run it using Puma (Application Server).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Install the dependencies<\/h3>\n\n\n\n<p>Make sure you have the <code>rack<\/code> gem and the <code>puma<\/code> gem installed.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby\">gem install rack\ngem install puma<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Create the configuration file<\/h3>\n\n\n\n<p>First, we have to create a file called <code>config.ru<\/code> and this file will make use of<br>the Rack::Builder DSL to run the application and add the middleware.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Add the Rack Application<\/h3>\n\n\n\n<p>Within the <code>config.ru<\/code> file, we will add the simple Rack Application we defined in<br>the previous sections.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby\"># config.ru\n\nclass RackApp\n  def call(env)\n    status = 200\n    headers = { 'Content-Type' =&gt; 'text\/html' }\n    body = ['&lt;h1&gt;My Rack App&lt;h1&gt;']\n\n    [status, headers, body]\n  end\nend<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Add the Rack Middleware<\/h3>\n\n\n\n<p>Here we will make a small modification to our simple middleware and now it will add the server software to our HTML body after being executed.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby\"># config.ru\n\nclass RackMiddleware\n  def initialize(app)\n    @app = app\n  end\n\n  def call(env)\n    status, headers, body = @app.call(env)\n\n    body &lt;&lt; env['SERVER_SOFTWARE']\n\n    [status, headers, body]\n  end\nend<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Run the Application Server<\/h3>\n\n\n\n<p>As a last step, we will run the server and see our application running. Our <code>config.ru<\/code> file will look as follows:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby\"># config.ru\n\nclass RackApp\n  def call(env)\n    status = 200\n    headers = { 'Content-Type' =&gt; 'text\/html' }\n    body = ['&lt;h1&gt;My Rack App&lt;h1&gt;']\n\n    [status, headers, body]\n  end\nend\n\nclass RackMiddleware\n  def initialize(app)\n    @app = app\n  end\n\n  def call(env)\n    status, headers, body = @app.call(env)\n\n    body &lt;&lt; env['SERVER_SOFTWARE']\n\n    [status, headers, body]\n  end\nend\n\nuse RackMiddleware\nrun RackApp.new<\/code><\/pre>\n\n\n\n<p>In the last lines, we specify the middleware using <code>use<\/code> and we run the application using <code>run.<\/code>We are ready to execute <code>rackup<\/code> in our console and see the server running. We can check the port where our application is running and we should see something like this after accessing it:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"\/app\/uploads\/2024\/05\/rack_server.png\" alt=\"rack server text \" title=\"Rack App Birdie's Version\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusions<\/h2>\n\n\n\n<p>Sometimes is good to go back to the basics and learn about the insights into the technology we work with. Learning Rack give us a clear overview of the architecture and reveals the \u201cmagic\u201d behind the <strong>Ruby Web Frameworks<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/thecodest.co\/contact\"><img decoding=\"async\" src=\"\/app\/uploads\/2024\/05\/interested_in_cooperation_.png\" alt=\"cooperation banner\"\/><\/a><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Aprenda m\u00e1s sobre el papel del rack en el ecosistema de Ruby de la mano de nuestro experto y mejore sus habilidades con Ruby.<\/p>","protected":false},"author":2,"featured_media":3706,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[8],"tags":[20],"class_list":["post-3705","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software-development","tag-software-development"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - 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