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The Rails culture is steeped in open source tradition. The Rails source code is, of course, open. And it s significant that Rails is licensed under the MIT license, arguably one of the most free software licenses in existence. Rails also advocates the use of open source tools and encourages the collaborative spirit of open source. The code that makes up Rails is 100% free and can be downloaded, modified, and redistributed by anyone at any time. Moreover, anyone is free to submit patches for bugs or features, and hundreds of people from all over the world have contributed to the project over the past two years. You ll probably notice that a lot of Rails developers use Macs. The Mac is clearly the preferred platform of many core Rails team developers, and most Rails developers are using UNIX variants (of which Mac OS X is one). The UNIX operating system is hailed by hackers and used almost exclusively among the hacker elite. There are several reasons for this, not least of which is the fact that UNIX is a well-tested and proven operating system, forged in an open source ecosystem, with contributions from

ftp://username:password@ftp.example.com/pub/folder;type=a Also note that uri is good at adjusting URLs in a safe manner, as you can set the various attributes to new values, as well as read them: require 'uri' my_url = "http://www.test.com/something/test.html" url = URI.parse(my_url) url.host = "www.test2.com" url.port = 1234 puts url.to_s

A proxy-cluster server is a new and very powerful way to deploy your Rails application stack. This type of architecture has come to dominate the Rails deployment world in recent months due to its stability, flexibility, and ease of use. In this configuration, the web server and the Rails server are two separate entities, as shown in Figure 11-2. The web server handles the incoming requests on the standard HTTP port (80), and then redirects those requests to separate Rails server instances that are running either on the same machine or separate machines.

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Standard library documentation for uri: http://www.ruby-doc.org/stdlib/libdoc/uri/ rdoc/index.html Information about URLs and URIs: http://en.wikipedia.org/wiki/URL

To use jQuery in your application, you must first install the jQuery JavaScript adapter. Rails integrates with JavaScript libraries using adapters; the adapter is a JavaScript file that s available in public/javascripts/rails.js. The current rails.js adapter in your application is the default adapter for Prototype; you replace it with the jQuery adapter that s available to download from http://github.com/rails/jquery-ujs/raw/master/src/rails.js. Download the file, and replace your existing JavaScript adapter in public/javascripts/rails.js. After replacing the adapter, you need to get rid of the Prototype library files and include the jQuery ones. Remove the Prototype library by deleting its four files: controls.js, dragdrop.js, effects.js, and prototype.js from public/javascripts/. Then, download the jQuery library from http://code.jquery.com/jquery-1.4.2.min.js, and place it in the same directory in public/javascripts/jquery-1.4.2.min.js. The last thing you need to do is to make sure your application layout includes the JavaScript files you just added to the project. Open your application layout template from app/views/layouts/application.html.erb, and update the javascript_include_tag call so the file looks like Listing 8-1. Listing 8-1. Importing the jQuery JavaScript File in app/views/layouts/application.html.erb: http://gist.github.com/352367 <!DOCTYPE html> <html> <head> <title>Blog</title> <%= stylesheet_link_tag :all %> <%= javascript_include_tag 'jquery-1.4.2.min', 'rails', 'application' %> <%= csrf_meta_tag %> </head> <body> <div id="header"> <h1><%= link_to "Blog", root_path %></h1> <div id="user_bar">

zlib is an open source data-compression library. It s a significant standard in data compression, and you can manipulate zlib archives on almost every platform. Notably, zlib is often used to compress web pages between servers and web browsers, is used in the Linux kernel, and forms a key part of many operating system libraries. You can use zlib from Ruby as a mechanism to compress and uncompress data.

As you can see from Figure 11-2, all requests to the application initially go to the web server. Then the web server acts as a proxy handler and passes the request on to a specialized Rails server. By far, the most popular of these servers at the moment is Mongrel (created by Zed Shaw).

zlib is in the standard library, so comes with Ruby by default. To use it, you only need to place this line near the start of your program: require 'zlib'

<% if logged_in %> <%= link_to "New Article", new_article_path %> | <%= link_to "Edit Password", edit_user_path(current_user) %> | <%= link_to "Logout", logout_path %> <% else %> <%= link_to "Login", login_path %> <% end %> </div> </div> <div id="main"> <%= content_tag(:p, notice, :class => 'notice') if notice.present %> <%= content_tag(:p, alert, :class => 'alert') if alert.present %> <%= yield %> </div> <div id="footer"> A simple blog built for the book <a href="http://beginningrails.com">Beginning Rails 3</a> </div> </body> </html>

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