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memory and processor usage. However, generally it s more acceptable to use URI() or URI.parse so that you can address the different elements by name, rather than rely on the order of elements in an array (which could change between versions of the library).

You can also use uri to create URLs that meet the accepted specifications. At their simplest, you can use the URI subclasses for each protocol to generate URLs by passing in a hash of the elements you want to make up the URL: require 'uri' u = URI::HTTP.build( :host => 'rubyinside.com', :path => '/' ) puts u.to_s puts u.request_uri

This isn t meant to deter developers; rather, it means that in order to truly appreciate Rails, you may need a history lesson in the technologies from whose ashes Rails has risen Sometimes, until you ve experienced the hurt, you can t appreciate the cure..

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requests an image, Apache handles it directly. If a remote computer requests a dynamic page, Apache handles the request using its own captive Rails running inside the server. This means that Apache handles the request end to end, as the web server and the Rails server. In this setup, the glue that goes between Apache and the actual Rails code itself is FastCGI (FCGI), which is a protocol for interfacing any interactive programs with a web server. FCGI is a vast improvement over traditional CGI bindings.

http://rubyinside.com/ /

Note that to_s returns the entire URL, whereas request_uri returns the portion of the URL that follows the hostname. This is because libraries such as net/http would use the data from request_uri, whereas libraries such as open-uri can use the entire URL. You could also pass in :port, :query, :fragment, :userinfo, and other elements to the URI subclasses to generate more complex URLs. Here s an example of creating an FTP URL: ftp_url = URI::FTP.build( :userinfo => 'username:password', :host => 'ftp.example.com', :path => '/pub/folder', :typecode => 'a') puts ftp_url.to_s

Figure 11-1. Monolithic setup The problem with this setup is that occasionally your Rails applications might crash. Now, don t get into a panic. This is fairly rare. But what if someone sends you a packet of information that confuses your Rails application and it fails In a monolithic setup, if this happens, it very well may take Apache down with it. Another disadvantage is that if you need to upgrade the Rails code, you have to restart the whole stack at the same time. This results in downtime. Any request coming into the server while you are restarting fails. Even worse, if your code update contained a bug, you d be stuck with a server that is dead in the water. Monolithic web application architectures are extremely well tested and well worn. They are what drive most of the applications on the web today. The reason for this popularity is its maturity and the fact that you only need to understand how to run one type of system: Apache (or your web server of choice).

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