From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2011-05-04T17:13:48+09:00
Subject: Re: Check url address

On Wed, May 4, 2011 at 9:50 AM, Lukáš N. <dmnc.mobile@gmail.com> wrote:
> Hello all,
>
> i would like to do something like define two urls, primary and
> secondary. After that, check them and if primary is not available,
> choose secondary url. At the end, put these to some variable for next
> usage.

You can try to open the first URL and if there's any exception, use
the second one.
Something like:

ruby-1.9.1-p431 :004 > require 'open-uri'
 => true
ruby-1.9.1-p431 :005 > url1 = "http://fsdfsdfsdf.com"
 => "http://fsdfsdfsdf.com"
ruby-1.9.1-p431 :006 > url2 = "http://www.google.com"
 => "http://www.google.com"
ruby-1.9.1-p431 :007 > valid_url = begin
ruby-1.9.1-p431 :008 >     open(url1)
ruby-1.9.1-p431 :009?>     url1
ruby-1.9.1-p431 :010?>   rescue
ruby-1.9.1-p431 :011?>   url2
ruby-1.9.1-p431 :012?>   end
 => "http://www.google.com"
ruby-1.9.1-p431 :013 > valid_url
 => "http://www.google.com"

Jesus.