From: Pen Ttt <myocean135@...>
Date: 2010-07-20T16:32:26+09:00
Subject: Re: how to judge web exists or not with open-uri?

irb(main):001:0> require 'rubygems'
=> true
irb(main):002:0> require 'open-uri'
=> true
irb(main):003:0> url = URI.parse('www.123.com')
=> #<URI::Generic:0xb764ff84 URL:www.123.com>
irb(main):004:0> status = Net::HTTP.start(url.host, url.port) {|http|
irb(main):005:1*   http.head(url.path)
irb(main):006:1> }
NameError: uninitialized constant Net
  from (irb):4
  from :0
irb(main):007:0> puts( /^2/ =~ status.code ? "ok" : "nok" )
NoMethodError: undefined method `code' for nil:NilClass
  from (irb):7
  from :0
??
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