From: "Joseph E. Savard" <joseph.savard@...>
Date: 2010-07-20T21:32:12+09:00
Subject: Re: how to judge web exists or not with open-uri?

irb(main):017:0> def getURL(u)
irb(main):018:1> begin
irb(main):019:2*   x = open(u)
irb(main):020:2> rescue
irb(main):021:2>   puts "url does not exist"
irb(main):022:2> end
irb(main):023:1> end
=> nil
irb(main):025:0> getURL("http://www.awqes.com")
url does not exist
=> nil
irb(main):026:0> getURL("http://www.google.com")
=> #<StringIO:0x15bd550>
irb(main):027:0> 

Not the string "url does not exist" is for visual confirmation.

Though the x is returned as nil on a non-existent URL.

`
> From: Pen Ttt <myocean135@yahoo.cn>
> Reply-To: <ruby-talk@ruby-lang.org>
> Newsgroups: comp.lang.ruby
> Date: Tue, 20 Jul 2010 14:00:57 +0900
> To: ruby-talk ML <ruby-talk@ruby-lang.org>
> Subject: how to judge web exists or not with open-uri?
> 
> would you mind to tell me how to fix it, to make the following program
> to run?
> require 'rubygems'
> require 'open-uri'
> url="www.123.com"
> open(url){|file| if url don't exists then puts "url don't exists"
> else puts "url exists"}
> thiks
> -- 
> Posted via http://www.ruby-forum.com/.
>