From: Roseanne Zhang <roseanne@...>
Date: 2007-06-15T22:41:43+09:00
Subject: Re: How to set the timeout attr when using open-uri to open

sishen wrote:
> Yes, i know that. Thanks. :)
> 
> But i confused by the read_timeout option of the open method.

Read here. it might help:

  open(name, *rest, &block)

makes possible to open various resources including URIs. If the first 
argument respond to `open’ method, the method is called with the rest 
arguments.

If the first argument is a string which begins with xxx://, it is parsed 
by URI.parse. If the parsed object respond to `open’ method, the method 
is called with the rest arguments.

Otherwise original open is called.

Since open-uri.rb provides URI::HTTP#open, URI::HTTPS#open and 
URI::FTP#open, Kernel[#.]open can accepts such URIs and strings which 
begins with http://, https:// and ftp://. In these case, the opened file 
object is extended by OpenURI::Meta.

copied from
http://www.ruby-doc.org/core/classes/Kernel.html#M005991

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