From: Nigel Gilbert <n.gilbert@...>
Date: 2003-06-19T21:08:51+09:00
Subject: Re: TCP/IP protocol and Net::HTTP

I am beginning to wonder if this problem arises from the MacOS X  
implementation of ruby.  Those who have tried to reproduce the problem  
(thanks to you all) have had no difficulty accessing doubleclick from  
Linux and I have also succeeded with a Solaris implementation at my  
university (could someone try it on Windows?)

On the other hand, I get the timeout error on MacOS X both at home  
(with a cable modem connection) and at my university (with a direct  
connection to the internet).

If there is someone out there using MacOSX, could you try it and see  
whether this theory is correct?  What you need to do is:

1. fire up irb
2. enter
require 'net/http'
3. enter
Net::HTTP.get_print 'ad.doubleclick.net', '/'
4. tell me whether you get a Timeout error, or alternatively some lines  
of HTML, starting:
<html>
<body bgcolor=#ffffff>
<b>This is a DoubleClick advertising server.</b>

Thanks.


Nigel


On Thursday, June 19, 2003, at 11:23 AM, J.Hawkesworth wrote:

> Works for me too.
>
> You aren't being stung by some institutional proxy server or something
> like that (sorry I don't know much about networks) are you?  I imagine
> ad.doubleclick.net gets a lot of hits.
>
> Jon
>
> -----Original Message-----
> From: Nigel Gilbert [mailto:n.gilbert@soc.surrey.ac.uk]
> Sent: 18 June 2003 19:25
> To: ruby-talk ML
> Subject: TCP/IP protocol and Net::HTTP
>
>
> For almost all web sites, such as www.ruby-lang.org, the code
>
> Net::HTTP.get_print 'www.ruby-lang.org', '/'
>
> works without a problem, returning the home page.
>
> However, 'ad.doubleclick.net' is an exception.  The code;
>
> Net::HTTP.get_print 'ad.doubleclick.net', '/'
>
> times out.  If you access this site in a web browser, there is no
> problem getting the home page from doubleclick; it arrives almost
> immediately.
>
> By watching the ethernet traffic, it seems that doubleclick replies
> from a different IP address than the address corresponding to the
> domain name, but ruby keeps listening to responses from the domain
> address  (note this is _not_ a 302 redirect; it is all happening at a
> much lower level).  Eventually, there is a timeout error from
> /usr/local/lib/ruby/1.6/net/protocol.rb:449:in `initialize'.  Is this
> possible within the TCP/IP protocol?  Is this something that has been
> dealt with in a latter release (I am still using ruby 1.6.8).  Is there
> some workaround?
>
> Nigel
>
>
>
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