Can you post one of these links so we can look at it in particular?
I think this may help:

http://stackoverflow.com/questions/301924/python-urllib-urllib2-httplib-confusion

On Nov 4, 10:23 am, LB22 <latn.bl...@googlemail.com> wrote:
> Hi,
>
> OK to be a little less ambiguous (apologies for that), the redirects
> of the urls I'm probing happen within scripts, like those used in
> affiliate links, or url shorteners. But it just so happens that when
> say a user clicks a link, they don't only get redirected from point A
> to point B, but actually get sent through point A.1, point A.2, and
> then point A.3.
>
> The purpose of this is to gather the domains to determine which ones
> to add to a whitelist.
>
> Thanks
>
> On Nov 4, 4:05 pm, mdipierro <mdipie...@cs.depaul.edu> wrote:
>
> > what do you mean by "masked". Do you have to parse pages or is this
> > done via HTTP 303/307?
>
> > On Nov 4, 9:54 am, LB22 <latn.bl...@googlemail.com> wrote:
>
> > > Hi Everyone,
>
> > > I'm not sure this is strictly a web2py question, but I figured I'd
> > > pose the question anyway, so here it goes.
>
> > > I had a task of going through several hundred urls to find out where
> > > they lead, so I used URLLIB2 in a web2py app to get and display the
> > > end destinations of the "masked" links. This part was easy.
>
> > > The problem is that many of the links hop through more than one URL
> > > before reaching the destination. So now I'm trying to retrieve the
> > > URLs that are in the redirect chain. I'm not quite sure how to do
> > > this.
>
> > > In a nutshell, I want to get each requested URL in the journey to the
> > > end URL, given the start URL.
>
> > > Does anyone know how to achieve this?
>
> > > Thanks
>
> > > LB22
>
>
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