R devel - Mar 2011 - use scan("http://www.example.com/file.htm") with an hidden-fake IP adress

Dear users,
I am currently using scan(,what="character") to read - automacally -
some
html pages,
I was wondering if there was an option to "hide" my IP-adress, or to
use a
"fake" one ?
I would like to chek if the website is using my IP-adress to change the
content of the page (it is the price of airline tickets actually)
I want to see if it is possible to do a request with some fake IP, to
compare the prices,
thanks for your help

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On Mar 28, 2011, at 2:24 PM, Arthur Charpentier wrote:
> Dear users,
> I am currently using scan(,what="character") to read -
automacally - some
> html pages,
> I was wondering if there was an option to "hide" my IP-adress, or
to use a
> "fake" one ?
> I would like to chek if the website is using my IP-adress to change the
> content of the page (it is the price of airline tickets actually)
> I want to see if it is possible to do a request with some fake IP, to
> compare the prices,
> thanks for your help
> 
You can't really change the IP address since that is where the server sends
the result. That's why your request packet has your IP so the response can
be delivered back to you. Obviously, you won't get anything if the IP
doesn't match. The only way to make requests to a server from a different IP
is to use another machine that has a different IP (e.g., a proxy server).

Cheers,
Simon