http://www.xav.com/perl/site/lib/LWP.html : perl module for writing WWW requests http://www.cis.ohio-state.edu/cgi-bin/rfc/rfc2068.html : the RFC info for HTTP Headers http://hotwired.lycos.com/webmonkey/99/36/index3a.html?tw=backend : article on http headers Unfortunately you haven't given much info as to what you are trying, other than you need to fool a server into thinking that you are not from New Zealand which sounds more like an IP spoof than a HTTP header alteration. An anonymous proxy would be your best bet given the (limited) information about your "challenge". It sounds interesting, but that's my overbounding curiosity kicking in. If you can share more info about what you need to do (in specific terms such as what they are looking for) I'd love to help. -benjamin