You'll want to connect to the IP address, but set the Host header to the host (e.g. www.example.com). Assuming you're using LWP, it might look like this:

Here, $url contains the full URL, where you can use the IP or any hostname that resolves to the correct IP, and $host contains the hostname you actually want to go to.

Hope this helps!

When I read your post you seem to be asking, "I want to test many IP addresses for a URL (or URI)" because you were thinking you could accomplish this by just editing the /etc/hosts file and then test. If I've read you're problem correctly then something like this would work or get you started.

#!/usr/bin/perl 
use strict;
use warnings;
use LWP::Simple;

my @IP = qw/ 192.168.1.1 192.168.1.2/;
my $url = '/home/index.html';

foreach (@IP) {
    print "TESTING: $_$url\n";
    my $reply = get("http://$_$url");
    #test reply here, etc...
    
}
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I would probably put all of my IPs in a file:

192.168.1.1

192.168.1.2

etc ...

and call it ip.txt

#!/usr/bin/perl 
# test_url.pl
use strict;
use warnings;
use LWP::Simple;
my $ip="";

my $url = '/home/index.html';

while(defined($ip=<STDIN>)) {
 my $reply = get("http://$ip$url");
 warn "couldn't get $ip$url\n" unless defined $reply;
}
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and then cat ip.txt | test_url.pl Something like this... Good luck, Rob

I think you may have it backwards; the poster has one IP, but many hostnames.

I got Kung-Fu'd. I was trying to help but got flipped into learning that the URL can be the same IP but derivate based on hostname after reading this statement. **bows humbly, Rob

Try to set the target IP address as proxy server for LWP:

my $ua = LWP::UserAgent->new;
$ua->proxy('http', 'http://192.168.12.34:80/');
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Communication with proxy servers is slightly different from "plain" HTTP communication (mostly: the URL is part of the GET/POST request, not only the path part), but I didn't find a webserver not supporting this.