What you are trying to do with this code doesn't make any sense, for a number of reasons.

• you are attempting to set authorization information on a request that you have already sent to the server.
• You are sleeping for no apparent reason
• $content = s/202.36.7.8/202.36.7.8/; doesn't even come close to doing what you are attempting to do (in fact it doesn't do much of anything).
• $response->$content also doesn't do anything.

From your description of what you are trying to do, and your code, I'm guessing you are attempting to configure a router or a wireless access point or something like that with a web interface. In that case you need to step back and think about exactly what it is you are trying to achieve. I would guess it goes something like this:

• Request http://192.168.1.1/ with basic authentication
• Navigate to the form that contains the ip address
• Change the value of the IP address in the form
• Submit the form

If that is the case, you probably want to start with WWW::Mechanize, which is designed for exactly this sort of applications. In order to use it you would do something like this:

use strict; # <- always start with this
use warnings; # <- this is good too
use WWW::Mechanize;

my $mech = WWW::Mechanize->new();
$mech->credentials( 'admin', 'password' );
$mech->get( 'http://192.168.1.1/' );
$mech->follow_link( test_regex => qr/configuration/ );
$mech->submit_form(
    form_number => 1,
    fields => {
        ip_address => '202.36.7.8',
    },
);
[download]

Of course you will have to adjust this to suit the actual interface you are attempting to interact with.