Instead of system + redirection of output + reading text file, you could use backticks:
$text = `gethttp.exe http://www.blahblahblah.com"`;

But why don't you use the LWP library of modules instead of gethttp.exe. LWP comes with Perl and it's a tried and true way of getting web pages. LWP::Simple makes it extremely simple too.
use LWP::Simple;
$text = get("http://www.blahblahblah.com/")
or die(...);

If you want to split the text into lines:
@array = $text =~ /([^\n]*\n)/g;