use strict;
use Encode;      # I'm getting utf8 data
use LWP::Simple;
use Text::xSV;

my $fh;
my $csv_url = "http://someplace/that/sends/data.csv";

my $content = decode( 'utf8', get( $csv_url ));

# HERE IS THE BLANK TO FILL IN:
# associate $fh (as file handle) with $content (as file data)
# then:

my $csv = Text::xSV( fh => $fh );  # or something like that(?)

$csv->read_header;
while ( $csv->get_row ) {
   # and so on
}