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while( !$found && defined( my $log_line = $bw->readline ) ) {
  if ($log_line =~ /GET \/myapp\//) {
...
    $bw->close();
  }
}

while(defined( my $log_line = $bw->readline ) ) {
  if ($log_line =~ /GET \/myapp\//) {
...
  }
}
$bw->close();