test.php [ example code ]
<?php // 4 or greater
$loop = ''; // created to generate a big output for this test and its preload
for($a = 0; $a < 5000; $a++) {
	$loop .= "{$a}__ajijdjajajoiasjoij\n";
}
$var = isset($_REQUEST['something']) ? urlencode($_REQUEST['something']) : 'nothing';
$output = '&variable0=hello world&variable1='.$var.'&'.$loop;
header('Content-Length: '.strlen($output)); // really important !!!
echo $output;
?>

		
  NOTE: look at this page source code to view JS and preload example.