"What is the correct way to transfer the filter array and its value to the request, can you give an example?"

description=descr&filter%5B0%5D%5Bfilterid%5D=1&filter%5B0%5D%5Bfiltervalue%5D=%D0%97%D0%BD%D0%B0%D1%87%D0%B5%D0%BD%D0%B8 %D0%B5+1&filter%5B1%5D%5Bfilterid%5D=2&filter%5B1%5D%5Bfiltervalue%5D=%D0%97%D0%BD%D0%B0%D1%87%D0%B5%D0%BD% D0%B8%D0%B5+2
if you write in php something like this:
$productInfo = array(
'description' => 'descr',
'filter' => array(
array('filterid' => 1, 'filtervalue' => 'Value 1'),
array('filterid' => 2, 'filtervalue' => 'Value 2')
),
);
$query = http_build_query($productInfo);