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[ 'field1' => '1', 'field2{subfield1]' => 'x', ... 'field3{subfield3]' => 'int', 'field3{subfield4}' => 'string', ]
#!/usr/bin/perl -- use strict; use warnings; ... field1=1&field2%5B0%5D%5Bsubfield1%5D=x&field2%5B0%5D%5Bsubfield2%5D=y +&field3%5Bsubfield3%5D=int&field3%5Bsubfield4%5D=string