Not Acceptable! An appropriate representation of the requested resource could not be

<a href="<?=base_url()?>controller/controller_method/<?=$l1."/".$l2?>"> will output? What is $l1 value? Maybe you URL character is disallowed by codeigniter.

$l1 contains id i.e. 2 and $l2 contains name with space between them i have checked disallowed character but it is not working. Please give any suggestion.