package MyApache2::InputRequestFilterLC;
  
  use strict;
  use warnings;
  
  use base qw(Apache2::Filter);
  
  use Apache2::Connection ();
  use APR::Brigade ();
  use APR::Bucket ();
  
  use Apache2::Const -compile => 'OK';
  use APR::Const     -compile => ':common';
  
  sub handler : FilterRequestHandler {
      my ($f, $bb, $mode, $block, $readbytes) = @_;
  
      my $c = $f->c;
      my $bb_ctx = APR::Brigade->new($c->pool, $c->bucket_alloc);
      my $rv = $f->next->get_brigade($bb_ctx, $mode, $block, $readbytes);
      return $rv unless $rv == APR::Const::SUCCESS;
  
      while (!$bb_ctx->is_empty) {
          my $b = $bb_ctx->first;
  
          if ($b->is_eos) {
              $bb->insert_tail($b);
              last;
          }
  
          my $len = $b->read(my $data);
          $b = APR::Bucket->new($bb->bucket_alloc, lc $data) if $len;
  
          $b->remove;
          $bb->insert_tail($b);
      }
  
      return Apache2::Const::OK;
  }
  
  1;