Parsing error when parsing the second time

I'm trying to use APR::Request outside of Apache to parse application/ 
x-www-form-urlencoded POST data.  I'm using libapreq2-2.08.

I have some working code mostly taken from the libapreq2 tests, but  
I'm running into an issue where the second time I try to parse  
something, nothing is parsed.  The code I'm using is below along with  
the output.  Is there something I'm forgetting to reset before  
calling the function a second time?

#!/usr/bin/perl

use strict;
use warnings;

use APR::Pool;
use APR::Brigade;
use APR::Bucket;
use APR::BucketAlloc;
use APR::Request;
use APR::Request::Parser;

urlencoded();
urlencoded();

sub urlencoded {
     my $pool = APR::Pool->new;
     my $ba   = APR::BucketAlloc->new($pool);
     my $bb   = APR::Brigade->new($pool, $ba);

     my $buf = 'a=1&b=2';
     $bb->insert_tail(
         APR::Bucket->new( $ba, $buf )
     );

     warn "Parsing $buf\n";

     my $parser = APR::Request::Parser->urlencoded(
         $pool,
         $ba,
         'application/x-www-form-urlencoded',
     );

     my $req = APR::Request::Custom->handle(
         $pool,
         '',
         '',
         $parser,
         7,
         $bb,
     );

     my $table = $req->param;
     $table->do( sub {
         my ( $key, $value ) = @_;
         warn "$key => $value\n";
     } );
}

----

Output:

Parsing a=1&b=2
a => 1
b => 2
Parsing a=1&b=2

--
Andy Grundman
[email protected]