use libapreq2 to read POST params

Hi,
I'm trying to use libapreq2 to read some parameters submitted via  
POST, but I'm having trouble.  Should I use $req->body($myparam) ? or  
$req->param($myparam)?


My code looks like this:

         $r->log->debug("Testing param");
         my ($md5, $entered);
         eval { $md5 = $req->param('cv'); } ;
         if($@)
         {
             use Data::Dumper;
             $r->log->error("ACK: no cv param: " . $@->strerror() . "  
-- " . Dumper($@));
             return $class->handle_get($r, $Site, $req,
                                     'The code entered was not  
valid.<br>Please try again.');
         }
         $r->log->debug("For cv got... $md5");


The error log shows the following:

[Fri Sep 22 10:59:56 2006] [debug] /Users/dviner/Documents/amb/dev/ 
aboutmybaby/AMB/Handlers/GuestbookSign.pm(57): [client 127.0.0.1]  
Testing param
[Fri Sep 22 10:59:56 2006] [debug] filter.c(269): [client 127.0.0.1]  
prefetching 65536 bytes
Use of uninitialized value in concatenation (.) or string at /Users/ 
dviner/Documents/amb/dev/aboutmybaby/AMB/Handlers/GuestbookSign.pm  
line 67.
[Fri Sep 22 10:59:56 2006] [debug] /Users/dviner/Documents/amb/dev/ 
aboutmybaby/AMB/Handlers/GuestbookSign.pm(67): [client 127.0.0.1] For  
cv got...


The request I sent is as follows:

$ cat sign.params | lwp-request -m POST -SUsue "http:// 
lalala.aboutmybaby.localhost/guestbook/sign"
$ cat sign.params
gbentry_from=hithere&gbentry_body=foobar&cv=1111111&cg=abcdef

$

Here are the details of my installation:

[Fri Sep 22 10:59:55 2006] [notice] Apache/2.0.58 (Unix) PHP/5.1.4  
DAV/2 mod_apreq2-20051231/2.6.0 mod_perl/2.0.2 Perl/v5.8.8 configured  
-- resuming normal operations


Thanks for your help.
Dave Viner