Perl HTTP :: Request Put – >方法不允许

use LWP::UserAgent;
use HTTP::Request::Common;
my $ua = LWP::UserAgent->new;

my $req = HTTP::Request::Common::PUT("http://xxx:yyy/...");
$req->header('content-type' => 'application/json');
$req->authorization_basic('abc','xyz');

my $put_data = '{
        "description" : "TestPut"   
    }';
$req->content($put_data);

my $resp = $ua->request($req);
if ($resp->is_success){
    print $resp->content() . "n";
}
else{
    print "PUT failed:n";
    print $resp->message . "n";
}

但我得到一个“方法不允许”的消息.
GET工作正常.
这可能是Http-Server(Tomcat)还是防火墙的问题？

$req-> as_string：

PUT #URL 
Authorization: Basic xxx= 
Content-Type: application/json 

{ 
           "description" : "TestPut"
           }