#!/usr/bin/perl
use CGI::Carp qw(warningsToBrowser fatalsToBrowser);
use JSON::RPC::Server::CGI;
use strict;
use Data::Dumper;
my $server = JSON::RPC::Server::CGI->new;

$server->dispatch('Myapp')->handle();
The Myapp.pm is

#!/usr/bin/perl
package Myapp;
use base qw(JSON::RPC::Procedure); # Perl 5.6 or more than
use strict;
use Data::Dumper;
sub test : Public(u1:str){
        my ($s, $obj) = @_;
        my $u1 = $obj->{u1};
        return $u1;
}
1;