I am trying to use json data as parameters in a mysql store procedure. I am getting a 502 error when i send my post to my perl script. If I manually enter the parameters in my script it works, so i have narrowed down my issue to $sth->execute($input->{to}, $input->{from}, $input->{id}, $input->{body});

use strict;
use warnings;

#
# need CGI, JSON,
# MIME::LITE for email,
# and DBI/DBD::mysql for DB operations.
#
use CGI ();
use JSON ();
use DBI;
use DBD::mysql;
use MIME::Lite;

#
# Declare variables
#
my ($status, $email, $input);

my $q = CGI->new;
my $json = JSON->new->utf8;
if ($q->param('POSTDATA')) {
   $input = $json->decode( $q->param('POSTDATA') );
} else {
   &SimpleJSONResponse("error","no JSON data found");
   exit(0);
}

#
# test that all sms values exist
# if not, return error
#

unless (($input->{to}) && ($input->{from}) && ($input->{body}) && ($in
+put->{id})) {
   #
   # if we don't get the required fields from flowroute,
   # return an error
   #
   &SimpleJSONResponse("error","required fields not present");
} else {
   #
   # we received the required fields from flowroute
   # connect to database
   #
   my $data_source = "DBI:mysql:database=flowroute;host=localhost";
   my $user = "user";
   my $password = "password";
   my $dbh = DBI->connect($data_source, $user, $password) or die &Simp
+leJSONResponse("error","cannot connect to db");
  
   #
   # run stored procedure add_sms
   # stores sms to database and returns the email address
   #
   my $sql = "call add_sms(?, ?, ?, ?)";
   my $sth = $dbh->prepare($sql) or die &SimpleJSONResponse("error","c
+annot prepare sql");
   $sth->execute($input->{to}, $input->{from}, $input->{id}, $input->{
+body});

   }

#
# Subroutines
#
sub SimpleJSONResponse() {
   my($key, $value) = @_;
   print $q->header(-type => "application/json", -charset => "utf-8");
   print $json->encode({ $key => $value });
}
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