http://stackoverflow.com/questions/22448574/need-suggestion-in-tricky-form-post-data-in-a-page-using-perl

I am trying to Post and get some response data, but i am getting the same data as response even after changing the data values in the post request. i am in need of some suggestion , this is what i have tried

use strict;
use warnings;
use LWP::UserAgent;
use WWW::Mechanize;
my $mech=WWW::Mechanize->new();
my $ua = LWP::UserAgent->new;
my $server_endpoint ='http://www.dartsmad.com/dartabase/darts_player_h
+ead_to_head.aspx';



$mech->get($server_endpoint);
my $content=$mech->content();
my $eventtarget='';
my $eventargument='';
my $lastfocus='';
my $viewstate='';
my $validation='';
if($content=~m/id="__EVENTTARGET"\s*value="([^"]*?)"/is){$eventtarget=
+$1;print $1."\n\n\n\n\n\n __EVENTTARGET";sleep 2;}
if($content=~m/id="__EVENTARGUMENT"\s*value="([^"]*?)"/is){$eventargum
+ent=$1;print $1."\n\n\n\n\n\n __EVENTARGUMENT";sleep 2;}
if($content=~m/id="__LASTFOCUS"\s*value="([^"]*?)"/is){$lastfocus=$1;p
+rint $1."\n\n\n\n\n\n __LASTFOCUS";sleep 2;}
if($content=~m/id="__VIEWSTATE"\s*value="([^"]*?)"/is){$viewstate=$1;p
+rint $1."\n\n\n\n\n\n view_state";sleep 2;}
if($content=~m/id="__EVENTVALIDATION"\s*value="([^"]*?)"/is){$validati
+on=$1;print $1."\n\n\n\n\n\n__EVENTVALIDATION";sleep 2;}

my $post_data = '{"__EVENTARGUMENT":'.$eventargument.',"__VIEWSTATE":'
+.$viewstate.',"__EVENTTARGET":'.$eventtarget.',"__EVENTVALIDATION":'.
+$validation.',"__LASTFOCUS":'.$lastfocus.',"btnComparePlayers":"Compa
+re","ddlCompPlayerA":"246",ddlCompPlayerB:"259"}';
my $req = HTTP::Request->new(POST => $server_endpoint);
$req->header('Content-Type: application/x-www-form-urlencoded');
$req->content($post_data);
my $resp = $ua->request($req);
if ($resp->is_success) {
    my $message = $resp->decoded_content;
    print "Received reply: $message\n";
    open(FH,">txk.html");
    print  FH $message;
    close FH;
}
else {
    print "HTTP POST error code: ", $resp->code, "\n";
    print "HTTP POST error message: ", $resp->message, "\n";
}
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