huge chars data is not going through ajax call and I can able to see the chars in request body in browsers debug tools. If I send few chars I can able to receive it in server side!!

ajax call :

1. jQuery.ajax({
2.         url : "/RegisterServlet_2/servlet/Register",
3.         type : "POST",
4.         data: "img="+compressed,
5.         cache : false,
6.         async : false,
7.         success : function()
8.         {
9.         },
10.         error : function()
11.         {
12.         }
13.     });

Fyi, I don't want to send as json object. I just want to send as string only! Any way out? Thanks in advance.