No Access-Control-Allow-Origin header is present on the requested resource

Question

I want to access information from same domain but with different port number, To allow this I am adding Access-Control-Allow-Origin with the response header.

Answer 1

You are missing 'json' dataType in the $.post() method:

$.post('http://www.example.com:PORT_NUMBER/MYSERVLET',{MyParam: 'value'})
        .done(function(data){
                  alert(data);
         }, "json");
         //-^^^^^^-------here

---

Updates:

try with this:

response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));

---