PHP cross-reference request with blocking

just wanted to find a solution to this. I am in system A and I make the following call

$("#page-form").submit(function(event){
      $.ajax({
          type: "POST",
          url: "https://someOtherUrl/process.php",
          data: {
              'mobNumber': $("#mobile").val()
          }
      }).done(function (response) {
              alert(response);
          });       
  })

      

        
        
        
      

    

This now calls the PHP file on another server. This PHP file does nothing at the moment, I just

<?php

header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Methods: PUT, GET, POST");
header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept");

var_dump("1");

      

        
        
        
      

    

However, I am getting an error with a cross-reference request. Why is this happening?

As a side note, I don't have access to the server that System A is running on, so this must be done on my server where the PHP file resides.

thank

Update

Server seems to have this Response Headers

Cache-Control   no-cache
Connection  Keep-Alive
Content-Type text/html; charset=utf-8
Date    Thu, 25 Jun 2015 12:31:50 GMT
Expires Thu, 25 Jun 2015 12:31:50 GMT
Keep-Alive  timeout=5, max=99
Pragma  no-cache
Server  Apache
Transfer-Encoding  chunked
Vary  Accept-Encoding
x-ua-compatible IE=edge

      

        
        
        
      

    

Request headers

Accept  text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding gzip, deflate
Accept-Language en-US,en;q=0.5
Connection  keep-alive
User-Agent  
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0