XMLHttpRequest POST Minimal Example

XMLHttpRequest_post.js

SimpleRequest = {
    call: function(what, response) {
      var request;
      if (window.XMLHttpRequest) {
        request = new XMLHttpRequest();
      } else if (window.ActiveXObject) {
        try {
          request = new ActiveXObject('Msxml2.XMLHTTP');
        } catch (e) {
          try {
            request = new ActiveXObject('Microsoft.XMLHTTP');
          } catch (e) {}
        }
      }
      request.onreadystatechange = function() {
        if (request.readyState === 4) {
          if (request.status === 200) {
            response(request.responseText)
          } else response();
        }
      }
      request.open('POST', what, true);
      var body={
      }
      request.send(JSON.stringify(body));
      request.setRequestHeader("Content-Type", "application/json");
    }
  }

SimpleRequest.call('http://posttestserver.com/post.php', function(result) {
  console.log("Response", result);
})