How to get a json response from yaler

I create an account with yaler, to comunicate with my arduino yun. It works fine, and i'm able to switch on and off my leds. Then i created a web page, with a button that calls an ajax function with GET method to yaler (yaler web server accept REST style on the URL)

$.ajax({
   url: "http://RELAY_DOMAIN.try.yaler.net/arduino/digital/13/1",
   dataType: "json",
   success: function(msg){
      var jsonStr = msg;
    },
   error: function(err){
       alert(err.responseText);
   }

});

This code seem to work fine, infact the led switches off and on, but i expect a json response in success function (msg) like this:

{
"command":"digital",
"pin":13,
"value":1,
"action":"write"
}

But i get an error (error function). I also tried to alert the err.responseText, but it is undefined....

How could i solve the issue? Any suggestions??? Thanks in advance....

Solution

If the Web page containing the above Ajax request is served from a different origin, you'll have to work around the same origin policy of your Web browser.

There are two ways to do this (based on http://forum.arduino.cc/index.php?topic=304804):

CORS, i.e. adding the header Access-Control-Allow-Origin: * to the Yun Web service
JSONP, i.e. getting the Yun to serve an additional JS function if requested by the Ajax call with a query parameter ?callback=?

CORS can probably be configured in the OpenWRT part of the Yun, while JSONP could be added to the Brige.ino code (which you seem to be using).