[jQuery] getJSON not triggering success callback

[jQuery] getJSON not triggering success callback

I'm making some calls with getJSON on another domain, and the callback is not firing.
My code is the next:
<div style="margin-left: 40px;"><font size="1">var url = '<a href="http://localhost:8080/cometd/cometd?message=%7B%22version%22%3A%221.0%22%2C%22minimumVersion%22%3A%220.9%22%2C%22channel%22%3A%22%2Fmeta%2Fhandshake%22%2C%22id%22%3A0%2C%22connectionType%22%3A%22callback-polling%22%7D">http://localhost:8080/cometd/cometd?message=%7B%22version%22%3A%221.0%22%2C%22minimumVersion%22%3A%220.9%22%2C%22channel%22%3A%22%2Fmeta%2Fhandshake%22%2C%22id%22%3A0%2C%22connectionType%22%3A%22callback-polling%22%7D</a>'
$.getJSON(url + '&jsoncallback=?', function() {
console.log(arguments)
})
</font></div>
And this is the response I get in the added script tag
<div style="margin-left: 40px;"><font size="1"><span class="sourceRowText">[{"id":"0","minimumVersion":"0.9","supportedConnectionTypes":["long-polling","callback-polling"],"successful":true,"channel":"/meta/handshake","advice":{"reconnect":"retry","interval":0,"timeout":120000},"clientId":"fzmfrqm3f99vdrhow","version":"1.0"}]</span></font>
</div><font size="2">
Somebody can help me with this?
Thanks.
</font>