I do it all the time. As long as you are connecting to the same server that 
you loaded the page from, then you are all set. This is how I normally make 
JSON requests:

var url = '{{=URL('some.json')}}/';
jQuery.getJSON(url).success(function(data) {
    // finished successfully
    alert(data);
}).fail(function(err) {
    // ajax failed
    alert(err);
});

There are many ways to do this, but this one seems to be the most robust 
for me, as it can catch connection and server errors.

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