Sanjay Uttam

Just ran into this one.  The following is the code I was working with:

$.ajax({
            type: "GET",
            url: 'http://services.somewhere.com/MethodName',
            data: { 'param1':'something', 'param2': 'somethingElse' },
            cache: false,
            dataType: 'json',
            success: function(view) {
                alert('success');
            },
            error: function(xhr, ajaxOptions, thrownError) {
                alert(xhr.status);
                alert(xhr.responseText);
                alert(xhr.statusText);
            }
        });

This worked in IE 8, but not FF 3.5.  The strange part, though, was that the xhr object in my error function didn't even contain anything in FF, whereas when I intentionally made the service fail in my IE testing my error object contained the server response.  Turns out the fix was changing dataType to 'jsonp' instead of 'json'.  I also added the contentType based on this post.  More on jsonp...

$.ajax({
            type: "GET",
            url: 'http://services.somewhere.com/MethodName',
            data: { 'param1':'something', 'param2': 'somethingElse' },
            cache: false,
            dataType: 'jsonp',
            contentType: "application/json; charset=utf-8",
            success: function(view) {
                alert('success');
            },
            error: function(xhr, ajaxOptions, thrownError) {
                alert(xhr.status);
                alert(xhr.responseText);
                alert(xhr.statusText);
            }
        });