jQuery $.post fails in Chrome with data not empty. NETWORK_ERR: XMLHttpRequest Exception 101

Question

Here is the code:

$.ajaxSetup({async:false});
$.post('/save/', {a : '1'}, function(res){
        $('#random').html(res);
    }, 'text'
).error(function(jqxhr, status, err){
    $('#random').html(err);
});

In Chrome, sometimes return "Error: NETWORK_ERR: XMLHttpRequest Exception 101", However, sometimes are OK.

If I use empty data, like {}
or []
or ""

it always works, and in Firefox 5, it also seems to always work!

I tried different data format, like ({data: '111'}) and simply string "&a=1&b=2&c=3", but still the same thing.

My backend is kind of simply:

@csrf_exempt
def save(request):
    if request.is_ajax():
        if request.method == 'POST':
            message = 'POST' + str(datetime.utcnow())
        else:
            message = 'GET'
    else:
        message = 'NOT AJAX CALL'

    return HttpResponse(message)

• Webserver is Django's local development server (manange.py runserver 8000)
• My chrome is 14.0.797.0
• My jQuery is 1.6.1
• Windows XP
• Python2.5

additional info: In fiddler, the response error is:

ReadResponse() failed: The server did not return a response for this request.