always 403 forbiden for json package,@csrf_exempt do not wrok

[thinksource]

Hi, I want to send an ajax request: by $.post javascript code： data='{"jsonrpc": "2.0", "method": "secret", "params": {"a": "as12"}, "id": 1}' $.post( 'RPC2', data, function(data1) { alert("Response: " + data1); } );

the python receive code: @csrf_exempt @jsonrpc_method('app.addStrings(arg1=String) -> String', validate=True) def add(request, secret_data):

print request.COOKIES
print request.body
re=request.REQUEST
print repr(re)

result=0;
for k in re:
    print "dict[%s] =" % k,re[k]
rep = re.get('params', None)
print rep
return HttpResponse(json.dumps({'message':'Hello World'}), content_type="application/json")

but I get the 403 Forbiden as CSRF problem. I think I have already writen @csrf_exempt, but it don't work.