jQuery AJAX GET / POST请求在错误处理程序中返回404，但是从服务器发送了有效响应

The Problem: I send GET or POST request with jQuery.ajax and get an error handler triggered with 404. The thing is, I have used a sniffer to check an answer from server and it is a valid 200 response with a correct JSON (returned by Python json.dumps). And something weird: after this call ends up with 404 a browser reloads the page. The Problem: I send GET or POST request with jQ