why ajax callback error method?

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本文深入探讨了在Ajax请求返回200状态码时，为何错误回调函数仍然被调用的原因，分析了可能存在的问题，并提供了解决方案。

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I have the following ajax request:

	jQuery.ajax({
			async: true,
			type: "GET",
			url: url,
			data: data,
			dataType: "json",
			success: function(results){
				currentData = results;
			},
			error: function(xhr, ajaxOptions, thrownError){
				if (xhr.status == 200) {
					console.debug("Error code 200");
				}
				else {
					currentData = {};
					displayAjaxError(xhr.status);
				}
			}
		});

For some reason the error callback is called event though the http status code is 200 ie. the request is OK. Why is this?

http://en.wikipedia.org/wiki/List_of_HTTP_status_codes

answer:

The problem might be that the json data returned from the url is malformed. When the server actually returns something, the http status code is 200. But that doesn't mean that the data is proper json. Check that the stringified json data returned is correctly formed