如何在ajax调用中调试URL？

is there any way to debug mistakes as misspelling URL in datatype as in the code:

$.ajax({beforeSend:function (XMLHttpRequest) {}, complete:function (XMLHttpRequest, textStatus) {}, 
                type: "POST", 
                data: ajaxPostData,
                dataType:"html", evalScripts:true, success:function (data, textStatus) {update(data)}, url: **HERE WAS A BUG**

PS. I use firebug and firephp