ajax 请求失败，我不知道为什么

出于某种非常奇怪的原因，我的ajax请求一直作为错误返回，但是数据确实被添加到数据库中。在控制台中，它只是显示了一大堆关于我何时记录错误的内容，我无法理解它到底来自哪里。所有的php/html/命名都是正确的，因为这曾经有效，但是我不明白为什么会发生这种情况。

法典：

function doShorten(event)
 {
event.preventDefault();
var form_data = {
    long_url : $("[name='long_url']").val()
};
$.ajax({
    type: "POST",
    url: "url/short_ajax",
    data: form_data,
    dataType: "json",
    timeout: 10000,
    beforeSend: function() {
        console.log("About to send");
    },
    complete: function() {
        console.log("Complete", this.url);
    },
    success: function(data){
        console.log("Success", this.url);
        $('#shorty').addClass('shorty').html("Short URL: "+data);
    },
    error: function(error) {
        console.log("Error", this.url, error);
    }
});
}

请帮忙！

Stuff I get in the console:
    abort: function (a){a=a||"abort",p&&p.abort(a),w(0,a);return this}
always: function (){i.done.apply(i,arguments).fail.apply(i,arguments);return this}
complete: function (){if(c){var a=c.length;n(arguments),j?l=c.length:e&&e!==!0&&(k=a,o(e[0],e[1]))}return this}
done: function (){if(c){var a=c.length;n(arguments),j?l=c.length:e&&e!==!0&&(k=a,o(e[0],e[1]))}return this}
error: function (){if(c){var a=c.length;n(arguments),j?l=c.length:e&&e!==!0&&(k=a,o(e[0],e[1]))}return this}
fail: function (){if(c){var a=c.length;n(arguments),j?l=c.length:e&&e!==!0&&(k=a,o(e[0],e[1]))}return this}
getAllResponseHeaders: function (){return s===2?n:null}
getResponseHeader: function (a){var c;if(s===2){if(!o){o={};while(c=bG.exec(n))o[c[1].toLowerCase()]=c[2]}c=o[a.toLowerCase()]}return c===b?null:c}
isRejected: function (){return!!i}
isResolved: function (){return!!i}
overrideMimeType: function (a){s||(d.mimeType=a);return this}
pipe: function (a,b,c){return f.Deferred(function(d){f.each({done:[a,"resolve"],fail:[b,"reject"],progress:[c,"notify"]},function(a,b){var c=b[0],e=b[1],g;f.isFunction(c)?i[a](function(){g=c.apply(this,arguments),g&&f.isFunction(g.promise)?g.promise().then(d.resolve,d.reject,d.notify):d[e+"With"](this===i?d:this,[g])}):i[a](d[e])})}).promise()}
progress: function (){if(c){var a=c.length;n(arguments),j?l=c.length:e&&e!==!0&&(k=a,o(e[0],e[1]))}return this}
promise: function (a){if(a==null)a=h;else for(var b in h)a[b]=h[b];return a}
readyState: 4
responseText: "http://localhost/u/pRam"
setRequestHeader: function (a,b){if(!s){var c=a.toLowerCase();a=m[c]=m[c]||a,l[a]=b}return this}
state: function (){return e}
status: 200
statusCode: function (a){if(a){var b;if(s<2)for(b in a)j[b]=[j[b],a[b]];else    b=a[v.status],v.then(b,b)}return this}
statusText: "OK"
success: function (){if(c){var a=c.length;n(arguments),j?l=c.length:e&&e!==!0&&(k=a,o(e[0],e[1]))}return this}
then: function (a,b,c){i.done(a).fail(b).progress(c);return this}
__proto__: Object