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我使用FeedEk的jQuery插件，它使用YQL API，嘗試和顯示器有3個RSS提要。的jQuery與YQL RSS訂閱隨機返回null
大多數時候事情都很好，但每過一段時間，我都會從三種飼料中的一種獲得results: null，但通常是第二種和第三種飼料，很少是第一種飼料。我檢查了飼料本身和他們沒有表現出任何的問題，我也測試了它在雅虎控制檯，它不顯示的問題。 這不是一個呼叫限制問題，因爲我幾乎沒有打300電話從我的IP，同時測試了一天。
我啓用的診斷，我可以看到的唯一的事情是不同與result: null飼料是它在info部分下面的消息Using encoding from response content-type header (UTF-8) as XML document does not specify encoding.
下面是我在做
SELECT channel.item FROM feednormalizer WHERE output="rss_2.0" AND url ="http://feeds.arstechnica.com/arstechnica/index" LIMIT 8
這裏是插件代碼
/*
* FeedEk jQuery RSS/ATOM Feed Plugin v3.0 with YQL API (Engin KIZIL http://www.enginkizil.com)
* http://jquery-plugins.net/FeedEk/FeedEk.html https://github.com/enginkizil/FeedEk
* Author : Engin KIZIL http://www.enginkizil.com
*/
(function ($) {
$.fn.FeedEk = function (opt) {
var def = $.extend({
MaxCount: 5,
ShowDesc: true,
ShowPubDate: true,
DescCharacterLimit: 0,
TitleLinkTarget: "_blank",
DateFormat: "",
DateFormatLang:"en"
}, opt);
var id = $(this).attr("id"), i, s = "", dt;
$("#" + id).empty();
if (def.FeedUrl == undefined) return;
$("#" + id).append('<div style="width:100%;text-align:center;color:#424242;"><div class="loader"></div></div>');
var YQLstr = 'SELECT channel.item FROM feednormalizer WHERE output="rss_2.0" AND url ="' + def.FeedUrl + '" LIMIT ' + def.MaxCount;
$.ajax({
url: "https://query.yahooapis.com/v1/public/yql?q=" + encodeURIComponent(YQLstr) + "&format=json&diagnostics=true&callback=?",
dataType: "json",
success: function (data) {
$("#" + id).empty();
if (!(data.query.results.rss instanceof Array)) {
data.query.results.rss = [data.query.results.rss];
}
$.each(data.query.results.rss, function (e, itm) {
s += '<li><div class="itemTitle">' + itm.channel.item.title + '</div>';
if (def.ShowPubDate){
dt = new Date(itm.channel.item.pubDate);
s += '<div class="itemDate">';
if ($.trim(def.DateFormat).length > 0) {
try {
moment.lang(def.DateFormatLang);
s += moment(dt).format(def.DateFormat);
}
catch (e){s += dt.toLocaleDateString();}
}
else {
s += dt.toLocaleDateString();
}
s += '</div>';
}
if (def.ShowDesc) {
s += '<div class="itemContent">';
if (def.DescCharacterLimit > 0 && itm.channel.item.description.length > def.DescCharacterLimit) {
s += itm.channel.item.description.substring(0, def.DescCharacterLimit) + '...';
}
else {
s += itm.channel.item.description;
}
s += '</div>';
}
});
$("#" + id).append('<ul class="feedEkList">' + s + '</ul>');
}
});
};
})(jQuery);
最後從YQL返回的XML爲失敗結果
/**/
jQuery112204319277675822377_1459586267516({
"query": {
"count": 0,
"created": "2016-04-02T08:37:48Z",
"lang": "en-US",
"diagnostics": {
"publiclyCallable": "true",
"url": {
"execution-start-time": "1",
"execution-stop-time": "59",
"execution-time": "58",
"content": "http://feeds.arstechnica.com/arstechnica/index"
},
"info": "Using encoding from response content-type header (UTF-8) as XML document does not specify encoding.",
"user-time": "60",
"service-time": "58",
"build-version": "0.2.430"
},
"meta": {
"url": {
"id": "http://feeds.arstechnica.com/arstechnica/index",
"status": "200",
"headers": {
"header": [{
"name": "Content-Type",
"value": "text/xml; charset=UTF-8"
}, {
"name": "ETag",
"value": "m+oG6+UhrscSbLRLhGlL3lvlwNo"
}, {
"name": "Last-Modified",
"value": "Sat, 02 Apr 2016 07:32:51 GMT"
}, {
"name": "Content-Encoding",
"value": "gzip"
}, {
"name": "Expires",
"value": "Sat, 02 Apr 2016 07:40:36 GMT"
}, {
"name": "Cache-Control",
"value": "private, max-age=0"
}, {
"name": "X-Content-Type-Options",
"value": "nosniff"
}, {
"name": "X-XSS-Protection",
"value": "1; mode=block"
}, {
"name": "Server",
"value": "ATS"
}, {
"name": "Date",
"value": "Sat, 02 Apr 2016 08:37:48 GMT"
}, {
"name": "Age",
"value": "0"
}, {
"name": "Connection",
"value": "close"
}, {
"name": "Via",
"value": "http/1.1 ec2.ycs.bf1.yahoo.net (ApacheTrafficServer [cSsNfU])"
}
]
}
}
},
"results": null
}
});