javascript - Access-Control-Allow-Origin不允许使用Origin http://127.0.0.1

Question

我正在制作一个简单的图库,用html + javascript从picasa帐户拍摄照片.

首先,获取专辑列表,然后为每张专辑获取照片列表.第一个查询工作正常,但其他查询在浏览器(Chrome)中返回此错误:

获取https://picasaweb.google.com/data/entry/base/user/114476218463019618611/albumid/5750459375839674337?alt=json&hl=en_US 404(未找到)jquery.js:8240 XMLHttpRequest无法加载https://picasaweb.google .com/data/entry/base/user/114476218463019618611/albumid/5750459375839674337？alt = json&hl = en_US.原始文件:// Access-Control-Allow-Origin不允许.

这是代码:

           var json_Album_URI = "https://picasaweb.google.com/data/feed/base/"
                + "user/"       +   username
                + "?alt="       +   "json"
                + "&kind="      +   "album"
                + "&hl="        +   "en_US"
                + "&fields="    +   "entry(media:group,id)"
                + "&thumbsize=" +   104
                + "&authkey="   +   authkey;

            $.ajax({
                    type: 'GET',
                    url: json_Album_URI,
                    success : function(resp) {
                            albums = resp.feed.entry;
                    },
                    dataType: 'json',
                    async: false
            });
            for (var id in albums) {
                    var album = albums[id];
                    var album_ID = album.id.$t.split('/')[9].split('?')[0];
                    var json_Photo_URI = "https://picasaweb.google.com/data/feed/base/"
                            + "user/"       +   username
                            + "/albumid/"   +   album_ID
                            + "?alt="       +   "json"
                            + "&kind="      +   "photo"
                            + "&hl="        +   "en_US"
                            + "&fields="    +   "entry(media:group)"
                            + "&thumbsize=" +   104
                            + "&authkey="   +   authkey;
                    //this is the ajax call that fails
                    $.ajax( {
                            type: 'GET',
                            url: json_Photo_URI,
                            success: function(photos) {
                                    console.log(photos);
                            },
                            dataType: "json",
                            async: false,
                    });
            }

谢谢.

编辑:

我notica,如果我删除该行:

                            + "/albumid/"   +   album_ID

工作(当然,没有预期的反应).

Answer 1

看来CORS是罪魁祸首。Picasa 的标头响应在这两个请求之间有所不同。当它们包含时它就会成功access-control-allow-origin:*。

Picasa 将其包含在：https ://picasaweb.google.com/data/entry/base/user/114476218463019618611?alt=json&hl=en_US

但不在： https: //picasaweb.google.com/data/entry/base/user/114476218463019618611/albumid/5750459375839674337 ?alt=json&hl=en_US