AJAX请求失败jQuery中而不是在

Question

的NodeJS我

有一个RESTful Web服务（托管通过IIS不同的服务器上），返回JSON。奇怪的是下面的NodeJS命令行测试应用（不是通过网页浏览器，而是通过命令行）工作正常，并返回JSON：

工作的NodeJS应用：

var request = require("request"); 
var btoa = require("btoa"); 

var uname = "corp\\user.name"; 
var pword = "password123" 

var options = { 
    url: "http://192.168.3.142/v1/foo?format=json", 
    headers: { 
     "Authorization": "Basic " + btoa(uname + ":" + pword) 
    } 
}; 

request(options, function(err, response, body) { 
    console.log(body); 
}); 

然而

OPTIONS http://192.168.3.142/v1/foo?format=json 401 (Unauthorized) jquery-1.11.0.min.js:4 
XMLHttpRequest cannot load http://192.168.3.142/v1/foo?format=json. Invalid HTTP status code 401 

这是来自服务器的响应报头：

具有以下AJAX请求失败

AJAX代码：

$.ajaxSetup({ 
    beforeSend: function (xhr, settings) { 
     var creds = { 
      username: "corp\\user.name", 
      password: "password123" 
     }; 
     xhr.setRequestHeader("Authorization", "Basic " + btoa(creds.username + ":" + creds.password)); 
     return true; 
    } 
}); 

$.ajax({ 
    type: "GET", 
    url: "http://192.168.3.142/v1/foo?format=json", 
    success: function (data, text) { 
     console.log(data); 
    } 
}); 

UPDATE：

抛出相同401（未授权）：

var creds = { 
    username: "corp\\user.name", 
    password: "password123" 
}; 
var credentials = btoa(creds.username + ":" + creds.password); 
$.ajax({ 
    type: "GET", 
    dataType: "text/json", 
    url: "http://192.168.3.142/v1/foo?format=json", 
    beforeSend: function (xhr) { 
     xhr.setRequestHeader("Authorization", "Basic " + credentials); 
     return true; 
    }, 
    success: function (data, text) { 
     console.log(data); 
    } 
}); 

Answer 1

一旦我添加xhrFields: { withCredentials: true }到$.ajaxSetup({});错误返回：

Credentials flag is 'true', but the 'Access-Control-Allow-Credentials' header is ''. It must be 'true' to allow credentials.

我在服务器端添加Access-Control-Allow-Credentials: true，现在它的正常工作。

var creds = { 
    username: "username", 
    password: "password" 
}; 
var credentials = btoa(creds.username + ":" + creds.password); 
$.ajaxSetup({ 
    xhrFields: { withCredentials: true }, 
    beforeSend: function (xhr, settings) { 
     xhr.setRequestHeader("Authorization", "Basic " + credentials); 
     return true; 
    } 
}); 

$.ajax({ 
    type: "GET", 
    url: "http://localhost/v1/service", 
    async: true, 
    success: function (data, text) { 
     console.log(data); 
    } 
});