Access-Control-Allow-Origin不允许使用$ http.get,但$ .ajax是

Question

我从我控制的远程服务器获取json时遇到问题.我有2个Web应用程序,一个服务数据并在端口3311上运行,另一个请求数据,正在端口5000上运行.

使用jquery以下工作:

$.ajax({
  url: "http://localhost:3311/get-data",
  type: 'GET',
  dataType: 'json',
  beforeSend: function(xhr) {
    xhr.setRequestHeader("x-some-header", "some-value");
  }
})
.done(function(data) { 
    $rootScope.$apply(function() {d.resolve(data); });
})
.fail(function(data) {
    $rootScope.$apply(function() {d.reject(data); });
});

当使用angular尝试相同的get请求时

$http
    .get("http://localhost:3311/get-data", { headers: {"x-some-header": "some-value"} })
    .success(function(data) { d.resolve(data);})
    .error(function(data) { d.reject(data); });

我收到错误

Origin http://localhost:5000 is not allowed by Access-Control-Allow-Origin.

控制台日志显示OPTIONS请求返回HTTP200后发生的错误

OPTIONS http://localhost:3311//get-data 200 (OK) angular.min.js:99

(anonymous function) angular.min.js:99

l angular.min.js:95

m angular.min.js:94

(anonymous function) app.js:78

b.extend.each jquery-1.9.1.min.js:3

b.fn.b.each jquery-1.9.1.min.js:3

(anonymous function) app.js:76

d angular.min.js:28

instantiate angular.min.js:28

(anonymous function) angular.min.js:52

updateView angular-ui-states.js:892

e.$broadcast angular.min.js:90

transition angular-ui-states.js:324

h angular.min.js:77

(anonymous function) angular.min.js:78

e.$eval angular.min.js:88

e.$digest angular.min.js:86

e.$apply angular.min.js:88

e angular.min.js:94

o angular.min.js:98

s.onreadystatechange angular.min.js:99

并且从OPTIONS请求返回的标头是

HTTP/1.1 200 OK
Cache-Control: private
Content-Type: text/plain
Server: Microsoft-IIS/8.0
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET, POST, OPTIONS
Access-Control-Allow-Headers: Content-Type, Accept, X-Requested-With, x-some-header
X-AspNet-Version: 4.0.30319
X-SourceFiles: =?UTF-8?B?....
X-Powered-By: ASP.NET
Date: Tue, 21 May 2013 01:52:37 GMT
Content-Length: 0

Answer 1

这可能是由于Angular的默认行为包含请求标头'X-Requested-With',这可能会导致CORS出现问题.通过从跨域请求中删除标头,修复了v 1.1.1(不稳定分支 - 请参阅v1.1.1错误修复):https://github.com/angular/angular.js/issues/1004.

删除标题很容易,并在1.0分支上运行.以下行将删除应用中$ http服务完成的所有请求(不仅仅是CORS)的标头:

yourModule
  .config(function($httpProvider){
    delete $httpProvider.defaults.headers.common['X-Requested-With'];
});

更新 一点警告 - Angular(如jQuery)不支持IE9的CORS.IE10是第一款支持CORS的IE浏览器.这篇博文描述了如何在某些条件下在IE8/IE9中获得CORS支持,但它不适用于Angular $ http服务:http://blogs.msdn.com/b/ieinternals/archive/2010/05/ 13/xdomainrequest的限制-局限性和- workarounds.aspx