以下代码完美地使用 CORS 协议(protocol)发送请求并接收响应。我想将内容类型 header 更改为“application/json”而不是“application/x-www-form-urlencoded”。但是，当我将内容类型替换为“application/json”时，请求失败。当我在浏览器中检查请求时，我可以看到内容类型 header 已被删除而不是更改。
var servicesApp = angular.module('services', [])
.config(function($httpProvider){
/* Enable CORS */
$httpProvider.defaults.useXDomain = true;
delete $httpProvider.defaults.headers.common['X-Requested-With'];
})
.factory('model', function($http) {
var testJSON = '{"employees": [ {"firstName":"John", "lastName":"Doe"} ] }';
$http({
url: 'http://127.0.0.1:8081/controller/UIController',
method: "POST",
params: {"path" : "save"},
data: "message= " + testJSON,
headers: {'Content-Type': 'application/x-www-form-urlencoded'}
}).success(function (data, status, headers, config) {
alert(data.ExampleForm[1]);
}).error(function (data, status, headers, config) {
alert(status);
});
来自上述代码的请求
Request URL:http://127.0.0.1:8081/controller/UIController?path=save
Request Method:POST
Status Code:200 OK
Request Headersview source
Accept:application/json, text/plain, */*
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-GB,en-US;q=0.8,en;q=0.6
Connection:keep-alive
Content-Length:67
Content-Type:application/x-www-form-urlencoded
Host:127.0.0.1:8081
Origin:http://127.0.0.1:8020
Referer:http://127.0.0.1:8020/TwineClient/src/index.html
User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.107 Safari/537.36
Query String Parametersview sourceview URL encoded
path:save
Form Dataview sourceview URL encoded
message: {"employees": [ {"firstName":"John", "lastName":"Doe"} ] }
Response Headersview source
Access-Control-Allow-Headers:Content-Type
Access-Control-Allow-Methods:POST
Access-Control-Allow-Origin:*
Content-Length:51
Content-Type:application/json;charset=ISO-8859-1
Date:Tue, 11 Feb 2014 16:15:00 GMT
Server:Apache-Coyote/1.1
当“application/x-www-form-urlencoded”替换为“application/json”时:
Request URL:http://127.0.0.1:8081/controller/UIController?path=save
Request Method:OPTIONS
Status Code:200 OK
Request Headersview source
Accept:*/*
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-GB,en-US;q=0.8,en;q=0.6
Access-Control-Request-Headers:accept, content-type
Access-Control-Request-Method:POST
Connection:keep-alive
Host:127.0.0.1:8081
Origin:http://127.0.0.1:8020
Referer:http://127.0.0.1:8020/TwineClient/src/index.html
User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.107 Safari/537.36
Query String Parametersview sourceview URL encoded
path:save
Response Headersview source
Allow:GET, HEAD, POST, TRACE, OPTIONS
Content-Length:0
Date:Tue, 11 Feb 2014 16:11:02 GMT
Server:Apache-Coyote/1.1
最佳答案
当您将内容类型更改为 application/json 时，浏览器正在发送预检 (OPTIONS) 请求。根据 CORS 规范，这是必需的步骤。如果您想使用 application/json 作为请求内容类型，您的服务器将需要正确确认此预检。您可以在这里阅读有关 CORS 的更多信息:https://developer.mozilla.org/en-US/docs/HTTP/Access_control_CORS .
这是关于 SO 的常见问题解答，我在这里回答了类似的问题:WebAPI 2 - CORS not working with contentType application/json .
关于javascript - 未添加 AngularJS Content-Type header ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21705523/