未添加AngularJS内容类型标题

Question

以下代码使用CORS协议完美地发送请求并接收响应。我想将内容类型标头更改为“应用程序/json”而不是“应用程序/x-www-form-urlencoded”。但是，当我将内容类型替换为“应用程序/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标头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);
        });

来自以上代码的请求

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“应用程序/x-web-form-urlencoded”被替换为“应用程序/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

Answer 1

当您将内容类型更改为application/json时，浏览器将发送飞行前（选项）请求。根据CORS规范，这是一个必需的步骤。如果您想使用application/json作为请求内容类型，您的服务器需要正确地确认此预飞行。您可以在此处阅读有关CORS的更多信息：https://developer.mozilla.org/en-US/docs/HTTP/Access_control_CORS.

这是一个常见问题解答，我在这里回答了一个类似的问题：WebAPI 2-CORS不使用contentType application/json。