Request.headers - Web API 接口参考 编辑

Request接口的只读属性  headers 包含与当前请求关联的Headers对象.

语法

var myHeaders = request.headers;

值

一个 Headers 对象.

例子

在下面的代码段中，我们使用 Request.Request() 构造函数（为获取与脚本处于同一目录的图片文件）创建新请求，然后将请求headers保存到变量中:

var myRequest = new Request('flowers.jpg');
var myHeaders = myRequest.headers; // Headers {}

使用 Headers.append 向 Headers 对象中添加header；然后，使用第二个init参数创建一个新的 Request ，同时，传递headers作为一个init选项:

var myHeaders = new Headers();
myHeaders.append('Content-Type', 'image/jpeg');

var myInit = { method: 'GET',
                   headers: myHeaders,
                   mode: 'cors',
                   cache: 'default' };

var myRequest = new Request('flowers.jpg',myInit);

myContentType = myRequest.headers.get('Content-Type'); // returns 'image/jpeg'

规范

Specification	Status	Comment
Fetch headers	Living Standard	Initial definition

浏览器兼容性

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The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

See also

• ServiceWorker API
• HTTP access control (CORS)
• HTTP

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