Request.headers

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since March 2017.

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

一个 Headers 对象。

示例

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:

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

使用 Headers.appendHeaders 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:

js
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
Fetch
# ref-for-dom-request-headers②

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
headers

Legend

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Full support
Full support

参见