Request

你可以使用  Request.Request() 构造函数创建一个 Request 对象，但是你可能会遇到一个 Request 对象作为其它 API 的操作被返回，比如一个 service worker FetchEvent.request。

构造器

Request.Request()

创建一个新的 Request 对象。

属性

Request.method 只读

请求使用的方法 (GET, POST, 等.)

Request.url 只读

请求使用的 URL。

Request.headers 只读

请求所关联的 Headers 对象。

Request.context 只读  

请求的上下文 例如：(例如：audio, image, iframe, 等)

Request.referrer 只读

请求的来源 (例如：client).

Request.mode 只读

请求的模式 (例如： cors, no-cors, same-origin).

Request.credentials 只读

请求的凭证 (例如： omit, same-origin).

Request.redirect 只读

如何处理重定向模式 (例如： follow, error, or manual)

Request.integrity 只读

请求内容的 subresource integrity 值 (例如： sha256-BpfBw7ivV8q2jLiT13fxDYAe2tJllusRSZ273h2nFSE=).

Request.cache 只读

请求的缓存模式 (例如： default, reload, no-cache).

Request implements Body, so it also has the following property available to it:

Body.bodyUsed 只读

指示body是否被使用， 类型为Boolean

方法

Request.clone()

创建当前request的副本。

Request implements Body, so it also has the following methods available to it:

Body.arrayBuffer()

Returns a promise that resolves with an ArrayBuffer representation of the request body.

Body.blob()

Returns a promise that resolves with an Blob representation of the request body.

Body.formData()

Returns a promise that resolves with an FormData representation of the request body.

Body.json()

Returns a promise that resolves with an JSON representation of the request body.

Body.text()

Returns a promise that resolves with an USVString (text) representation of the request body.

Note: The Body functions can be run only once; next calls will resolve with empty strings/ArrayBuffers.

示例

在下面的代码中，我们使用 Request ( ) 构造函数创建了一个新的 request 实例 （用来请求同一目录下的图片）, 然后返回 request 的一些属性。

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

var myURL = myRequest.url; // http://localhost:8000/flowers.jpg
var myMethod = myRequest.method; // GET
var myCred = myRequest.credentials; // omit

You could then fetch this request by passing the Request object in as a parameter to a GlobalFetch.fetch() call, for example:

fetch(myRequest).then(function(response) {
      return response.blob();
    }).then(function(response) {
      var objectURL = URL.createObjectURL(response);
      myImage.src = objectURL;
    });

规范

浏览器兼容性

相关链接

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