自定义标头不会添加到Request对象 [英] custom headers are not added to Request object

问题描述

我正在尝试使用 fetch api。

I'm trying to use fetch api.

首先我创建一个新的Headers（）对象：

var oHeaders = new Headers({
    'Accept': 'application/json',
    'Content-Type': 'application/json',
    "X-DocuSign-Authentication": '{"Username":"xxx","Password":"xxx","IntegratorKey":"xxx"}'
})

如果我尝试记录标题，那么在实例化标题之后，一切都是正确的。

After headers is instantiated if i try to log headers everything is correct.

oHeaders.forEach(function(v){console.log(v)})
//logs: 2 application/json {"Username":"xxx","Password":"xxx","IntegratorKey":"xxx"}

我创建了Request对象：

the i create the Request object:

var oReq = new Request('https://eu.docusign.net/restapi/v2/login_information', {
  method: 'GET',
  headers: oHeaders,
  mode: 'no-cors',
});

如果我尝试仅记录请求对象的标题 accept 标题将在那里。

If i try to log the headers of the request object only the accept header will be there.

oReq.headers.forEach(function(v){console.log(v)})
//logs: application/json

如果我尝试 fetch（oReq）​​我得到 401未经授权的回复。

If i try to fetch(oReq) i get 401 unauthorized response.

什么使标题消失？

推荐答案

设置模式时：'no-cors'对于请求，浏览器不允许您设置除 CORS-safelisted请求标头。请参阅规范要求：

When you set mode: 'no-cors'for a request, browsers won’t allow you to set any request headers other than CORS-safelisted request-headers. See the spec requirements:

将名称/值（名称 / 值）对附加到标题 object（ headers ），运行以下步骤：

To append a name/value (name/value) pair to a Headers object (headers), run these steps:

1. 否则，如果 guard 是 request-no-cors 而名称 / 值不是 CORS-safelisted请求标题，返回。

1. Otherwise, if guard is "request-no-cors" and name/value is not a CORS-safelisted request-header, return.

在该算法中， return 等于返回将该标题添加到Headers对象。

In that algorithm, return equates to "return without adding that header to the Headers object".

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