.net 无法从axios调用访问标头

我正在使用axios开发React Redux应用程序来拨打REST电话。我正在尝试将令牌注入到授权标头中，以供.NET REST API用于验证调用。我尝试了多种方法来发送标题，但似乎都不起作用。我甚至试过不走运地去捡东西。我可以看到HTTPRequestMessage对象的“Access Control Allow Headers”属性中列出的头，但无法查看或访问该值。当我使用邮递员发送它时，授权标头设置正确。以下是反应代码：

function callApi(endpoint, authenticated, data) {
  let token = localStorage.getItem('id_token') || null;

const api = axios.create({method: 'POST', headers: {'Access-Token': `${token}`, 'Authorization': `${token}`,  'Content-Type': 'application/x-www-form-urlencoded'}});

 //return fetch(BASE_URL + endpoint, config)
 return api.post(BASE_URL + endpoint, config)
    .then(response =>
      response.text()
      .then(data => ({ data, response }))
    ).then(({ data, response }) => {

      if (!response.ok) {
        return Promise.reject(data);
      }

      return data;
    }).catch(err => console.log(err));
}

在.NET控制台中，您可以看到授权标头为空：

request.Headers
{Connection: keep-alive
Accept: */*
Accept-Encoding: gzip, deflate, sdch, br
Accept-Language: en-US, en; q=0.8, de; q=0.6
Host: localhost:3001
Referer: http://localhost:8080/
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36
Access-Control-Request-Method: POST
Origin: http://localhost:8080
Access-Control-Request-Headers: access-token, authorization
}
    Accept: {*/*}
    AcceptCharset: {}
    AcceptEncoding: {gzip, deflate, sdch, br}
    AcceptLanguage: {en-US, en; q=0.8, de; q=0.6}
    Authorization: null
    CacheControl: null
    Connection: {keep-alive}
    ConnectionClose: null
    Date: null
    Expect: {}
    ExpectContinue: null
    From: null
    Host: "localhost:3001"
    IfMatch: {}
    IfModifiedSince: null
    IfNoneMatch: {}
    IfRange: null
    IfUnmodifiedSince: null
    MaxForwards: null
    Pragma: {}
    ProxyAuthorization: null
    Range: null
    Referrer: {http://localhost:8080/}
    TE: {}
    Trailer: {}
    TransferEncoding: {}
    TransferEncodingChunked: null
    Upgrade: {}
    UserAgent: {Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36}
    Via: {}
    Warning: {}

下面是我在web.config中的CORS条目：

 <httpProtocol>
      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
        <add name="Access-Control-Allow-Headers" value="Content-Type, Authorization, X-Custom-Header, Access-Token" />
        <add name="Access-Control-Expose-Headers" value="Content-Type, Authorization, X-Custom-Header, Access-Token" />
        <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
      </customHeaders>
    </httpProtocol>

谢谢你的检查