我收到像这样的cors错误无法加载https://api.gsdd.net/auth/api/AccessToken：对预检请求的响应没有't pass access control check: No ' Access-Control-Allow-Origin ' header is present on the requested resource. Origin ' http://rxtradezone.s3-website.ap-south-1.amazonaws.com'因此不允许访问 . 响应具有HTTP状态代码401 .

我正在尝试根据请求发送标头，但每次浏览器都会出现'No'Access-Control-Allow-Origin'标头存在' .

generateAccessTokenGsdb() {
    let token = 'Basic **************';
    let obj = {
      "Username": "user",
      "Password": "pwd"
    }
    let headers = new Headers(); 
    headers.append('Authorization', token);
    headers.append('Access-Control-Allow-Origin', `*`);
    headers.append('Access-Control-Expose-Headers', `*`);
    headers.append('Content-Type', 'application/json');
    headers.append('Access-Control-Allow-Methods', 'POST, GET, OPTIONS, DELETE');
    headers.append('Access-Control-Allow-Headers', '*');
    let options = new RequestOptions({ headers: headers, withCredentials: true });


    return this.http.post(`https://api.gsdd.net/auth/api/AccessToken`, obj, options)
  }

请帮助我，我相信 Headers 没有按要求设置 . 但是邮递员运行良好的api .

angular api header postman