Angular.js HTTP请求失败

Question

我对网络开发很陌生，所以我需要帮助。 我想向Web服务器发送HTTP请求以获取一些数据。要授权用户，我必须在用户代理标头中发送一个秘密。

$http({
        method: 'GET',
        url: 'https://my-website/some_data',
        headers: {
            'Accept': 'application/json;charset=UTF-8',
            'User-Agent': 'service/2.0 (Android 4.3) sec=secret_key'
        }

     }).success(function(data){
        $scope.locations = data;
    }).error(function(data, status, headers, config) {
        alert("error");
    });

问题是Chrome始终打印：

Refused to set unsafe header "User-Agent"

和

XMLHttpRequest cannot load
https://my-website/some_data. No
'Access-Control-Allow-Origin' header is present on the requested
resource. Origin 'http://127.XXXXX' is therefore not allowed
access. The response had HTTP status code 403.

出了什么问题？