arcgis api4.x修改请求和增加headers头

使用esri/config这个类的request方法：

config.request.interceptors.push({
    before: function(params) {
        //这里写请求之前的处理逻辑
    },
    // use the AfterInterceptorCallback to check if `ssl` is set to 'true'
    // on the response to the request, if it's set to 'false', change
    // the value to 'true' before returning the response
    after: function(response) {
        //这里写请求之后的处理逻辑
    },
    headers:{//增加请求的headers头
        "X-OPENAPI-SubscriptionToken":"2889496a4f2c43af92857b41cb682fac"
    }
});