读取URLLoader的服务器错误消息(Reading server error messages for a URLLoader)

 我有一个带有以下代码的URL加载器： 
 
public function getUploadURL():void {   
    var request:URLRequest = new URLRequest();

    var url:String = getPath();
    // Adds time to prevent caching
    url += "&time=" + new Date().getTime(); 

    request.url = url;
    request.method = URLRequestMethod.GET;

    _loader = new URLLoader();
    _loader.dataFormat = URLLoaderDataFormat.TEXT;
    _loader.addEventListener(Event.COMPLETE, getBaseURL);
    _loader.addEventListener(IOErrorEvent.IO_ERROR, onGetUploadURLError);
    _loader.addEventListener(HTTPStatusEvent.HTTP_STATUS, getHttpStatus);

    _loader.load(request);
}
 
 我的问题是这个请求可能是错误的，因此服务器会给我一个400 Bad Request，并提供一条消息来解释错误。 如果Event.COMPLETE，我可以在Event的“data”字段中看到服务器返回的一些消息（响应），但是如果调用onGetUploadURLError或getHttpStatus，它只是说错误代码是400但是没有显示我与之相关的信息。 
 
 “data”字段在getHttpStatus中未定义，而在onGetUploadURLError中为“”。 相反，在getBaseURL中，我得到：{“ResponseMetadata”：{...}}我检查过，我在浏览器中得到了类似的错误请求，但我看不到它。 
 
 知道我怎么可以取消消息？ 
 
 非常感谢，鲁迪 

I have an URL loader with the following code:
 
public function getUploadURL():void {   
    var request:URLRequest = new URLRequest();

    var url:String = getPath();
    // Adds time to prevent caching
    url += "&time=" + new Date().getTime(); 

    request.url = url;
    request.method = URLRequestMethod.GET;

    _loader = new URLLoader();
    _loader.dataFormat = URLLoaderDataFormat.TEXT;
    _loader.addEventListener(Event.COMPLETE, getBaseURL);
    _loader.addEventListener(IOErrorEvent.IO_ERROR, onGetUploadURLError);
    _loader.addEventListener(HTTPStatusEvent.HTTP_STATUS, getHttpStatus);

    _loader.load(request);
}
 
My problem is that this request might be wrong, and so the server will give me a back a 400 Bad Request, with a message to explain the error. If the Event.COMPLETE, I can see some message (a response) back from the server in the "data" field of the Event, but if onGetUploadURLError or getHttpStatus is called, it just says that the error code is 400 but does not show me the message associated with it. 
 
The "data" field is undefined in getHttpStatus and it is "" in onGetUploadURLError. On the contrary, in getBaseURL, I get: {"ResponseMetadata":{...}} I checked and I do get a similar response in my browser for a wrong request, but I cannot see it.
 
Any idea how I can please get the message?
 
Thank you very much, Rudy

原文：https://stackoverflow.com/questions/3009870