我必须显式地关闭异步http请求的ResponseStream吗?

我有一个Azure worker角色正在运行，除了其他功能外，它每80秒左右发出一些HTTP请求。这是连续发生的。随着我们的扩展，它可能会产生更多的HTTP请求，因此我编写了使用BeginGetResponse、EndGetResponse和回调的代码。问题是……我们在某个地方有内存泄漏。当这个进程运行时，它会缓慢但肯定地丢失内存，直到完全耗尽。有时GC会启动并释放一些未使用的对象，但它会继续缓慢下降的趋势。

当我们的回调执行并且我们用EndGetResponse()完成请求时，我们不触及响应流。我们需要知道的是HTTP状态码，我们将其保存为我们自己的记录。我们从不调用GetResponseStream()然后关闭它。我们做 Close() HttpWebResponse.

我的问题是:我们是否需要对响应流做一些事情，然后关闭()它?不这样做会导致内存泄漏吗?我所看到的所有MS示例/其他SO讨论都与流有关。我想知道我们是否应该添加GetResponseStream().Close()…

代码如下:

// the request state class, passed along with async request
public class RequestState
{             
    public HttpWebRequest Request { get; set; }
    public HttpWebResponse Response { get; set; }
    // some other properties to track which request this is..
}
...... in some other class .....
// code to perform the request
public void DoHttpRequest() 
{
    HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://myurl.....");
    RequestState state = new RequestState(req); // this just sets the Request property on RequestState
    req.BeginGetResponse(OnRequestComplete, state);
}
// the callback, request has finished
public void OnRequestComplete(IAsyncResult result)
{
    RequestState state = (RequestState)result.AsyncState;
    HttpWebRequest req = state.Request;
    state.Response = (HttpWebResponse)req.EndGetResponse(result);
    // we do not care about the body of the response
    // all we want is the status code, which we store somewhere else..
    if (state.Response.StatusCode == HttpStatusCode.OK || state.Response.StatusCode == HttpStatusCode.Created)
    {
         // comm was successful
         // save this result code somewhere...
    }
    else if (state.Response.StatusCode == HttpStatusCode.RequestTimeout || state.Response.StatusCode == HttpStatusCode.GatewayTimeout)
    {
          // comm timed out
          // save this result code somewhere..
    }
    else
    {
          // something else, comm failed
          // save this result code somewhere..
    }
    // we've got the relevant data from the HttpWebResponse object, dispose of it
    state.Response.Close();
}

谢谢!