c# - HttpListenerResponse 及其 ContentLength64 属性的无限值

Question

我在代理 http 流时遇到了问题。

首先:我正在使用 VLC 播放器创建 http 协议(protocol)媒体流服务器。

第二:我正在使用 HttpListener 在一个端口上监听 http 请求，并尝试将来自 vlc 服务器端口的响应转发为第一个端口的响应。

代理:

Client            Server(:1234)                         VLC(:2345)
       -request-> HttpListener
                  HttpWebRequest           -request->
                  HttpWebResponse         <-response-
                 Stream <=Copy= Stream
      <-response- HttpListenerResponse

一切正常。但仍然存在一个问题。我正在尝试将实时流复制到 HttpListenerResponse。但我无法为其属性 ContentLength64 附加负值。 HttpWebResponse ContentLength 属性的值为 -1。它应该是无限长度内容的值。

这是必需的，因为我正在转发直播。

void ProxyRequest(HttpListenerResponse httpResponse)
{
    HttpWebRequest HttpWReq = (HttpWebRequest)WebRequest.Create("http://localhost:2345");
    HttpWebResponse HttpWResp = (HttpWebResponse)HttpWReq.GetResponse();

    // this must be >=0. Throws ArgumentOutOfRangeException "The value specified for a set operation is less than zero."
    httpResponse.ContentLength64 = HttpWResp.ContentLength;

    byte[] buffer = new byte[32768];
    int bytesWritten = 0;
    while (true)
    {
        int read = HttpWResp.GetResponseStream().Read(buffer, 0, buffer.Length);
        if (read <= 0)
            break;
        httpResponse.OutputStream.Write(buffer, 0, read);
        bytesWritten += read;
    }
}

有人能解决这个问题吗？

Answer 1

将 SendChunked 属性设置为 true 并删除 ContentLength64 值分配应该是解决方案。就像您提供的链接中所描述的那样。

void ProxyRequest(HttpListenerResponse httpResponse)
{
    HttpWebRequest HttpWReq = (HttpWebRequest)WebRequest.Create("http://localhost:2345");
    HttpWebResponse HttpWResp = (HttpWebResponse)HttpWReq.GetResponse();

    // Solution!!!
    httpResponse.SendChunked = true;

    byte[] buffer = new byte[32768];
    int bytesWritten = 0;
    while (true)
    {
        int read = HttpWResp.GetResponseStream().Read(buffer, 0, buffer.Length);
        if (read <= 0)
            break;
        httpResponse.OutputStream.Write(buffer, 0, read);
        bytesWritten += read;
    }
}