c – Poco :: HttpClientSession.receiveResponse()抛出NoMessag

URI uri("http://127.0.0.1:4444");
HTTPClientSession session(uri.getHost(),uri.getPort());

HTTPRequest req(HTTPRequest::HTTP_POST,"/pages/page",HTTPMessage::HTTP_1_1);

session.sendRequest(req);
HTTPResponse res;
std::istream &is = session.receiveResponse(res);

在最后一行,我收到以下错误：

terminate called after throwing an instance of 'Poco::Net::NoMessageException'
  what():  No message received

但我不明白为什么.连接已成功建立,并且请求的页面存在.我尝试了与已知网站(如维基百科)相同的代码,它没有任何例外.

我还尝试在命令行中使用cURL(到我的服务器)发出完全相同的请求,它显示服务器的响应,因此服务器看起来很好.

这是服务器以字符串形式的原始响应：

"HTTP/1.1 200 OKrn" +
"Server: [server name]rn" +
"Content-Type: text/xml; charset=utf-8rn" +
"Content-Length:" + bodyBytes.length + "rn" +
"Resource: " + job.resId + "rnrn" + 
"<?xml version="1.0" encoding="UTF-8"?><JobRequest><InputRepresentation id="0"/>    <effectsList><cvtColor><code> CV_RGB2GRAY </code></cvtColor><resize><scaleFactorX> 0.5 </scaleFactorX><scaleFactorY> 0.5 </scaleFactorY><interpolation> INTER_LINEAR </interpolation></resize><GaussianBlur><kSize> 3 </kSize><sigmaX> 2 </sigmaX><sigmaY> 2 </sigmaY><borderType> BORDER_REPLICATE </borderType></GaussianBlur></effectsList></JobRequest>"

我编写了一个简单的HTTP服务器,它响应每个请求的固定响应,以测试出错的地方.这是代码：

public class Test {
    public static void main(String[] args) {    
        try {
            ServerSocket serverSocket = new ServerSocket(4449);
            Socket clientSocket = serverSocket.accept();

            String body = "ab";
            byte[] bodyBytes = body.getBytes("UTF-8");

            String headers = "HTTP/1.1 200 OKrn" + 
                             "Server: Foorn" +
                             "Content-Type: text/plainrn" +
                             "Content-Length: " + bodyBytes.length + "rnrn";

            byte[] headerBytes = headers.getBytes("UTF-8");

            byte[] responseBytes = new byte[headerBytes.length + bodyBytes.length];

            /* Fill responseBytes with the header and body bytes */
            int i = 0;
            for (int j = 0; j < headerBytes.length; ++j) {
                responseBytes[i] = headerBytes[j];
                ++i;
            }
            for (int j = 0; j < bodyBytes.length; ++j) {
                responseBytes[i] = bodyBytes[j];
                ++i;
            }
            clientSocket.getOutputStream().write(responseBytes);

        } catch (IOException e) {}
    }
}

即使使用此服务器,我也会得到相同的异常.那么这里有什么问题？