Java SSE 服务器与 com.sun.net.httpserver.HttpServer

Question

如何用com.sun.net.httpserver.HttpServer实现 SSE Server
我写了这样简单的HttpHandler来测试连接：

public class SseResource implements HttpHandler {

    @Override
    public void handle(HttpExchange exchange) throws IOException {
        Headers responseHeaders = exchange.getResponseHeaders();
        responseHeaders.add("Content-Type", "text/event-stream");
        responseHeaders.add("Connection", "keep-alive");
        responseHeaders.add("Transfer-Encoding", "chunked");
        responseHeaders.add("X-Powered-By", "Native Application Server");

        exchange.sendResponseHeaders(200, responseHeaders.size());
        OutputStream writer = exchange.getResponseBody();
        for (int i = 0; i < 10; i++) {
            writer.write("event: count\n".getBytes()); // <-- Connection Closed at this line 
            writer.write(("data: " + i + "\n").getBytes());
            writer.write("\n\n".getBytes());
            writer.flush();
            sleep();
        }

        writer.close();
    }


    public static void sleep() {
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}    

不工作。
我用 Linux curl命令测试连接：

curl -Ni http://localhost:8080/stream

HTTP/1.1 200 OK
Connection: keep-alive
X-powered-by: Native Application Server
Date: Thu, 10 Jun 2021 05:27:56 GMT
Transfer-encoding: chunked
Content-type: text/event-stream
Content-length: 4

curl: (18) transfer closed with outstanding read data remaining

我对 SSE 服务器有误解吗？ 还是我的代码有问题？

Answer 1

响应大小应为零。
我将我的响应标头与此项目的结果进行比较： https://github.com/enkot/SSE-Fake-Server

exchange.sendResponseHeaders(200, 0);