如何防止带有Lambda Java后端的API网关WebSocket API在30秒后超时？
AWS API Gateway和re：invent视频提到使用ping或heartbeats来保持WebSocket连接，但我还没有找到一个直接的工作示例（Java）。前端使用HTML 5 Websockets（vanilla JavaScript）。
我在Java中包含了我的Lambda测试驱动程序。它会导致API网关WS API在30秒后超时，如文档所示。如果您删除延迟，驱动程序将成功返回。感谢任何帮助.

import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestStreamHandler;
import com.fasterxml.jackson.databind.ObjectMapper;
public class TestWSClient implements RequestStreamHandler {
    public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context) {
        try {
            //
            // How do we keep API Gateway from timing out after 30 seconds?
            // Is something like this even needed in the lambda?
            //
            new Thread(() -> {
                while(true) {    
                    try {
                        // Ping client every 15 seconds
                        Thread.sleep(15000);
                        //outputStream.write(); // What to write -- 0x89 0x00?
                        outputStream.flush();
                    } catch(Exception e) { e.printStackTrace(); }
                }
            }).start();
            //
            // Simulate long processing time or streaming
            //
            // NOTE: commenting sleep enables service to return w/o a timeout
            //       connection from API Gateway
            //
            try { Thread.sleep(60000); } catch(Exception e) {}
            var response = Map.of(
                "statusCode", 200,
                "headers", Map.of("Content-Type", "text/csv"),
                "body", "Hello,World"
            );
            ObjectMapper om = new ObjectMapper();
            outputStream.write(om.writeValueAsBytes(response));
            outputStream.flush();
        } catch(Exception e) { e.printStackTrace(); }
        finally { try { outputStream.close(); } catch(Exception e) {} }
    }
}

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