Java twilio教程问题

我在上一节课的时候听了教程，现在正在录音。twilio日志显示“使用404访问/处理密钥时出现问题”。我使用localtunnel进行设置，并将我的号码配置为指向url。问候语起作用了，我只在拨号盘上选择1或2时遇到问题。非常感谢您的帮助。

TwilioHandlerRecordingServlet：

package com.twilio;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;

import com.twilio.sdk.verbs.TwiMLResponse;
import com.twilio.sdk.verbs.TwiMLException;
import com.twilio.sdk.verbs.Say;
import com.twilio.sdk.verbs.Play;
import com.twilio.sdk.verbs.Dial;

public class TwilioHandleRecordingServlet extends HttpServlet {

    public void service(HttpServletRequest request, HttpServletResponse response) throws IOException {

        String recordingUrl = request.getParameter("RecordingUrl");
        TwiMLResponse twiml = new TwiMLResponse();
        if (recordingUrl != null) {
            try {
                twiml.append(new Say("Thanks for howling... take a listen to what you howled."));
                twiml.append(new Play(recordingUrl));
                twiml.append(new Say("Goodbye"));
            } catch (TwiMLException e) {
                e.printStackTrace();
            }
        } else {
            response.sendRedirect("/twiml");
            return;
        }

        response.setContentType("application/xml");
        response.getWriter().print(twiml.toXML());
    }
}