如果您在使用Alexa Skill开发过程中遇到了“403 Forbidden”错误，可能是由于使用了不正确的权限，在Alexa Developer Console中编辑您的技能并添加必要的权限。 另外，根据您使用的语言和框架不同，可能需要对代码进行相应的更改。以下是Node.js中使用渐进响应的示例代码：

const request = require('request');
const Alexa = require('ask-sdk-core');

const LaunchRequestHandler = {
    canHandle(handlerInput) {
        return handlerInput.requestEnvelope.request.type === 'LaunchRequest';
    },
    handle(handlerInput) {
        const speechOutput = 'Welcome to my skill!';
        const repromptOutput = 'Please tell me how can I help you.';
        const attributes = handlerInput.attributesManager.getSessionAttributes();
        attributes.lastResponse = '';
        return handlerInput.responseBuilder
            .speak(speechOutput)
            .reprompt(repromptOutput)
            .getResponse();
    }
};

const MyIntentHandler = {
    canHandle(handlerInput) {
        return handlerInput.requestEnvelope.request.type === 'IntentRequest'
            && handlerInput.requestEnvelope.request.intent.name === 'MyIntent';
    },
    handle(handlerInput) {
        const attributes = handlerInput.attributesManager.getSessionAttributes();
        const firstResponse = 'This is my first response. ';
        attributes.lastResponse = firstResponse;
        handlerInput.responseBuilder
          .speak(firstResponse)
          .addDirective(buildProgressiveResponseDirective('Processing your request.', '3000'))
          .getResponse();
          // Call external API
          // return response
          const secondResponse = 'This is my second response. ';
          attributes.lastResponse = secondResponse;
          return handlerInput.responseBuilder
              .speak(secondResponse)
              .reprompt('Please tell me how can I help you with.')
              .getResponse();
    }
};

function buildProgressiveResponseDirective(directive, delayMs){
    return {
        "type": "Dialog.UpdateDynamicEntities",
        "updateBehavior": "REPLACE",
        "types": []
    },
    {
        "type": "VoicePlayer.Speak",
        "delayInMilliseconds": delayMs,
        "text": directive
    };
}

const skillBuilder = Alexa.SkillBuilders.custom();

exports.handler = skillBuilder
    .addRequestHandlers(
        LaunchRequestHandler,
        MyIntentHandler
    )
    .withSkillId(YOUR_SKILL_ID)
    .lambda();

通过使用上面提供的示例代码，您可以在Node.js中使用渐进响应，同时确保在Alexa Developer Console中正确设置了所需的权限。