根据对话框流程文档上下文的生存期为20分钟。这间接意味着该会话具有相同的生存期。但是，当我尝试此操作时，我感觉不到20分钟。这更像是10-20分钟。仅存储会话ID将无济于事。您将必须保存收到的响应的上下文，并在下次发送请求时将其发送。

According to the dialogflow documentation a context has a lifetime of 20 mins. Which indirectly means that the session has the same lifetime. But when I was trying this out I felt this is less than 20 mins. Which is more like 10-20 mins. Only storing the session ID won't help. You will have to save the contexts of the response received and send it with the request next time.