我正在开发一个Web应用程序，我正在使用firebase云消息传递（FCM）向用户发送通知，我已经创建了一个Android应用程序，我能够从firebase接收推送消息，但是当我实现了同样适用于Web应用程序，它无法正常工作。我收到一条错误消息＆＃34;检索令牌时发生错误＆＃34; 我按照这里提到的所有步骤 https://firebase.google.com/docs/cloud-messaging/js/client
I have some doubts.
* Whether it is possible to receive notification in http instead on https
* is there any tool to receive push message, so that i cam assume that the server part is working properly