从服务器发送消息到 Js 客户端

Question

I am trying to implement websockets in my Java j2ee servlet application. I am trying to send messages using the websockets. I have it working for multiple js clients and websocket server on java backend. Now, I also want to implement a way to send messages from java backend to the js client, without having to initiate anything from the js client itself. Is there anyway to achieve this?

Answer 1

There is no way for an HTTP 1 server to initiate a WebSocket connection to an HTTP client. The client must initiate it.

However, HTTP 2 offers the alternative of combining server-side events and document push requests; see Server-initiated requests .