Handling when app cannot connect to server via websockets?

1. What can I use instead of a WebSocket?
2. Why is my WebSocket connection failing?
3. Can I use WebSockets for mobile app?

What can I use instead of a WebSocket?

WebTransport is a new specification that could offer an alternative to WebSockets. For applications that need low-latency, event-driven communication between endpoints, WebSockets has been the go-to choice, but WebTransport may change that.

Why is my WebSocket connection failing?

Possible explanations: You are trying to reach a plain WebSocket server. The server is not reachable. The client is not compatible with the version of the server.

Can I use WebSockets for mobile app?

Definitely, a WebSocket web app will run on any HTML5-compliant browser, including mobile browsers such as Safari for iOS and Chrome for mobile. Therefore, there are no worries about compatibility issues with smartphones.