websocket tutorial - Differences between WebSockets and AJAX - websocket - web socket
- Ajax uses the HTTP Protocol and can send requests using POST/GET methods from Client to Server.
- WebSocket is itself a protocol to communicate between Client and Server, distinct from HTTP.
- In Ajax when you send a request , server sends response for that request and connection ends.
- Using WebSockets when you establish a connection with server , then you can communicate between client and server as much you want and it keeps connection alive.
Learn Socket - Socket tutorial - Websocket Vs Ajax - Socket examples - Socket programs
Example getting notification
Ajax :
- New request :
- Client sends request : Server , Do you have new notification ?
- Server sends response : Client , NO
- connection ends
- New request :
- Client sends request : Server , Do you have new notification ?
- Server sends response : Client , NO
- connection ends
- New request :
- Client sends request : Server , Do you have new notification ?
- Server sends response : Client , NO
- connection ends
- New request :
- Client sends request : Server , Do you have new notification ?
- Server sends response : Client , Yes here you are
- connection ends
you see that there is number of useless requests !
web-socket
connection established :
- client says : Server , Do you have new notification ?
after xx time passed
- Server says : Yes I have
after xx time passed
- Server says : Yes I have
- Client says : Server , send new email if I have
after xx time passed
- Server says : now you got new email