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I am implementing a Jetty Websocket servlet. When the server receives a new connection, I want to send a message that will be read by websocket's onopen function. I want this message to be sent only during the open and not using the regular connection.SendMessage() function. Is it possible to do that? and how?
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To send a message through the WebSocket connection you call the send() method on your WebSocket instance; passing in the data you want to transfer. socket. send(data); You can send both text and binary data through a WebSocket.
First, APIs are needed to load the file from the file system, then the file is transformed into a suitable payload to be sent over web sockets, and finally, server-side code is required to receive the file.
The Message event takes place usually when the server sends some data. Messages sent by the server to the client can include plain text messages, binary data, or images. Whenever data is sent, the onmessage function is fired.
To create a WebSocket and open the connection to FME Server use getWebSocketConnection method. The result is an open WebSocket you can use in your application to communicate with FME Server. This example sends a basic JSON object as a string to the server, and displays the response from the server.
Don't forget the query string. It's valid in WebSocket url.
new Websocket('ws://yoursite.com/path?a=1&b=2&c=3') Then you can easily parse this url on server side to retrieve the data.
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There is no support for this in the protocol but you could fudge something yourself.
onopen function, send a "read initial message" request.
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