I am developing websocket server with netty frame work version 4.1.6. I am using the sample code from netty example site This is my server source code:
public class WebSocketServer
{
static final int PORT = 4466;
public static void main(String[] args)
{
final SslContext sslCtx;
EventLoopGroup bossGroup = new NioEventLoopGroup(1);
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
SelfSignedCertificate ssc = new SelfSignedCertificate();
sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.handler(new LoggingHandler(LogLevel.INFO))
.childHandler(new WebSocketServerInitializer(sslCtx));
Channel ch = b.bind(PORT).sync().channel();
System.out.println("Open your web browser and navigate to " +
"http://127.0.0.1:" + PORT + '/');
ch.closeFuture().sync();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
}
An WebSocketServerInitializer source code:
public class WebSocketServerInitializer extends ChannelInitializer<SocketChannel>
{
private static final String WEBSOCKET_PATH = "/websocket";
private final SslContext sslCtx;
public WebSocketServerInitializer(SslContext sslCtx) {
this.sslCtx = sslCtx;
}
@Override
public void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline pipeline = ch.pipeline();
pipeline.addLast(sslCtx.newHandler(ch.alloc()));
pipeline.addLast(new HttpServerCodec());
pipeline.addLast(new HttpObjectAggregator(65536));
pipeline.addLast(new WebSocketServerCompressionHandler());
pipeline.addLast(new WebSocketServerProtocolHandler(WEBSOCKET_PATH, null, true));
// pipeline.addLast(new WebSocketIndexPageHandler(WEBSOCKET_PATH));
pipeline.addLast(new WebSocketFrameHandler());
}
}
This is my Html code:
<html>
<head>
<script type="text/javascript">
// Let us open a web socket
var ws = null;
function WebSocketTest()
{
if ("WebSocket" in window)
{
alert("WebSocket is supported by your Browser!");
// Let us open a web socket
ws = new WebSocket("wss://localhost:4466/websocket");
ws.onopen = function()
{
// Web Socket is connected, send data using send()
ws.send("Message to send");
alert("Message is sent...");
};
ws.onmessage = function (evt)
{
var received_msg = evt.data;
alert(received_msg);
//alert("Message is received...");
};
ws.onclose = function()
{
// websocket is closed.
alert("Connection is closed...");
};
window.onbeforeunload = function(event) {
socket.close();
};
}
else
{
// The browser doesn't support WebSocket
alert("WebSocket NOT supported by your Browser!");
}
}
</script>
</head>
<body>
<div id="sse">
<a href="javascript:WebSocketTest()">Run WebSocket</a>
</div>
</body>
</html>
I browse the page using Chrome browser and got the following message when I click on the link in the web page.
WebSocket connection to 'wss://localhost:4466/websocket' failed: Error in connection establishment: net::ERR_INSECURE_RESPONSE
According to some discussions here, and the netty websocket sample code, wss must be forwarded by HTTPS. However, when I change the following javascript statement in my web page:
ws = new WebSocket("wss://localhost:4466/websocket");
to
ws = new WebSocket("wss://echo.websocket.org");
It works fine. It make me confusing, Why the site echo.websocket.org can working without https? Why my server cannot? are there something missing in my server source code?
PS: the echo.websocket.org example found in the following url:
