如何在 Netty 3.3 中配置 WebSockets (RFC 6455)？

Question

我有来自https://github.com/netty/netty/tree/3.2/src/main/java/org/jboss/netty/example/http/websocketx/server 的带有 WebSockets 的 Netty 3.3 服务器

我有实现 RFC 6455 的客户端，但默认情况下服务器无法解码它的消息。在调试时，我看到使用了 WebSocket08FrameDecoder（而不是 WebSocket13FrameDecoder）。当我将客户端降级到 Draft00 时，一切正常。 如何配置 Netty 以解码 RFC 6455 消息？

更新

客户端发送此握手包：

GET /websocket HTTP/1.1
Upgrade: WebSocket
Connection: Upgrade
Sec-WebSocket-Version: 13
Sec-WebSocket-Key: 5a087
Host: 127.0.0.1
Origin: 127.0.0.1

服务器上的握手器是WebSocketServerHandshaker13，但我仍然收到错误：

org.jboss.netty.handler.codec.frame.CorruptedFrameException: unmasked client to server frame
at org.jboss.netty.handler.codec.http.websocketx.WebSocket08FrameDecoder.protocolViolation(WebSocket08FrameDecoder.java:350)
at org.jboss.netty.handler.codec.http.websocketx.WebSocket08FrameDecoder.decode(WebSocket08FrameDecoder.java:138)
at org.jboss.netty.handler.codec.http.websocketx.WebSocket08FrameDecoder.decode(WebSocket08FrameDecoder.java:56)
at org.jboss.netty.handler.codec.replay.ReplayingDecoder.callDecode(ReplayingDecoder.java:465)
at org.jboss.netty.handler.codec.replay.ReplayingDecoder.messageReceived(ReplayingDecoder.java:438)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:343)
at org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:274)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:194)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)`

Answer 1

如果您查看WebSocketServerHandshakerFactory，它会根据 HTTP 标头中传递的 Web 套接字版本实例化解码器。

 public WebSocketServerHandshaker newHandshaker(HttpRequest req) {

    String version = req.getHeader(Names.SEC_WEBSOCKET_VERSION);
    if (version != null) {
        if (version.equals(WebSocketVersion.V13.toHttpHeaderValue())) {
            // Version 13 of the wire protocol - RFC 6455 (version 17 of the draft hybi specification).
            return new WebSocketServerHandshaker13(webSocketURL, subprotocols, allowExtensions);
        } else if (version.equals(WebSocketVersion.V08.toHttpHeaderValue())) {
            // Version 8 of the wire protocol - version 10 of the draft hybi specification.
            return new WebSocketServerHandshaker08(webSocketURL, subprotocols, allowExtensions);
        } else {
            return null;
        }
    } else {
        // Assume version 00 where version header was not specified
        return new WebSocketServerHandshaker00(webSocketURL, subprotocols);
    }
}

请检查您的客户端实现以查看它在 HTTP 标头中发送的版本。应该是Sec-WebSocket-Version: 13。