io.netty.handler.codec.http.websocketx

Class WebSocketServerHandshaker00

java.lang.Object

io.netty.handler.codec.http.websocketx.WebSocketServerHandshaker

io.netty.handler.codec.http.websocketx.WebSocketServerHandshaker00

public class WebSocketServerHandshaker00
extends WebSocketServerHandshaker

Performs server side opening and closing handshakes for web socket specification version draft-ietf-hybi-thewebsocketprotocol- 00

A very large portion of this code was taken from the Netty 3.2 HTTP example.

Field Summary

Fields inherited from class io.netty.handler.codec.http.websocketx.WebSocketServerHandshaker

logger, SUB_PROTOCOL_WILDCARD

Constructor Summary

Constructors

Constructor and Description
WebSocketServerHandshaker00(java.lang.String webSocketURL, java.lang.String subprotocols, int maxFramePayloadLength) Constructor specifying the destination web socket location

Method Summary

Modifier and Type	Method and Description
ChannelFuture	close(Channel channel, CloseWebSocketFrame frame, ChannelPromise promise) Echo back the closing frame
protected FullHttpResponse	newHandshakeResponse(FullHttpRequest req, HttpHeaders headers) Handle the web socket handshake for the web socket specification HyBi version 0 and lower.
protected WebSocketFrameDecoder	newWebsocketDecoder() Returns the decoder to use after handshake is complete.
protected WebSocketFrameEncoder	newWebSocketEncoder() Returns the encoder to use after the handshake is complete.

Methods inherited from class io.netty.handler.codec.http.websocketx.WebSocketServerHandshaker

close, handshake, handshake, handshake, handshake, maxFramePayloadLength, selectedSubprotocol, selectSubprotocol, subprotocols, uri, version

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WebSocketServerHandshaker00

public WebSocketServerHandshaker00(java.lang.String webSocketURL,
                                   java.lang.String subprotocols,
                                   int maxFramePayloadLength)

Constructor specifying the destination web socket location

Parameters:

webSocketURL - URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be sent to this URL.

subprotocols - CSV of supported protocols

maxFramePayloadLength - Maximum allowable frame payload length. Setting this value to your application's requirement may reduce denial of service attacks using long data frames.

Method Detail

newHandshakeResponse

protected FullHttpResponse newHandshakeResponse(FullHttpRequest req,
                                                HttpHeaders headers)

Handle the web socket handshake for the web socket specification HyBi version 0 and lower. This standard is really a rehash of hixie-76 and hixie-75.

Browser request to the server:

 GET /demo HTTP/1.1
 Upgrade: WebSocket
 Connection: Upgrade
 Host: example.com
 Origin: http://example.com
 Sec-WebSocket-Protocol: chat, sample
 Sec-WebSocket-Key1: 4 @1  46546xW%0l 1 5
 Sec-WebSocket-Key2: 12998 5 Y3 1  .P00

 ^n:ds[4U
 

Server response:

 HTTP/1.1 101 WebSocket Protocol Handshake
 Upgrade: WebSocket
 Connection: Upgrade
 Sec-WebSocket-Origin: http://example.com
 Sec-WebSocket-Location: ws://example.com/demo
 Sec-WebSocket-Protocol: sample

 8jKS'y:G*Co,Wxa-
 

Specified by:

newHandshakeResponse in class WebSocketServerHandshaker

close

public ChannelFuture close(Channel channel,
                           CloseWebSocketFrame frame,
                           ChannelPromise promise)

Echo back the closing frame

Overrides:

close in class WebSocketServerHandshaker

Parameters:

channel - Channel

frame - Web Socket frame that was received

promise - the ChannelPromise to be notified when the closing handshake is done

newWebsocketDecoder

protected WebSocketFrameDecoder newWebsocketDecoder()

Description copied from class: WebSocketServerHandshaker

Returns the decoder to use after handshake is complete.

Specified by:

newWebsocketDecoder in class WebSocketServerHandshaker

newWebSocketEncoder

protected WebSocketFrameEncoder newWebSocketEncoder()

Description copied from class: WebSocketServerHandshaker

Returns the encoder to use after the handshake is complete.

Specified by:

newWebSocketEncoder in class WebSocketServerHandshaker