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#751 - Added support for legacy websocket v7 in order to pass SocksJS tests

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Veebs 2012-12-14 14:59:18 -08:00 committed by Norman Maurer
parent 78ccfeedf9
commit 92f1a81f47
7 changed files with 575 additions and 0 deletions
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76
codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocket07FrameDecoder.java Normal file
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@ -0,0 +1,76 @@
/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
// (BSD License: http://www.opensource.org/licenses/bsd-license)
//
// Copyright (c) 2011, Joe Walnes and contributors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or
// without modification, are permitted provided that the
// following conditions are met:
//
// * Redistributions of source code must retain the above
// copyright notice, this list of conditions and the
// following disclaimer.
//
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the
// following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// * Neither the name of the Webbit nor the names of
// its contributors may be used to endorse or promote products
// derived from this software without specific prior written
// permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
// CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package io.netty.handler.codec.http.websocketx;
/**
* Decodes a web socket frame from wire protocol version 7 format. V7 is essentially the same as V8.
*/
public class WebSocket07FrameDecoder extends WebSocket08FrameDecoder {
/**
* Constructor
*
* @param maskedPayload
* Web socket servers must set this to true processed incoming masked payload. Client implementations
* must set this to false.
* @param allowExtensions
* Flag to allow reserved extension bits to be used or not
* @param maxFramePayloadLength
* Maximum length of a frame's payload. Setting this to an appropriate value for you application
* helps check for denial of services attacks.
*/
public WebSocket07FrameDecoder(boolean maskedPayload, boolean allowExtensions, int maxFramePayloadLength) {
super(maskedPayload, allowExtensions, maxFramePayloadLength);
}
}

73
codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocket07FrameEncoder.java Normal file
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/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
// (BSD License: http://www.opensource.org/licenses/bsd-license)
//
// Copyright (c) 2011, Joe Walnes and contributors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or
// without modification, are permitted provided that the
// following conditions are met:
//
// * Redistributions of source code must retain the above
// copyright notice, this list of conditions and the
// following disclaimer.
//
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the
// following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// * Neither the name of the Webbit nor the names of
// its contributors may be used to endorse or promote products
// derived from this software without specific prior written
// permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
// CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package io.netty.handler.codec.http.websocketx;
/**
* <p>
* Encodes a web socket frame into wire protocol version 7 format. V7 is essentially the same as V8.
* </p>
*/
public class WebSocket07FrameEncoder extends WebSocket08FrameEncoder {
/**
* Constructor
*
* @param maskPayload
* Web socket clients must set this to true to mask payload. Server implementations must set this to
* false.
*/
public WebSocket07FrameEncoder(boolean maskPayload) {
super(maskPayload);
}
}

230
codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshaker07.java Normal file
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/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.handler.codec.http.websocketx;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.http.DefaultHttpRequest;
import io.netty.handler.codec.http.HttpHeaders.Names;
import io.netty.handler.codec.http.HttpHeaders.Values;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpRequestEncoder;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.HttpResponseDecoder;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpVersion;
import io.netty.logging.InternalLogger;
import io.netty.logging.InternalLoggerFactory;
import io.netty.util.CharsetUtil;
import java.net.URI;
import java.util.Map;
/**
* <p>
* Performs client side opening and closing handshakes for web socket specification version <a
* href="http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-07" >draft-ietf-hybi-thewebsocketprotocol-
* 10</a>
* </p>
*/
public class WebSocketClientHandshaker07 extends WebSocketClientHandshaker {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(WebSocketClientHandshaker07.class);
public static final String MAGIC_GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
private String expectedChallengeResponseString;
private final boolean allowExtensions;
/**
* Creates a new instance.
*
* @param webSocketURL
* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
* sent to this URL.
* @param version
* Version of web socket specification to use to connect to the server
* @param subprotocol
* Sub protocol request sent to the server.
* @param allowExtensions
* Allow extensions to be used in the reserved bits of the web socket frame
* @param customHeaders
* Map of custom headers to add to the client request
* @param maxFramePayloadLength
* Maximum length of a frame's payload
*/
public WebSocketClientHandshaker07(URI webSocketURL, WebSocketVersion version, String subprotocol,
boolean allowExtensions, Map<String, String> customHeaders, int maxFramePayloadLength) {
super(webSocketURL, version, subprotocol, customHeaders, maxFramePayloadLength);
this.allowExtensions = allowExtensions;
}
/**
* /**
* <p>
* Sends the opening request to the server:
* </p>
*
* <pre>
* GET /chat HTTP/1.1
* Host: server.example.com
* Upgrade: websocket
* Connection: Upgrade
* Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
* Sec-WebSocket-Origin: http://example.com
* Sec-WebSocket-Protocol: chat, superchat
* Sec-WebSocket-Version: 7
* </pre>
*
* @param channel
* Channel into which we can write our request
*/
@Override
public ChannelFuture handshake(Channel channel, final ChannelFuture handshakeFuture) {
// Get path
URI wsURL = getWebSocketUrl();
String path = wsURL.getPath();
if (wsURL.getQuery() != null && !wsURL.getQuery().isEmpty()) {
path = wsURL.getPath() + '?' + wsURL.getQuery();
}
if (path == null || path.isEmpty()) {
path = "/";
}
// Get 16 bit nonce and base 64 encode it
byte[] nonce = WebSocketUtil.randomBytes(16);
String key = WebSocketUtil.base64(nonce);
String acceptSeed = key + MAGIC_GUID;
byte[] sha1 = WebSocketUtil.sha1(acceptSeed.getBytes(CharsetUtil.US_ASCII));
expectedChallengeResponseString = WebSocketUtil.base64(sha1);
if (logger.isDebugEnabled()) {
logger.debug(String.format("WS Version 07 Client Handshake key: %s. Expected response: %s.", key,
expectedChallengeResponseString));
}
// Format request
HttpRequest request = new DefaultHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, path);
request.addHeader(Names.UPGRADE, Values.WEBSOCKET.toLowerCase());
request.addHeader(Names.CONNECTION, Values.UPGRADE);
request.addHeader(Names.SEC_WEBSOCKET_KEY, key);
request.addHeader(Names.HOST, wsURL.getHost());
int wsPort = wsURL.getPort();
String originValue = "http://" + wsURL.getHost();
if (wsPort != 80 && wsPort != 443) {
// if the port is not standard (80/443) its needed to add the port to the header.
// See http://tools.ietf.org/html/rfc6454#section-6.2
originValue = originValue + ':' + wsPort;
}
request.addHeader(Names.SEC_WEBSOCKET_ORIGIN, originValue);
String expectedSubprotocol = getExpectedSubprotocol();
if (expectedSubprotocol != null && !expectedSubprotocol.isEmpty()) {
request.addHeader(Names.SEC_WEBSOCKET_PROTOCOL, expectedSubprotocol);
}
request.addHeader(Names.SEC_WEBSOCKET_VERSION, "7");
if (customHeaders != null) {
for (Map.Entry<String, String> e : customHeaders.entrySet()) {
request.addHeader(e.getKey(), e.getValue());
}
}
ChannelFuture future = channel.write(request);
future.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) {
ChannelPipeline p = future.channel().pipeline();
p.addAfter(
p.context(HttpRequestEncoder.class).name(),
"ws-encoder", new WebSocket07FrameEncoder(true));
if (future.isSuccess()) {
handshakeFuture.setSuccess();
} else {
handshakeFuture.setFailure(future.cause());
}
}
});
return handshakeFuture;
}
/**
* <p>
* Process server response:
* </p>
*
* <pre>
* HTTP/1.1 101 Switching Protocols
* Upgrade: websocket
* Connection: Upgrade
* Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=
* Sec-WebSocket-Protocol: chat
* </pre>
*
* @param channel
* Channel
* @param response
* HTTP response returned from the server for the request sent by beginOpeningHandshake00().
* @throws WebSocketHandshakeException
*/
@Override
public void finishHandshake(Channel channel, HttpResponse response) {
final HttpResponseStatus status = HttpResponseStatus.SWITCHING_PROTOCOLS;
if (!response.getStatus().equals(status)) {
throw new WebSocketHandshakeException("Invalid handshake response status: " + response.getStatus());
}
String upgrade = response.getHeader(Names.UPGRADE);
if (!Values.WEBSOCKET.equalsIgnoreCase(upgrade)) {
throw new WebSocketHandshakeException("Invalid handshake response upgrade: "
+ response.getHeader(Names.UPGRADE));
}
String connection = response.getHeader(Names.CONNECTION);
if (!Values.UPGRADE.equalsIgnoreCase(connection)) {
throw new WebSocketHandshakeException("Invalid handshake response connection: "
+ response.getHeader(Names.CONNECTION));
}
String accept = response.getHeader(Names.SEC_WEBSOCKET_ACCEPT);
if (accept == null || !accept.equals(expectedChallengeResponseString)) {
throw new WebSocketHandshakeException(String.format("Invalid challenge. Actual: %s. Expected: %s", accept,
expectedChallengeResponseString));
}
String subprotocol = response.getHeader(Names.SEC_WEBSOCKET_PROTOCOL);
setActualSubprotocol(subprotocol);
setHandshakeComplete();
ChannelPipeline p = channel.pipeline();
p.remove(HttpRequestEncoder.class);
p.get(HttpResponseDecoder.class).replace(
"ws-decoder",
new WebSocket07FrameDecoder(false, allowExtensions, getMaxFramePayloadLength()));
}
}

4
codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshakerFactory.java
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@ -81,6 +81,10 @@ public final class WebSocketClientHandshakerFactory {
return new WebSocketClientHandshaker08( return new WebSocketClientHandshaker08(
webSocketURL, V08, subprotocol, allowExtensions, customHeaders, maxFramePayloadLength); webSocketURL, V08, subprotocol, allowExtensions, customHeaders, maxFramePayloadLength);
} }
if (version == V07) {
return new WebSocketClientHandshaker07(
webSocketURL, V07, subprotocol, allowExtensions, customHeaders, maxFramePayloadLength);
}
if (version == V00) { if (version == V00) {
return new WebSocketClientHandshaker00( return new WebSocketClientHandshaker00(
webSocketURL, V00, subprotocol, customHeaders, maxFramePayloadLength); webSocketURL, V00, subprotocol, customHeaders, maxFramePayloadLength);

179
codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketServerHandshaker07.java Normal file
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@ -0,0 +1,179 @@
/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.handler.codec.http.websocketx;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.http.DefaultHttpResponse;
import io.netty.handler.codec.http.HttpChunkAggregator;
import io.netty.handler.codec.http.HttpHeaders.Names;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.HttpResponseEncoder;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.logging.InternalLogger;
import io.netty.logging.InternalLoggerFactory;
import io.netty.util.CharsetUtil;
import static io.netty.handler.codec.http.HttpHeaders.Values.*;
import static io.netty.handler.codec.http.HttpVersion.*;
/**
* <p>
* Performs server side opening and closing handshakes for web socket specification version <a
* href="http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-10" >draft-ietf-hybi-thewebsocketprotocol-
* 10</a>
* </p>
*/
public class WebSocketServerHandshaker07 extends WebSocketServerHandshaker {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(WebSocketServerHandshaker07.class);
public static final String WEBSOCKET_07_ACCEPT_GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
private final boolean allowExtensions;
/**
* Constructor specifying the destination web socket location
*
* @param webSocketURL
* URL for web socket communications. e.g "ws://myhost.com/mypath".
* Subsequent web socket frames will be sent to this URL.
* @param subprotocols
* CSV of supported protocols
* @param allowExtensions
* Allow extensions to be used in the reserved bits of the web socket frame
* @param maxFramePayloadLength
* Maximum allowable frame payload length. Setting this value to your application's
* requirement may reduce denial of service attacks using long data frames.
*/
public WebSocketServerHandshaker07(
String webSocketURL, String subprotocols, boolean allowExtensions, int maxFramePayloadLength) {
super(WebSocketVersion.V07, webSocketURL, subprotocols, maxFramePayloadLength);
this.allowExtensions = allowExtensions;
}
/**
* <p>
* Handle the web socket handshake for the web socket specification <a href=
* "http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-07">HyBi version 7</a>.
* </p>
*
* <p>
* Browser request to the server:
* </p>
*
* <pre>
* GET /chat HTTP/1.1
* Host: server.example.com
* Upgrade: websocket
* Connection: Upgrade
* Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
* Sec-WebSocket-Origin: http://example.com
* Sec-WebSocket-Protocol: chat, superchat
* Sec-WebSocket-Version: 7
* </pre>
*
* <p>
* Server response:
* </p>
*
* <pre>
* HTTP/1.1 101 Switching Protocols
* Upgrade: websocket
* Connection: Upgrade
* Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=
* Sec-WebSocket-Protocol: chat
* </pre>
*
* @param channel
* Channel
* @param req
* HTTP request
*/
@Override
public ChannelFuture handshake(Channel channel, HttpRequest req, ChannelFuture future) {
if (logger.isDebugEnabled()) {
logger.debug(String.format("Channel %s WS Version 7 server handshake", channel.id()));
}
HttpResponse res = new DefaultHttpResponse(HTTP_1_1, HttpResponseStatus.SWITCHING_PROTOCOLS);
String key = req.getHeader(Names.SEC_WEBSOCKET_KEY);
if (key == null) {
throw new WebSocketHandshakeException("not a WebSocket request: missing key");
}
String acceptSeed = key + WEBSOCKET_07_ACCEPT_GUID;
byte[] sha1 = WebSocketUtil.sha1(acceptSeed.getBytes(CharsetUtil.US_ASCII));
String accept = WebSocketUtil.base64(sha1);
if (logger.isDebugEnabled()) {
logger.debug(String.format("WS Version 7 Server Handshake key: %s. Response: %s.", key, accept));
}
res.setStatus(HttpResponseStatus.SWITCHING_PROTOCOLS);
res.addHeader(Names.UPGRADE, WEBSOCKET.toLowerCase());
res.addHeader(Names.CONNECTION, Names.UPGRADE);
res.addHeader(Names.SEC_WEBSOCKET_ACCEPT, accept);
String subprotocols = req.getHeader(Names.SEC_WEBSOCKET_PROTOCOL);
if (subprotocols != null) {
String selectedSubprotocol = selectSubprotocol(subprotocols);
if (selectedSubprotocol == null) {
throw new WebSocketHandshakeException("Requested subprotocol(s) not supported: " + subprotocols);
} else {
res.addHeader(Names.SEC_WEBSOCKET_PROTOCOL, selectedSubprotocol);
setSelectedSubprotocol(selectedSubprotocol);
}
}
channel.write(res, future);
// Upgrade the connection and send the handshake response.
future.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) {
ChannelPipeline p = future.channel().pipeline();
if (p.get(HttpChunkAggregator.class) != null) {
p.remove(HttpChunkAggregator.class);
}
p.get(HttpRequestDecoder.class).replace("wsdecoder",
new WebSocket07FrameDecoder(true, allowExtensions, getMaxFramePayloadLength()));
p.replace(HttpResponseEncoder.class, "wsencoder", new WebSocket07FrameEncoder(false));
}
});
return future;
}
/**
* Echo back the closing frame and close the connection
*
* @param channel
* Channel
* @param frame
* Web Socket frame that was received
*/
@Override
public ChannelFuture close(Channel channel, CloseWebSocketFrame frame, ChannelFuture future) {
future.addListener(ChannelFutureListener.CLOSE);
return channel.write(frame, future);
}
}

4
codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketServerHandshakerFactory.java
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@ -93,6 +93,10 @@ public class WebSocketServerHandshakerFactory {
// Version 8 of the wire protocol - version 10 of the draft hybi specification. // Version 8 of the wire protocol - version 10 of the draft hybi specification.
return new WebSocketServerHandshaker08( return new WebSocketServerHandshaker08(
webSocketURL, subprotocols, allowExtensions, maxFramePayloadLength); webSocketURL, subprotocols, allowExtensions, maxFramePayloadLength);
} else if (version.equals(WebSocketVersion.V07.toHttpHeaderValue())) {
// Version 8 of the wire protocol - version 07 of the draft hybi specification.
return new WebSocketServerHandshaker07(
webSocketURL, subprotocols, allowExtensions, maxFramePayloadLength);
} else { } else {
return null; return null;
} }

9
codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketVersion.java
View File

@ -33,6 +33,12 @@ public enum WebSocketVersion {
*/ */
V00, V00,
/**
* <a href= "http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-07"
* >draft-ietf-hybi-thewebsocketprotocol- 07</a>
*/
V07,
/** /**
* <a href= "http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-10" * <a href= "http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-10"
* >draft-ietf-hybi-thewebsocketprotocol- 10</a> * >draft-ietf-hybi-thewebsocketprotocol- 10</a>
@ -53,6 +59,9 @@ public enum WebSocketVersion {
if (this == V00) { if (this == V00) {
return "0"; return "0";
} }
if (this == V07) {
return "7";
}
if (this == V08) { if (this == V08) {
return "8"; return "8";
} }