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  * JBoss, Home of Professional Open Source.
  * Copyright 2012 Red Hat, Inc., and individual contributors
  * as indicated by the @author tags.
  * Licensed 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package io.undertow.websockets.core;

Enum which list all the different versions of the WebSocket specification (to the current date).

A specification is tied to one wire protocol version but a protocol version may have use by more than 1 version of the specification.

Norman Maurer
public enum WebSocketVersion {

Unknown version of the protocol

draft-ietf-hybi-thewebsocketprotocol- 00.

draft-ietf-hybi-thewebsocketprotocol- 07

draft-ietf-hybi-thewebsocketprotocol- 10

RFC 6455. This was originally draft-ietf-hybi-thewebsocketprotocol- 17

Returns a java.lang.String representation of the WebSocketVersion that can be used in the HTTP Headers.
    public String toHttpHeaderValue() {
        if (this == ) {
            return "0";
        if (this == ) {
            return "7";
        if (this == ) {
            return "8";
        if (this == ) {
            return "13";
        // Should never hit here.
        throw new IllegalStateException("Unknown WebSocket version: " + this);
    public static final AttachmentKey<WebSocketVersionATTACHMENT_KEY = AttachmentKey.create(WebSocketVersion.class);
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