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/*
 * Copyright 2014 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.extensions;


/**
 * Handshakes a client extension based on this server capabilities.
 */
public interface WebSocketServerExtensionHandshaker {

    /**
     * Handshake based on client request. It must failed with null if server cannot handle it.
     *
     * @param extensionData
     *          the extension configuration sent by the client.
     * @return an initialized extension if handshake phase succeed or null if failed.
     */
    WebSocketServerExtension handshakeExtension(WebSocketExtensionData extensionData);

}




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