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JSR 356: Java API for WebSocket
There is a newer version: 1.1
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package javax.websocket;

import java.util.List;
import java.util.Map;

/**
 * The ClientEndpointConfiguration is a special kind of endpoint configuration object that contains
 * web socket configuration information specific only to client endpoints. Developers deploying 
 * programmatic client endpoints can create instances of this configuration by
 * using a {@link ClientEndpointConfigurationBuilder}. 
 *
 * @author dannycoward
 * @since DRAFT 001
 */
public interface ClientEndpointConfiguration extends EndpointConfiguration {


    /**
     * Return the ordered list of sub protocols a client endpoint would like to use,
     * in order of preference, favorite first that this client would
     * like to use for its sessions.
     * This list is used to generate the Sec-WebSocket-Protocol header in the opening
     * handshake for clients using this configuration. The first protocol name is the most preferred.
     * See Client Opening Handshake.
     *
     * @return the list of the preferred subprotocols, the empty list if there are none
     */
    List getPreferredSubprotocols();

    /**
     * Return the extensions, in order of preference, favorite first, that this client would
     * like to use for its sessions. These are the extensions that will
     * be used to populate the Sec-WebSocket-Extensions header in the opening handshake for clients
     * using this configuration. The first extension in the list is the most preferred extension.
     * See Negotiating Extensions.
     *
     * @return the list of extensions, the empty list if there are none.
     */
    List getExtensions();
    
    
    /**
     * Return the custom configurator for this configuration. If the developer
     * did not provide one, the platform default configurator is returned.
     * 
     * @return the configurator in use with this configuration.
     */
    public ClientEndpointConfigurator getClientEndpointConfigurator();




}