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JSR 356:Java API for WebSocket
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package javax.websocket;

import java.util.List;

/**
 * The ClientEndpointConfiguration is a special kind of endpoint configuration object that contains
 * web socket configuration information specific only to client endpoints.
 *
 * @author dannycoward
 * @since DRAFT 001
 */
public interface ClientEndpointConfiguration extends EndpointConfiguration {

    /**
     * The ordered list of sub protocols a client endpoint would like to use, the empty list if there are none.
     * 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 a list of the preferred subprotocols
     */
    List getPreferredSubprotocols();

    /**
     * http://java.net/jira/browse/WEBSOCKET_SPEC-45
     * Return the list of all the extensions that this client supports, the empty list if there are none. 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 a list of extensions
     */
    List getExtensions();

}