从 1.2.0 开始，getty提供了对websocket的支持。

    getty 基于java aio 对websocket协议进行了封装，对ws wss协议提供了支持

    同样的，getty已经对ws消息做了 粘包/拆包 。使用的时候无需考虑粘包/拆包的问题。 

    1. * version 5+
    2.  * 0                   1                   2                   3
    3.  * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    4.  * +-+-+-+-+-------+-+-------------+-------------------------------+
    5.  * |F|R|R|R| opcode|M| Payload len |    Extended payload length    |
    6.  * |I|S|S|S|  (4)  |A|     (7)     |             (16/64)           |
    7.  * |N|V|V|V|       |S|             |   (if payload len==126/127)   |
    8.  * | |1|2|3|       |K|             |                               |
    9.  * +-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - +
    10.  * |     Extended payload length continued, if payload len == 127  |
    11.  * + - - - - - - - - - - - - - - - +-------------------------------+
    12.  * |                               |Masking-key, if MASK set to 1  |
    13.  * +-------------------------------+-------------------------------+
    14.  * | Masking-key (continued)       |          Payload Data         |
    15.  * +-------------------------------- - - - - - - - - - - - - - - - +
    16.  * :                     Payload Data continued ...                :
    17.  * + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
    18.  * |                     Payload Data continued ...                |
    19.  * +---------------------------------------------------------------+
    20.  * version 1-4
    21.  * 0                   1                   2                   3
    22.  * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    23.  * +-+-+-+-+-------+-+-------------+-------------------------------+
    24.  * |M|R|R|R| opcode|R| Payload len |    Extended payload length    |
    25.  * |O|S|S|S|  (4)  |S|     (7)     |             (16/63)           |
    26.  * |R|V|V|V|       |V|             |   (if payload len==126/127)   |
    27.  * |E|1|2|3|       |4|             |                               |
    28.  * +-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - +
    29.  * |     Extended payload length continued, if payload len == 127  |
    30.  * + - - - - - - - - - - - - - - - +-------------------------------+
    31.  * |                               |         Extension data        |
    32.  * +-------------------------------+ - - - - - - - - - - - - - - - +
    33.  * :                                                               :
    34.  * +---------------------------------------------------------------+
    35.  * :                       Application data                        :
    36.  * +---------------------------------------------------------------+